POWERBOR PB70 User manual

PB70 - W18XC1052 - Revised 040113
The POWERBOR range of machines are exclusively manufactured by
G&J Hall Ltd, Burgess Road, Sheffield, S9 3WD, England
POWERBOR - PB70 DRILL
ORIGINAL INSTRUCTIONS
WARNING !
When using electric power tools basic safety
precautions should always be used to
reduce the risk of fire, electric shock and
personal injury.
Read all of these instructions before
attempting to operate this product and save
these instructions
Machine shown
PB70 - without the
safety guard for clarity.

2PB70 - W18XC1052 - Revised 040113
PAGE INDEX Page No.
Machine Specification 3
Explanation of symbols used 4
Intended use of power tool 5
Prohibited use of power tool 5
Safety precautions
1 - Precautions and use of PPE. 6
2 - Special safety precautions - Magnetic Drills. 7
3 - Electrical safety 8
4 - Dust Extraction 8
5 - General safety instructions. 9-10
Installation instructions
1 - Unpacking and Assembly 11
2 - Setting-up or fixing tool in a stable position. 11
3 - Connection to power supply. 11
4 - Illustrated description of functions 12
5 - Limitations on ambient conditions 13
6 - Standard Accessories 13
7 - Disassembly and transportation 13
Operating instructions
1 - Setting and testing. 14
2 - Tool changing - Mounting of cutters into the arbor. 14
Fitting the MT3 arbor. 15
Removing the MT3 arbor. 15
Using Twist Drills. 15
3 - Guards 16
4 - Clamping of work. (Magnet Control) 16
5 - Limits on size of work piece and type of material.
Cutting Speeds/Materials—HSS cutters 17
Workpiece Material and size Limitations 17
6 - General instructions for use.
Drill unit spindle - start / stop - gear selection 18
Drill unit speed control - torque boost - spindle direction 19
Tapping 20-21
Reversing of the handles 22
Normal operator position 22
Using the drill with annular cutters 23
Motor Protection 24
Coolant 24
7 - Lifting handles/transportation. 5
Maintenance and servicing
1 - Regular cleaning, maintenance and lubrication. 25
2 - Servicing by manufacturer. 26
3 - Special Tools 13
4 - Blockages of chips or work piece fragments. 23

3PB70 - W18XC1052 - Revised 040113
MACHINE SPECIFICATION
PB70
Machine Height 440mm (slide in down position)
Machine Width 160mm (without handles)
Machine Depth 330mm
Stroke 190mm
Machine Weight 22.0kg (tool and detachable parts)
Rated Motor Power 1800W
Voltage 110V / 230V AC
Rated Current 17.8A / 8.7A
IP Rating IP20
Spindle Speed - load 60 - 140 / 200 - 470 /min(with load feedback compensation)
Spindle Speed - n060 - 140 / 200 - 470 /min
No. of speeds 2 Gears
FWD/REV Yes
Power Cord Length 2.5m
Insulation Class CLASS I
Annular Cutter Capacity Ø70mm (needs optional 1-1/4” arbor above Ø65mm)
Standard Cutting Depth 50mm
Twist Drill Capacity Ø32mm with MT3 shank
Tapping Capacity M6 - M24
Countersink Yes
Chuck Type 3/4” Weldon Shank Arbor or MT3
Spindle Fitting MT3
Magnet Dimensions 200mm x 100mm
Magnet Power 75W
Magnetic Adhesion 1500kg (measured on 25mm thick plate)
Minimum Plate Thickness 12mm (minimum recommended)
Sound Pressure Level 86 dBA Uncertainty 3 dBA
Sound Power Level 99 dBA Uncertainty 3 dBA
SPL at Operators Head 89 dBA (1.55m high x 1m distance) Uncertainty 3 dBA
Hand-arm Vibration Less than 2.5 m/s2 Uncertainty 1.5m/s2.
The vibration measurement was made under standard conditions in accordance with the
requirements of BS EN 60129-1:2009.
The actual vibration level during use will depend on the workpiece stability/rigidity and the
condition of the cutter used. These factors may increase the vibration experienced by the
operator, each individual application of the tool should be assessed for the effect of these
application variable factors, before exposure.
.

4PB70 - W18XC1052 - Revised 040113
Symbol Meaning
Eye protection should be worn at all times when using
this tool.
Hard Hat—Head protection should be worn at all times
whilst using this tool, to protect from overhead hazards
Ear protection / Ear defenders should be worn at all
times whilst using this tool, this tool exceed 85dB(A)
Electrical enclosure - risk of electric shock.
Read and understand the instruction manual - before
operating this tool.
Caution ! / Attention !
Instruction Manual
WEEE - Waste of Electrical and Electronic Equipment
This tool should be disposed of as Electrical &
Electronic Waste.
EXPLANATION OF SYMBOLS USED

5PB70 - W18XC1052 - Revised 040113
INTENDED OF USE OF POWER TOOL
This power tool is intended to be used for drilling holes with annular cutters, twist drills,
counterbores, countersinks and step drills in an industrial environment.
The machine is meant to be held onto a magnetisable surface using its electro-magnetic
base.
The power tool should be used in a weather protected environment and be used with the
accessories provided or Powerbor recommended accessories only.
The power tool can be used vertically, horizontally and upside down, provided the
magnetic adhesion and work environment allow.
Cutting paste should be used rather than cutting fluid when using the machine in the
upside down position to prevent ingress of fluids into the electrical system.
PROHIBITED USE OF POWER TOOL
This power tool should NEVER be used without a ground or protective earth connection.
This power tool should NOT be used in a potentially explosive environment.
This power tool should NOT be use in a wet or humid environment where water could be
drawn into the power tools cooling and ventilation system.
If the power tool is used in the upside down position, cutting fluids should not be used to
prevent ingress of fluids into the electrical system, cutting paste should be used instead.
This power tool should never be positioned on a workpiece between the electrode and
ground of an arc type welder. Damage to the machine will result as the welder will ground
through the power tools ground or earth cable.
This power tool should not be used where the voltage is abnormally lower than the rated
voltage, subject to voltage tolerances. Check the power tool rating plate, check the
voltage available.
Operating on a lower than rated voltage will result in the electro magnet being at reduced
power and the machine may become insecure whilst drilling.


LIFTING HANDLES - TRANSPORTATION
When lifting the tool
the lifting handles shown
in the diagram on the
right should be used.
The drill unit should be
lowered to its lowest
position for improved
stability.
Under no circumstances
should the motor cable
be used for lifting the
power tool.

6PB70 - W18XC1052 - Revised 040113
PERSONAL SAFETY AND USE OF PPE carry the power tool properly with the carrying
Attention
Always watch what you are doing and use common sense at all times when operating
power tools.
Do not use the power tool whilst tired, or under the influence of drugs, alcohol or
medication.
A moment of inattention when using a power tool may result in personal injury.
Clothing
Always dress appropriately, do not wear loose clothing or jewellery.
Contain long hair, keep your hair, clothing and gloves away from any moving parts.
Loose clothes, jewellery or long hair can be caught in moving parts.
Accidental Start-up
Be sure all switches are in their OFF positions before plugging in the machine.
When carrying or moving tools always keep your fingers away from the switches
Plugging in a power tool with the switches in the ON position could invite accidents.
Intentional Start-up
Before starting up the power tool always remove any adjusting keys or tools.
A wrench key left in a rotating part of the power tool may result in injury.
Over Reaching
Never over reach when using a power tool. Always ensure you have a proper stable
footing and balance at all times before operating the tool.
Proper footing and balance enables better control of the tool in case of unexpected
situations.
Personal Protective Equipment
Always wear eye protection.
Always wear ear protection.
Always wear head protection.
Always wear non-skid safety shoes.
Where appropriate wear a dust mask and gloves depending on the working environment.
WORK IN A SAFE MANNER AT ALL TIMES

7PB70 - W18XC1052 - Revised 040113
SPECIAL SAFETY PRECAUTIONS - MAGNETIC DRILLS properly with the carrying
Safety Strap
The electro-magnet base on this power tool can release if there is a interruption in power
supply or electrical malfunction.
The safety strap provided should be used at all times to prevent the power tool from
falling in the event of power failure or electrical malfunction, possibly causing injury.
The safety ratchet strap should be attached to the fixing points provided and checked for
security before commencing any drilling operation.
Magnetic Adhesion
The magnets strength depends on the thickness and condition of the work piece material.
Always ensure that the work piece has a minimum thickness of 12mm or 1/2” to ensure
there is adequate magnetic adhesion.
If the work piece is less than 12mm or 1/2” then a piece of steel plate 12mm or 1/2” in
thickness and larger than the magnet footprint must be inserted to supplement the
magnetic adhesion.
The surface on which the magnet is placed should be clean, flat and clear from debris or
rust. The base of the magnet should be inspected to ensure it is also clean flat and clear
of debris.
Always check the magnet is securely adhered to the work piece before commencing any
drill operations.
Do not use other appliances on the same power receptacle, any variation in voltage
cause by other appliances could result in the magnet releasing. Always us the tool on its
own power receptacle.
This power tool can be used on a vertical surface or upside down provided there is
sufficient magnetic adhesion, extra care should be taken when drilling vertically or upside
down . When using the machine vertically or upside down it is possible hot and sharp
swarf or chips may fall. Always wear appropriate personal protective equipment
When Cutting
When using coolant of lubricants, ensure coolants and lubricants do not enter the drill
units ventilation/cooling openings.
If the drill is used in the upside down position, use cutting paste instead of cutting fluid to
prevent the possibility of fluids entering the electrical system.
When using annular cutters ensure that the slug ejected at the end of the cut will not
endanger anyone in the vicinity, if working at height some form of collection device for the
ejected slug may be necessary.
Care should be taken with the ejected slug, this will be both hot and sharp, gloves should
be worn when handling the slug.

8PB70 - W18XC1052 - Revised 040113
.
ELECTRICAL SAFETYAlways carry the power tool properly with the carrying handles
Earthing / Grounding.
This power tool requires a ground or earth connection.
The power tool must be plugged into an outlet properly installed and grounded or earthed
in accordance with all local codes and regulations.
Never remove or tamper with the ground or earth prong in any way.
Do not use adaptor plugs.
If the tool should electrically malfunction or breakdown, grounding or earthing will provide
a low resistance patch to carry harmful electricity away from the user.
Power Cord
Never carry the power tool by its power cord or electrical hose.
Keep power cords away from heat, oil and sharp edges.
Never pull the power cord to disconnect it from the receptacle.
Always carry the power tool properly with the carrying handles provided.
Periodically inspect the power cord for damage,
If any damage is found the power tool should not be used until the damage has been
repaired by a qualified electrician.
A damaged power cord will increase the risk of electric shock.
Using the Power Tool Outside
Do not expose the power tool to rain or wet conditions, water entering the power tool will
increase the risk of electric shock.
When operating the power tools outside, if required, an extension cord rated for outdoor
use should be used.
These extension cords are rated for outdoor use and reduce the risk of electric shock.
Electrical Enclosure
The electrical components on this power tool are housed within the main body casting,
this and the side panels of the main body create an electrical enclosure.
The panels should not be removed except by a suitable trained or qualified electrician.
DUST EXTRACTION
This tool is intended for drill holes in ferrous metals, if using on materials such as cast
iron where dust might be created, suitable dust extraction should be used.
This is both to protect the operator and to protect the motor inlet from ingress of harmful
dust particles.
Operators should wear suitable dust masks if dust is created whilst working.

9PB70 - W18XC1052 - Revised 040113
1 - Keep work area clear
Cluttered areas and benches invite injuries.
2 - Consider work area environment
Do not expose tools to rain.
Do not use tools in damp or wet locations.
Keep work area well lit.
Do not use tools in the presence of flammable liquids or gases.
3 - Guard against electric shock
Avoid body contact with earthed or grounded surfaces
(e.g. pipes, radiators, ranges, refrigerators).
4 - Keep other persons away
Do not let persons, especially children, not involved in the work touch the tool or the
extension cord and keep them away from the work area.
5 - Store idle tools
When not in use, tools should be stored in a dry locked-up place, out of reach of
children.
6 - Do not force the tool
It will do the job better and safer at the rate for which it was intended.
7 - Use the right tool
Do not force small tools to do the job of a heavy duty tool.
Do not use tools for purposes not intended; for example do not use circular saws to
cut tree limbs or logs.
8 - Dress properly
Do not wear loose clothing or jewellery, they can be caught in moving parts.
Non-skid footwear is recommended when working outdoors.
Wear protective hair covering to contain long hair.
9 - Use protective equipment
Use safety glasses.
Use face or dust mask if working operations create dust.
10 - Connect dust extraction equipment
If the tool is provided for the connection of dust extraction and collecting equipment,
ensure these are connected and properly used.
11 - Do not abuse the cord
Never yank the cord to disconnect it from the socket. Keep the cord away from heat,
oil and sharp edges.
.
12 - Secure work
Where possible use clamps or a vice to hold the work. It is safer than using your
hand.
13 - Do not overreach
Keep proper footing and balance at all times.
GENERAL SAFETY

10 PB70 - W18XC1052 - Revised 040113
14 - Maintain tools with care
Keep cutting tools sharp and clean for better and safer performance.
Follow instruction for lubricating and changing accessories.
Inspect tool cords periodically and if damaged have them repaired by an authorized
service facility.
Inspect extension cords periodically and replace if damaged. Keep handles dry,
clean and free from oil and grease
.
15 - Disconnect tools
When not in use, before servicing and when changing accessories such as blades,
bits and cutters, disconnect tools from the power supply.
16 - Remove adjusting keys and wrenches
Form the habit of checking to see that keys and adjusting wrenches are removed
from the tool before turning it on.
17 - Avoid unintentional starting
Ensure switch is in "off" position when plugging in.
18 - Use outdoor extension leads
When the tool is used outdoors, use only extension cords intended for outdoor use
and so marked.
19 - Stay alert
Watch what you are doing, use common sense and do not operate the tool when
you are tired.
20 - Check damaged parts
Before further use of tool, it should be carefully checked to determine that it will
operate properly and perform its intended function.
Check for alignment of moving parts, binding of moving parts, breakage of parts,
mounting and any other conditions that may affect its operation.
A guard or other part that is damaged should be properly repaired or replaced by an
authorized service centre unless otherwise indicated in this instruction manual.
Have defective switches replaced by an authorized service centre.
Do not use the tool if the switch does not turn it on and off.
21 - Warning
The use of any accessory or attachment other than one recommended in this
instruction manual may present a risk of personal injury.
22 - Have your tool repaired by a qualified person
This electric tool complies with the relevant safety rules. Repairs should only be
carried out by qualified persons using original spare parts, otherwise this may result
in considerable danger to the user.
GENERAL SAFETY - CONT.

11 PB70 - W18XC1052 - Revised 040113
UNPACKING AND ASSEMBLY
The Powerbor PB70 comes in a rugged blow moulded carrying case
Before first use:-
1. Remove the machine from the carrying case. (Note:- 22kg weight)
2. Fit the three screw in handles to the pinion shaft.
3. Fit the safety guard as shown in the instructions, see “Using the safety guard”
4. Fit the arbor, as detailed in the instructions under “Fitting the MT3 Arbor”
SETTING UP THE TOOL
Before using the tool please ensure you have read the sections on the intended and
prohibited of use of the machine.
The machine should only be used for hole drilling whilst attached to the work piece by the
electro-magnetic base.
This machine is intended for use at any angle, but only if the electro-magnet is in full
working order and has sufficient hold on the work piece material.
The safety strap should be attached in case of power failure or machine malfunction.
The safety strap should NOT be used as an alternative to the magnet for clamping
purposes.
Always ensure the strap is correctly fitted and the machine is secure BEFORE starting
CONNECTION TO THE POWER SUPPLY
Connection to the power supply is by 2.5m cable and plug.
For the 230V machine this is by a 3 pin plug with earth connection.
For the 110V machine this is via a CEE type 2pin+earth plug.
The BS1363 plug version is fused, the European Schuko type plug is not fused.
This tool is CLASS I insulation and MUST be earthed, any power socket the tool is
connected to must have an earth.
Before the power cord is connected the magnet switch should be in the OFF position.
The power cord assembly is a custom terminated one, replacement should only be car-
ried out by a qualified electrician. Only use the replacement parts listed below.
Power cord part numbers:-
230V ~ BS Plug 18X503
230V ~ EU Plug 18X503/EU (Shuko / VDE)
230V ~ AU Plug 18X503/AU
110V ~ 2P+E 18Y181
For connection information, should the power cord need to be replaced, please refer to
the wiring diagram in this manual or the connection label inside the rear panel of the
power tool.

12 PB70 - W18XC1052 - Revised 040113
PB70 RAISED PB70 LOWERED
ILLUSTRATED DESCRIPTION OF FUNCTIONS
ELECTRO - MAGNET BASE
‘D’ LOOPS
FOR SAFETY STRAP
2A FUSE (MAGNET)
MAGNET ON/OFF SWITCH
MOTOR SPEED ADJUST
MOTOR ON/OFF SWITCH
PINION SHAFT
HANDLE x 3
GEAR SELECTOR
SAFETY GUARD
ARBOR
DRILL UNIT/MOTOR
MOTOR TORQUE BOOST
SPINDLE FWD/REV SWITCH

13 PB70 - W18XC1052 - Revised 040113
LIMITATIONS ON AMBIENT CONDITIONS
This power tool is has an ingress protection rating of IP20, it should not be used in dusty
or damp environments.
The power tool should be used in a weather protected environment.
Precautions should be taken to ensure dust does not enter the ventilation system of the
power tool causing clogging and overheating.
Power tools produce sparks that may ignite flammable substances such as gases,
flammable liquids or dust.
Do not operate this power tool in a potentially explosive environment.
Ambient temperatures of >45°C should be avoided.
DISASSEMBLY & TRANSPORTATION
When the machine is not in use it should be stored in the carrying case provided.
Any cutters should be removed after use.
The drill unit should be wound down into a low position.
The three pinion handles need to be removed before placing the tool in the case.
Any additional tools or accessories should be stored in the case.
Make sure the case is securely closed and latches are secure before lifting the carrying
case.
The PB70 is supplied in a rugged carrying case with the following as standard :-
MT3 to 3/4” Weldon shank arbor (50mm cut depth)
Safety ratchet strap
Safety guard
250ml bottle & nozzle - provided for use with coolant.
Allen key set
Drill drift
STANDARD ACCESSORIES
SPECIAL TOOLS
All tools required for the safe operation and maintenance of this power tools are provided
within the standard accessories, no additional tools should be required.

14 PB70 - W18XC1052 - Revised 040113
SETTING AND TESTING - USING THE SAFETY STRAP carry the power tool properly
A ratchet type safety strap is provided.
The power tool has 2 x ‘D’ loop rings to allow
the hooks on the safety strap to be attached
securely.
Always ensure the strap is correctly fitted and
the machine is secure BEFORE starting the
motor unit.
The safety strap is used to reduce the risk of
injury in the case of a power supply or
electrical malfunction.
The strap will hold the power tool if the
electro-magnet looses its magnetic adhesion.
If the strap becomes damaged or lost, it must
be replaced BEFORE using the power tool.
DO NOT use the safety strap as an
alternative clamping method, the
electro-magnet should have good magnetic
adhesion at all times whilst using this power
tool.
‘D’LOOP
RATCHET
STRAP
The holder for the cutting tool is known as the
arbor. The arbor is designed to accept
Powerbor 3/4” Weldon shank annular cutters.
For cutters above 65mm diameter a larger
1-1/4” arbor is required. (Part No.18Y105/A)
The Powerbor annular cutters normally have
two flats disposed at 90°to each other.
To mount the cutter.
First ensure the ejector pin is in place.
Align the flats with the two fixing screws.
Push the cutter up into the arbor until it stops.
Tighten the two fixing screws onto the cutter
flats with the hex keys supplied.
MOUNTING CUTTERS INTO THE ARBOR

15 PB70 - W18XC1052 - Revised 040113
REMOVING THE MT3 ARBOR tool prop-
Ensure the machine is turned OFF.
To remove the arbor (A), so that other tools or
tool holders can be fitted into the MT3 socket,
use the drill drift (B) supplied.
Locate the slot on the side of the gearbox,
turn the spindle by hand so that the spindle
slot is in alignment with the gearbox housing
slot.
Slide the drill drift through the slot, as shown
in the diagram opposite. Tap the drill drift
where indicated on the diagram whilst
supporting the arbor.
When the arbor is free of the taper it can be
withdrawn from below.
B
A
FITTING THE MT3 ARBORr tool properly
To fit the MT3 arbor (A) into the machine.
First ensure that both the arbor and the
morse taper socket are clean and free of dirt
or debris and have no damage which could
prevent the taper from seating correctly.
It may be necessary to turn on the magnet
to hold the machine in position. Push the
arbor into the spindle and then tap it home
firmly, preferably with a copper mallet.
Check the security of the arbor before use.
A
USING TWIST DRILLSry the power tool
With the Weldon shank arbor removed, the
electro-magnetic drill stand can be used
with twist drills or any other suitable cutting
tool or holder with a standard MT3 shank.
The PB70 has a twist drill
capacity of Ø32mm.
For smaller twist drills a 5/8” 3 jaw chuck
mounted on an MT3 shank can be used.
(5/8” MT3 Drill Chuck - Part No. 18Y109)

16 PB70 - W18XC1052 - Revised 040113
SAFETY GUARD carry the power
A safety guard is supplied with this power
tool, it should be attached BEFORE using the
power tool.
The guard is attached at 1 point, by a
hexagon socket head fixing screw to the
nose bracket. .
The adjusting screw should be tightened just
enough to allow the spring washer to hold the
guard up.
The guard has approximately 50mm of travel
which is adequate standard length cutters.
The guard should be adjusted so it is able to
slide with light pressure.
FIXING
SCREW
SAFETY
GUARD
ADJUSTING
SCREW
CLAMPING - MAGNET CONTROL
An electro-magnet is used for clamping the tool onto the
workpiece.
The magnet is controlled by the magnet switch (F) located
at the bottom of the control panel.
‘O’ indicates magnet OFF ‘I’ indicates magnet ON.
Ensure the magnet switch is OFF before connecting the
power supply.
Ensure the magnet is clean and free from debris and that
the machine is on a flat clean ferrous surface of the
required minimum thickness (12mm).
To switch the magnet ON, press the switch to the ‘I’
position, the switch will illuminate to indicate there is a
power supply to the machine.
The security of the magnet should always be physically
checked BEFORE starting the drill unit.
The magnet is protected by a 20mm 2A fast acting fuse (G).
F
G

17 PB70 - W18XC1052 - Revised 040113
The PB70 is a 2 gear variable speed drill unit with nominal load speeds of 60 - 140 and
200 - 470 rev/min. Under load the PB70 will maintain its speed depending on the load
applied. It has a torque boost function to adjust the torque gain between 1.4 - 2.8 rated.
The PB70 has the optimum power / torque / spindle speed for HSS annular cutters in the
range Ø12mm to Ø70mm, cutting EN10025 S235J steel or its equivalent.
The PB70 can also be used on other materials such as high tensile steel and stainless
steel if the appropriate speed for the material to be cut is selected.
CUTTING SPEEDS/MATERIALS—HSS CUTTERS
Cutting Speeds—suggested speed rates for varying cutter diameters / materials
Cutting Speeds (Imperial)
Aluminium 2.37”
Brass 1.75”
Mild Steel 1.00”
High Tensile 0.37”
0.37” 0.75” 1.25” 1.62” 2.0” 2.37” 2.75” 3.12”
Cutter Diameter (inches)
Material
Surface Speed
(Inches/min)
Cutting Speeds (Metric)
Aluminium 60
Brass 45
Mild Steel 24
High Tensile 9
Material
Surface
Speed
(M/min)
WORKPIECE MATERIAL AND SIZE LIMITATIONS - MAGNET
The electro - magnet clamping force is measured as the pull off load when clamped on a
steel plate (EN10025 S235J or its equivalent) of 25mm thickness, flat with a good
surface and free from rust and debris.
For any other workpiece material the clamping force will be different, any difference in
workpiece thickness and the clamping force will deviate.
The minimum recommended plate thickness for the electro-magnet is 12mm thick.
If the workpiece is thinner than recommended then an additional plate, made of suitable
material should be added by clamping to the workpiece, this will help the electro-magnet
become more secure.
BEFORE using the drill always ensure the magnet is held onto the work piece securely.

18 PB70 - W18XC1052 - Revised 040113
OPERATION - SPINDLE - START / STOP
The drill unit or “motor” is controlled by a twin push button
switch (H) on the right of the control panel.
The green button is ON the red button is OFF.
The green button is flush with the surrounding bezel.
The red button is raised above the surrounding bezel.
This is to prevent inadvertent operation of the drill unit.
Before operating the motor start/stop switch ensure the
direction of rotation is selected first. This is achieved by
switching the FWD/REV switch (I)
The motor will not operate unless the magnet is switched
ON first.
BEFORE starting the motor, the security of the magnet
should be physically checked, if any movement is possible
this should be rectified BEFORE using the drill.
The motor control has an under-voltage relay, if the power
is interrupted the motor will stop and will not restart when
the power is resumed until the motor control is operated
again.
OPERATION - SPINDLE SPEED - GEAR SELECTOR
The speed of the motor on the PB70 can be controlled by
changing the gear ratio selector (J) to position I or II.
The gear selector is located on either side of the drill unit
gearbox when viewed from the front.
Gear Selection
To change the gear ratio, consult the chart on the right or
the speed label on the machine, locate the gear selector on
the side of the motor gearbox. Press the selector in against
the spring, slide up or down to choose the appropriate
speed.
The selector has two positions I = Down and II = Up
The selector may have one or two triangular symbols as
shown in the diagram to the right.
J
II Up
I Down
As viewed
from
the front
SPEED SELECTOR
200 -470 Up
60 -140 Down
H
I

19 PB70 - W18XC1052 - Revised 040113
OPERATION - SPINDLE - SPEED CONTROL
The PB70 has variable speed control with load feedback,
this means the drill will attempt to maintain the set speed
when under load, by compensating electronically.
Speed is adjusted by rotating the speed control knob (K).
Available speeds are 60 - 140 with the gearbox in the low
gear and 200 - 470 with the gearbox in the high gear.
Always use the gear closest to the speed required, then
make fine adjustments electronically.
Slowing the motor too much will reduce the cooling action
of the cooling fan and the machine may overheat faster
than normal.
K
OPERATION - SPINDLE DIRECTION - FWD / N / REV
The spindle direction should always be selected BEFORE
operating the motor start/stop switch (H). The spindle
direction switch (I) has 3 positions :-
FWD = Clockwise rotation as viewed from above.
N = Neutral or Off.
REV = Anti–Clockwise rotation as viewed from above.
When switching from FWD to REV or REV to FWD always
stop the motor first then change the direction before
re-starting the motor.
Failure to follow the above procedure could result in damage
to the motor or switchgear.
OPERATION - SPINDLE - TORQUE BOOST
The PB70 has electronic torque boost, this can improve
the motors ability to maintain its set speed when the speed
is low.
Torque can also be reduced if necessary to avoid
breakages when tapping holes.
Torque is adjusted by the torque control knob (L), torque
can be boosted from minimum to 2.8 times the rated
torque. Nominal torque is 79 / 26Nm.
L
H
I

20 PB70 - W18XC1052 - Revised 040113
TAPPING
The PB70, in addition to drilling with annular cutters, is designed to allow the
tapping of screw threads.
The tapping capacity of the PB70 is M6 to M24.
This machine has variable speed and both forward and reverse spindle rotation.
Magnetic based drills are normally used for cutting through holes with annular cutters,
the tapping facility of this drill is for tapping through holes.
If tapping of blind holes is required then an automatic reversing tapping chuck should be
used for best results.
The images below show the available Powerbor taps and holders, these have Powerbor
weldon shanks and fit directly into the 3/4” Weldon shank arbor of the machine.
COMBI DRILL/TAP - M6 - M10
(M12 With Annular Drill) 2-IN-1 DRILL TAP - M12-M24
To tap a hole first set up the machine as for drilling with annular cutters in previous
chapters. Ensure the machine is secure before commencing any drilling operation.
Combi Drill/Tap
Drill the hole to the recommended tapping size for the thread to be cut.
Without disengaging the magnet replace the drill with the tap.
Set the spindle speed to the required tapping speed, apply tapping or cutting compound.
Start the drill spindle in the forward direction and feed the tap into the hole until it begins
to cut. Once cutting the tap will feed itself through, only gentle pressure on the feed
handles should be necessary.
Once the tap has threaded through the plate the drill should be stopped immediately.
The drill spindle should then be switched to reverse and the tap can be fed back out of
the hole.