Dinasaw T-REX User manual

T-REX
Automatic Chain Sharpener
INSTRUCTION MANUAL
Version 7.0

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This manual should remain with the machine when resold or
transferred to a new operator. The manual contains important safety
procedures and instructions, which should be carefully and
thoroughly read before operating the sharpener.
This machine is intended for use by professional operators who are
familiar with the general requirements of chainsaw sharpening and
the types of machinery used within this industry.
Caution
This machine uses a rotating grinding wheel to remove metal. As a
consequence grinding dust and metal particles will be emitted and
may be projected at high speed from the grinding contact area.
Remove flammable substances from the vicinity of the machine.
Read manual before use
Do not stand behind machine
Ensure guards and shield are in place
Wear face and dust masks
Use correct grinding wheel rated at 6500 rpm or more
Check grinding wheel for cracks before use
The machine is designed for sharpening chainsaw teeth and grinding
drag (depth gauge/rakers) links and is not to be used for offhand
grinding, or with the grinding head in the raised position.
Distributed by:

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SAFETY PROCEDURES
Always wear a safety visor
Always wear a dust mask
Never stand or allow other people behind machine
Do not operate machine without safety guards in place
Always check grinding wheels for cracks before use
Keep hands out of machine when connected to power
Handle chains with care
Specifications and safety measures
Requirements Description Range
Temperature Operating 5 to 35 degrees Celsius
Power Current requirement 8 amps continuous (35 amps motor start
inrush)
Over current & Overload 10 Amp Fuse
protection
Voltage operating range 12 to 15 volts DC Stabilised & Regulated +/-
0.1%
Safety AC input It is recommended to fit a residual current
protection device when using an AC/DC
power source.
AC Supply Disconnect the power supply when not in use
Guards Do not use unless all safety guards are fitted.
Maintenance Disconnect from power before performing any
maintenance.
Grinding wheels Check speed rating and condition before use
Environment Operating Use in a ventilated and well lit area.
Weight Gross 22 kg
Installation Positioning Machine should be positioned in such a way as
to prevent access to the rear when machine is
operating.
Transportation Lifting Lift only from underneath the machine.
Transporting Use the original packaging

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LIMITED WARRANTY:
Dinasaw warrants that its products will be free of defects in workmanship or material. Should any
failure to conform to this warranty appear within the period of 6 months or 100 hours of
operation, whichever comes first, from date of purchase, Dinasaw shall upon notification of and
substantiation that the product has been stored, installed, operated and maintained in accordance
with Dinasaw’s specifications and instructions, repair or replace, at Dinasaw’s sole option, any
components or parts of the product determined by Dinasaw to be defective.
This warranty is exclusive and is in lieu of any warranty of merchantability, fitness for a
particular purpose or other warranty of quality, whether express or implied.
LIMITATION OF LIABILITY:
Dinasaw shall not under any circumstances be liable for special or consequential damages, such
as, but not limited to, damage or loss or other property or equipment, loss of profits of revenue,
cost of capital, cost of purchased or replaced goods, or claims of Purchaser for service
interruption.
The remedies of the purchaser set forth herein are exclusive and the liability of Dinasaw with
respect to any contract, or anything done in connection therewith such as the performance or
breach thereof, or from the manufacture, sale delivery, resale, or use of any goods covered by or
furnished by Dinasaw whether arising out of contract, negligence, strict tort, or under any
warranty, or otherwise, shall not, except as expressly provided herein, exceed the price of the
goods upon which such liability is based.
The warranty period for Dinasaw products is 100 hours or 6 months, whichever is sooner, from
date of purchase. Grinding wheels are excluded from the warranty. Parts damaged through abuse
or fair wear and tear are excluded from the warranty.
No transportation costs of any kind are covered under this warranty. Transportation charges to
return products for repair shall be the responsibility of the customer. Returned goods shall be at
the customers risk and expense.
Serial Number
The serial number is located on the back of the machine.
Record these numbers and keep in a safe place as they will be required in the
event of warranty service.
Serial Number ___________________ Purchase Date __________________

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Table of Contents
6 Check List
7 Installation
8 Wall Mounting
10 Assembling the Tri-Pod stand (Optional)
12 Bench mounting
13 Operational Overview
14 The Control Panel
16 Assembling the Machine
19 Adjustments
20 Fitting the Grinding Wheel
21 Dressing the Grinding Wheel
23 Fitting the Chain
24 Adjusting the Clamp Opening
27 Feed Stroke & Pawl Height Adjustments
29 Operating Modes
30 Auto Cutter Sensor Setup
33 Magnet Mode Setup
34 Magnet Positioning for Sensing
35 Adjusting the length of the Cutters
36 Adjusting how much to grind
38 Changing the Side Plate Angle
39 Changing the Top Plate Angle
40 ‘0’ Degree Top Plate Angle
41 How to Grind the Depth Gauges
42 Chains with Double Tie Links
43 Safety Chain
44 3/4” Harvester Chain
46 How to check the Cam Timing
47 Leaving the machine for extended periods
48 Trouble Shooting
49 Things to watch out for
50 - 58 Parts Drawings & Numbers
59 Wiring Diagram
63 Warranty Registration
IMPORTANT
Grinding is dangerous. You should become thoroughly familiar with the
information supplied in this manual before operating this machine.

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Check List
Unpack the machine and check that the following components are supplied.
Standard T-Rex accessory bag.
1 x Instruction CD 1 x Instruction Manual
1 x Dressing Stone 2 x 5mm Spring Washers
2 x 5mm Hex Nuts 2 x M5 x 10 Pan Head Screws
1 x 10/13mm Spanner 1 x 2.5mm Hex Key
1 x 3mm Hex Key 1 x 4mm Hex Key
1 x 6mm Flat Washer 1 x DC Lead
1 x Magnet 1 x Clear Shield
1 x 6mm Hex Key
Wall / Bench mounting Bracket
1 x Bracket Body 2 x M6 x 12 bolts
1 x Brace 2 x 6mm flat washers
1 x Mounting Plate 1 x M10 Nyloc Nut
1 x 10mm Flat Washer 1 x M8 x 12 Bolt
1 x 8mm Spring Washer
Optional Tri-Pod Stand
1 x Support Stand 3 x Sets of Legs
9 x M5 x 8 Pan Head Screws 9 x M5 Locknuts
2 x M6 x 12 Hex Head Bolts 2 x 6mm Flat Washers
Power Supply Stand Bracket (Optional)
1 x M6 x 40 Pan Head Screws 1 x M6 Nut
1 x Bracket 1 x 6mm Spring Washer
Power Supply
1 x Power Supply with AC power cord.

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Installation
CAUTION
GRINDING SPARKS WILL BE EMMITTED IN THIS AREA!
When positioning the machine it is recommended to have a wall or shield immediately
behind the machine to prevent people from standing behind the machine.
Power Requirements
The Dinasaw Chainsaw Sharpener can operate from a well charged automotive battery
as well as a suitable regulated switch mode power supply.
It is important however that the lead from the battery / power supply to the machine is no
longer than 2 meters (6 feet).
CAUTION
DO NOT USE AN UNREGULATED POWER SUPPLY AS DAMAGE TO THE
ELECTRONIC COMPONENTS MAY OCCUR.
USE OF AN UNREGULATED POWER SUPPLY WILL VOID THE WARRANTY
ON THE CONTROL MODULE.
Do not stand, or allow others to stand behind
the machine while it is operating

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Wall / Bench Mounting

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Machine attached to wall bracket.
Cutter Terminology
Side Plate Angle
Top Plate Angle

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Assembling the Tri-Pod Stand (optional)
Do not over tighten the screws in the legs as damage to the screws may occur.
Fig 1

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Fig 2.
Fit the machine onto the support frame and tighten securely. See fig 2.
Adjust the legs so that the machine sits level on the support frame.
Large harvester chains may require the machine to be tilted back slightly to prevent the
chain from catching on the rear plate of the machine. To do this, shorten the centre leg
by approximately 25mm (1 inch).
Fig 3
Protection shield
Attach power supply onto leg as shown.
Ensure power leads are not near moving
parts and covers are fitted to prevent dust
from entering the power supply.

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Bench Mounting the Machine (Brackets not supplied)

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Overview of Operation
The T-Rex uses cams to operate the feed, clamp and grinding head. The “Grind Cam”
raises and lowers the grinding head while the “Feed Cam” both indexes and clamps the
cutters. CAUTION:
Excessive clamping pressure will damage the machine
The T-REX model has four modes of operation.
“OFF” - Sharpens left and right hand cutters without detection
“AUTO” - Uses cutter sensor to detect and grind two cutters in a row.
“MAGNET” - Uses a magnet to detect and grind two cutters in a row.
“SCRATCHER” - Allows the sharpening of scratcher chain. (Requires options).
The machine uses four sensors to operate automatically.
1. The cutter sensor “looks” at each cutter and determines what hand it is.
2. The proximity switch senses a magnet placed on a cutter to correct the grinding
sequence for out of sequence cutters. It also serves as a counter to automatically
shut off the machine.
3. Two other sensors are located inside the machine. One, located in the feed motor
to count motor revolutions and the second, behind the idler gear which checks
the bevel angle of the grinding head.
Adjustments
There are four main adjustments which need to be made when changing between
different size chains. (see previous page)
1. Limiting the feed stroke.
2. Setting the feed pawl height.
3. Centring the grinding head.
4. Chain Clamp Limitations
1. The T-Rex model cannot automatically sharpen chains with three or more
cutters in a row on the same side of the chain. Two is the maximum.
2. Chains with three or more tie links in one section of the chain must be stopped at
this point with the magnet, as the feed stroke will not cope with more than two
tie links.
3. Chains with double tie links cannot be sharpened using “AUTO” mode as the
sensor will not ‘see’ the cutter after the double link. Only use “MAGNET” or
“OFF” mode on these chains.

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The Control Panel
Power indicator light:
· Indicates that power is on.
Function indicator light:
· When in “Run Mode” light is on.
· When magnet is detected light will go out momentarily.
Detection mode indicator:
· Indicates which mode machine is in.
· “OFF” - No detection. Machine grinds sequentially.
· “AUTO” - Automatically detects double cutters (left or right).
· “MAGNET” - Corrects only after chain magnet passes proximity switch.
Stop / Reset:
· Stops the machine.
Start:
· Starts the feed mechanism.
Power indicator
Mode indicator
Grinder on/off
Detection mode
Count
Function indicator
Stop / Reset
Start
Inch forward
Inch reverse
Counter display

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Grinder:
· Turns the grinder motor on - press again stops motor.
Inch Fwd:
· “Inches” machine forward when not in run mode.
Inch Rev:
· “Inches” machine in reverse when not in run mode.
Detection Mode:
· Changes between the three detection modes and is shown by the Mode
Indicator lights.
Counter:
· Sets number of times chain circuits (maximum of 9)
· Counter is triggered by placing the magnet on chain (Low down on side-
plate, on or between the rivets of a cutter).
Counter Display:
· Indicates number of circuits a chain will do, referenced by the chain
magnet.
Holding Count and pressing Inch Fwd.
· Positions the machine for adjusting the top plate angle of LEFT hand
cutters.
· Display will show a symbol.
Holding Count and pressing Inch Rev.:
· Positions the machine for adjusting the top plate angle of RIGHT hand
cutters.
· Display will show a symbol.

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Assembling the machine
Connect the AC lead to the
power supply
Check the voltage selection
switch.
Failure to correctly set this
switch will destroy the unit
and void the warranty.
Connect the output of the power supply
to the machine.
Switch the machine on and wait 15 seconds.
Switch down to turn on.
Carefully tilt the motor arm fully back
until the latch engages.

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Press and hold the ‘COUNT’ button and press
the ‘Inch Fwd’ button, then release both
buttons.
This will force the machine to run to the
position for setting the LEFT side angle.
Remove the nut from the bolt.
DO NOT WITHDRAW THE BOLT!
The stepped face of the spacer must be
against the bearing (see picture left)
Attach the motor plate in the position shown.
Lower the arm.

Rotate the motor to the
desired angle on the
LEFT side and tighten
the bolt with the 6mm
hex key.
Connect the wires.
Press and hold the ‘COUNT’ Button and
press the “Inch Rev’ Button, then release
both Buttons.
This will force the machine to
run to the position for setting
the RIGHT side angle.
Insert the 4mm hex key
into the end of the motor
arm and turn until the
indicator shows the exact
same angle on the right
side.
Turn Clockwise initially.
Attach the protection Shield

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Adjustments
The diagram below shows the main adjustment positions on the machine.
1. Grind Depth Adjuster: Sets the grinding depth.
2. Grind Head Centring Adj. Centres the grind head on the chain.
3. Feed Pawl Height Adjuster: Sets the feed pawl height to suit the chain pitch
4. Feed Stroke Adjuster: Limits the return stroke of the feed arm.
5. Chain Clamp Adjusts the clamping pressure.
6. Cutter Position Screw: Sets the amount of material ground from the face of the
cutter.
1. Grind Depth Adjuster
2. Grind Head
Centring Adjuster
3.
Feed Pawl
Height Adjuster
4. Feed Stroke Adjuster
5. Chain Clamp
6. Cutter
Position Screw

Fitting the Grinding Wheel
Fit the grinding wheel.
Tighten the securing nut
finger tight only. Fit the
grinding wheel cover and
protection shield.
Do not use tools to fit nut.
Finger tight only.
Note: Retaining nut has left hand thread
Recessed face against
grinding wheel
Attach wheel cover by pushing over
locating screws and turning anti clockwise.