REX RG-RH User manual

ޓޓޓޓޓޓޓޓޓޓ - Note -
ޓBe sure to hand this operation manual to the user.
ޓCarefully read through the manual before using the machine
to ensure safe and effective use.
ޓBe sure to keep the manual where the operator can refer to
it whenever necessary.

ޓ
٨Be sure to observe the Safety Precautions described below to prevent accidents such as fire, electric
shock and injury.
٨Read these Safety Precautions carefully before using the machine, and operate the machine according
to the instructions.
٨Do not use the machine in any way other than as described in this operation manual.
Definitions ofޓޓޓޓޓޓޓޓޓޓand
In this operation manual, warnings are divided into ޓޓޓޓޓޓޓޓޓ and .
ޓޓޓޓޓޓޓޓޓޓ: indicates actions which could possibily result in death or severe injury to the user
if the machine is used incorrectly.
ޓޓޓޓޓޓޓޓޓޓ: indicates actions which could possibly result in injury to the user, or physical
damage, if the machine is used incorrectly.
Even items described as , could have serious results under certain conditions.
Be sure to observe these warnings carefully, as they greatly affect safety.
࡮If this operation manual is lost or damaged, promptly order a replacement from your distributor or our
sales department.
࡮Parts and specifications are subject to change without prior notice due to improvements in quality,
performance or safety standards. In such cases, the contents, photographs, illustrations, etc. in this manual
may be different to the product you have purchased.
㧍WARNING 㧍CAUTION
㧍CAUTION
㧍WARNING 㧍CAUTION
㧍CAUTION
㧍WARNING
ޓޓޓޓޓޓޓޓޓޓޓޓCONTENTS
1. Safety Precautions
2. Precautions when using the Portable Groover H
3. Main parts, Specifications, Standard accessories
4. Setting up
ޓޓޓޓԘSetting up
ޓޓޓޓԙAttaching to the pipe threading machine
ޓޓޓޓԚSetting the pipe
5. Operating Instructions
ޓޓޓޓԘOperating the pump
ԙAdjusting the depth of the groove
ޓޓޓޓԚGrooving
ޓޓޓޓԛChecking the dimensions
6. Before requesting repairs or servicing / Troubleshootingޓޓ
7. Daily inspection, maintenance
8. Requesting repairs
P. 1
P. 3
P. 4
P. 5
P. 8
P. 8
P.11
P.11
P.12
P.13
P.14
P.15
P.15

-1-
1. Safety Precautions
1) Ensure you use the correct voltage.
-Be sure to use the voltage indicated on the name plate of the main unit or in the operation manual.ޓ
If the voltage is different from the voltage indicated, overheating, smoke or fire may occur.
2) Check the switch is OFF, before inserting the plug into the power supply socket.
-If the plug is inserted into the power supply when the switch is ON, the machine may start operation abruptly,
and is liable to cause accidents. Be sure to check the switch is OFF.
3) Be sure to avoid electric shock.
-Do not touch the plug with wet hands.
-Do not use the machine in rain or in places where water can easily get into the machine.
-Be sure to ground the machine to avoid electric shock.
4) Take notice of conditions at the work site.
-Do not use the machine in rain, humid or damp places, or places where water can easily get into the machine.
Humidity will lower insulation of the motor and cause electric shock.
-
Do not use close to flammable fluids or gases, such as gasoline and thinner. Doing so could lead to fire or explosion.
5) Use designated accessories and attachments.
-Do not use accessories and attachments other than those designated in the operation manual or our
catalogues. Accidents or injuries might result.
6) In the following cases, turn the main unit OFF and pull the plug out of the power supply socket.
-When the machine is not in use or parts are changed, repaired, cleaned or inspected.
-When accessories are changed.
-When hazards are expected (including electric power failure)
When the plug is inserted, the main unit may start operation unexpectedly, causing accidents.
7) If any abnormality is noticed, stop operation immediately.
-When the machine does not operate smoothly or abnormalities such as unusual smells, vibration or
noise are detected, immediately stop operating the machine.
-Check symptoms against the items in Troubleshooting at the end of this manual, and follow the appropriate
instructions.
-If the machine is used continuously it might lead to overheating, smoke or fire, resulting in accidents or injury.
If overheating or smoke from the main unit occurs, do not attempt an overhaul but ask for an inspection
and repair.
8) Keep the work site clean.
-Ensure you keep the worktable and the work site in good order, and well lit. A cluttered site and worktable are
liable to cause accidents.
9) Do not let unauthorised personnel come near the machine.
-Do not let anyone other than authorised personnel touch the main unit or the power supply cord or operate the
machine.
-Do not let people other than authorised personnel enter the work site, especially children. Injuries might occur.
10) Do not use the machine with force.
-Use the machine only for its designated purpose.
To assure safe and effective operation, operate according to the capacity of the main unit. Applying excessive
force may not only cause damage to the product but also accidents.
-Do not use the machine in the any way that could cause the motor to lock, or cause smoke or fire.
11) Wear neat clothing.
-Do not wear neck ties, clothes with open sleeves, loose clothing or accessories such as chains, necklaces, etc.,
which could get caught in the rotating parts.
-When working outdoors, it is recommended that you wear rubber gloves and non-slip shoes. Slippery gloves and
shoes are liable to cause injuries.
-Cover long hair with caps or hair nets to prevent them from getting caught in rotating parts.
-Wear safety caps, safety shoes, etc. according to the working environment.
㧍WARNING

-2-
1. Safety Precautions
12) Do not work in an unnatural posture.
-Keep a firm footing and balance to avoid falling over and injuring yourself.
13) Remove tools such as wrenches.
-Before turning ON the switch, check that tools used for inspection and adjustment have been removed.
If you use the machine when tools are left inside it, accidents and injuries may occur.
14) Operate the unit with great care.
-Always work with great attention to how you handle and operate the machine and the surrounding
conditions. Carelessness may result in accidents and injuries.
-Do not operate the machine when concentration is lowered such as when tired, after drinking alcohol,
when sick, affected by medicines, etc.
15) Handle the power cord with care.
-Do not carry the product by the cord, or pull the plug out of the socket with the cord.
-Do not place the cord near heated objects, fats & oils, cutters or objects with sharp edges.
-Take care not to pull or tread on the cord, or apply unnecessary force resulting in damage to the cord. Doing so
could lead to electric shock or a short-circuit resulting in fire.
16) Perform careful maintenance daily.
-When changing accessories and parts, follow the operation manual.
-Periodically inspect the power supply cord and plug. If damaged, ask your distributor or our sales
department for repairs.
-If an extension cord is used, inspect the cord periodically and, if damaged, replace it. If extension cords are used
outdoors, use extension cords designed for outdoor use to prevent electric shock, short-circuit or fire.
-Keep parts used for gripping the machine dry and clean and free of oil and grease. Slipping may cause injury.
17) Check for damaged parts.
-Before using the machine, carefully check for damage to the protective cover and other parts, and
check both normal operation and specified functions.
-Check for any abnormalities such as in adjustment of movable parts, tightening, damage to parts, and
all parts affecting operation.
-Do not use the machines if the stop and start switches do not work.
-In replacing or repairing a broken protective cover and other parts, follow the instruction manual.
If no instructions are specified in the instruction manual, ask your distributor or our sales department for repairs.
18) Store carefully when the machine is not in use.
Store in a dry place away from children and locked with a key.
19) For overhaul and repair of the machine, ask an appointed REX agent.
-Our products comply with corresponding safety standards. Do not remodel.
-Be sure to ask your distributor or our sales department for any repairs.
-If repairs are carried out by unskilled or unqualified personnel, the performance of the unit will be adversely
affected and may result in accident or injury.
㧍WARNING

-3-
2. Precautions when using the Portable Groover H
㧍WARNING
1) Mount the groover on specified pipe threading machines that have been tested for
safety.
(See Table 1, Pg. 5) Do not attempt to use on any other machines.
The correct rotational direction is the direction when threading.
2) Use the rollers that match the pipe. (Refer to Table 2 on Pg. 6)
ޓThe standard roller set can be used only for 2"- 6" steel pipe (SCH 10-40). It cannot be used
for thin wall stainless steel pipes or pipes of a different size. Since applicable sizes are
marked on the rollers, replace the rollers according to the size of the pipe.
3) Never touch rotating parts or workpieces.
ޓTo prevent injury to hands and fingers, do not touch rotating rollers and pipes with your
hands.
4)
Attach the mount kit that matches the pipe threading machine to be used. (See Table 1, Pg. 5)
If a different type of mount kit is attached, it with not be possible to set it on the pipe
threading machine correctly.
5) Make sure the threading machine rotates in the right direction.
The direction for threading is the right direction. If it is in the reverse direction, the pipe will
fall out, which can be very dangerous.
6) The pipe must be set correctly.
(See Fig. 14, Pg. 10)
Set the pipe so that it is in the right direction and at 0.5qto the axis of the machine's
main shaft.
If it is thrown into reverse, the pipe will fall out, which can be very dangerous.
7) Make sure you operate the handle on the hydraulic pump correctly.
(See Table 5, Pg. 13)
If you operate the handle too quickly, the pipe may be distorted and/or the machine will
be damaged.
8)
After completing the groove, be sure to check on the size of the groove with a groove gauge
or calipers, etc. (See Table 6, Pg. 13, Roll Groove Standard Machining Size)
9) Be sure to place the pipe threading machine and pipe stand on a stable, flat surface.
Avoid using the pipe threading machine and pipe stand in an unstable position or
the machine and pipe may fall over.

-4-
3. Names of parts, Standard specifications, Accessories
عSpecifications
Net Weight (kg)
Standard accessories
Optional
Accessories
Model Name
RG-RH
Grooving Capacity
عNames of parts
Fig. 1
Connecting shaft
Spacer
Main shaft nut
Main shaft
Upper roller
Pump Handle
Push knob Adjusting nut
Safety cover
Cylinder
Hydraulic pump
Hydraulic valve
Guide roller Lower roller
1" - 16" Schedule 10
1" - 12" Schedule 40
Standard Model
For 2" - 6" Schedule 10 - 40
35. 8kg (including connecting shaft)
Connecting shaft
Socket head cap screw (M10 x 25)
Spring washer (10mm)
1" - 11/2" Roller Set (Schedule 10 - 40)
2" - 6" Roller Set (Schedule 10 - 40): Also as standard accessory
8" - 12" Roller Set (Schedule 10 & 8" Schedule 40)
10" - 12" Roller Set (Schedule 40)
14" - 16" Roller Set (Schedule 10)
1" - 11/2"MainShaft
1" - 6" Pipe Support
8" - 12" Pipe Support
Roller set for thin wall stainless steel (1" - 11/2", 2" - 3", 4" - 6")
Mount kit
M-HR1 REX 50A (N50A, NP50A, NR50A, P50A, R50A)
M-HR2 REX 80A (S80A, N80A, NP80A)
M-HR3 REX 100A (N100A)
M-HE1 #300 (#300)
Spacer 1" - 6": Also as standard accessory
Spacer 8" - 12"
Spacer 14" - 16"
:1
:8
:8
Hex wrench (8mm)
T wrench (5mm)
Spanner (30mm)
:1
:1
:1
Roller shaft

-5-
4. Setting Up
1. Setting Up
㧍CAUTION
1) Attaching the Mount Kit:
Fix the mount kit to the main body securely
with the eight bolts (M10 x 25) and their
corresponding spring washers (10 mm). (Fig. 2)
㨯Always attach the mount kit that matches the
pipe threading machine used. The mount kit
cannot be attached to the pipe threading
machine correctly if a mount kit for a
different type of machine is used.
Which pipe threading machine it can be
attached to is indicated on the mount kit.
Attach the mount kit in the correct direction.
(Fig. 2)
㨯If the mount kit is attached in the opposite
direction, an unnecessary load will be applied
to the threading machine's chuck, thereby
resulting in damage. Fig. 2
Bolt (M10 x 25)
Spring washer (10mm)
Mount Kit
Hook
Code No.
Table 1 Mount Kit
Name For use with
M-HR1 REX 50A
M-HR2 REX 80A
M-HR3 REX100A
M-HE1 #300
N50A, NP50A, NR50A, P50A, R50A, NPG150A
(Cannot be used on the NT50.㧕
S80A, N80A, NP80A
N100A
#300
341560
341561
341562
341563
Mount Kit

Name
1" - 11/2" Roller Set
2" - 6" Roller Set
(Standard accessory)
8" - 12" Roller Set
10" - 12" Roller Set
14" - 16" Roller Set
SUS1" - 11/2" Roller Set
SUS2" - 3" Roller Set
SUS4" - 6" Roller Set
-6-
4. Setting Up
㧍CAUTION
2) Attaching the Connecting Shaft:
㨯Place the connecting shaft fully over the main
shaft, then fix it in position by tightening the
two screws against the flat surface of the main
shaft. (Fig. 3)
㨯Be sure to tighten the screws against the flat
part of the main shaft as illustrated. If the
screws are tightened against the cylindrical
part, they will come loose while grooving,
and the main shaft will not turn properly.
3) Replacing the Roller Set:
㨯The standard roller specifications are 2" to 6"
for steel pipe.
Where other sizes of steel pipes are to be
machined, replace the roller set (upper and
lower roller). The appropriate sizes are
stamped on the roller. (Fig. 4)
㧍CAUTION
㨯Be sure to replace the upper and lower rollers
as a set. If the wrong combination is used,
correct grooving will not be possible.
Fig. 3
Connecting shaft
Fixing screw
Size mark
Main shaft
Fig. 4
2-6
2Ð6
2Ð6
Code No.
Table 2 Roller Set
Mark For use with
1-1
1/2
2-6
8-12
14-16
SUS 1 - 11/2
SUS2-3
SUS4-6
341113
341133
341111
341137
341138
341118
341119
341120
Schedule 10 - 40 steel pipe
Schedule 10 - 40 steel pipe
Schedule 10, 8" Schedule 40 steel pipe
Schedule 40 steel pipe
(Maximum wall thickness : 10. 3mm)
Schedule 10 steel pipe
Thin wall stainless steel pipe Schedule 5 - 10
2-6
*When using the 1" - 11/2" Roller Set (Code No. 34113), the main shaft (341141) for 1" - 11/2" rollers is
required a
saset.
Upper roller 8- 12
Lower roller10 - 12

-7-
4. Setting Up
Replacing the Roller Set (Figs. 5, 6)
Replacing the Main Shaft
عRemoving the rollers
عInstalling the rollers
(Apply the above procedures in reverse)
Code No. Name Mark For use with
1"-11/2" Main Shaft None 1"-11/2"
Table 3 Main Shaft
341141
Main shaft Main shaft nut
Bolt
Bearing plate
Push
Fig. 8
Fig. 5
Fig. 6
1) Loosen the bolts and turn the safety cover
clockwise. (Figs. 5, 6)
2) Remove the upper roller by loosening the fitting
screws on the upper roller and pulling out the
roller shaft. (Fig. 6)
3) Pull out the lower roller by loosening the
hexagonal nut on the main shaft and removing
the washer. (Fig. 7)
1) Match the key on the roller shaft with the key
groove in the upper roller and firmly lock with the
fitting screw.
2) Insert the lower roller into the main shaft, and
firmly lock with the hexagonal nut.
3) Replace the safety cover and tighten the screws.
* Before setting up, clean the inside surface of the
roller and the shaft of waste. Apply grease to the
entire circumference of the upper roller shaft and
the inside surface of the lower roller.
* Be sure to change the upper/lower rollers as a set.
1) Remove the rollers in the order above.
2) Loosen the fixing screw on the main shaft nut, turn
the nut anti-clockwise and remove from the main
shaft.
3) Press the main shaft and remove from the main
body.
4) Installation: Insert the main shaft into the main
body. Then screw in the main shaft nut as far as it
will go and tighten the fixing screw. Bearing plate,
then tighten it firmly with the 4 bolts.
㧍CAUTION
㨯Clean the main shaft thoroughly with a cloth
before setting up.
Avoid letting iron powder or foreign bodies
get inside the main unit, as this will damage
the machine.
Fig. 7
Fixing screw

-8-
4. Setting Up
Fig.11
2. Attaching to the Pipe Threading Machine
3. Setting the Pipe
㧍WARNING
㨯Be sure to place the pipe threading machine
and pipe stand on a flat stable surface.
Avoid using the machine and pipe stand in an
unstable position since they may fall over.
㧍CAUTION
㨯The pipe to be machined should be cut square,
have no step difference, and be free of
deformaties.
If the pipe end is slanted or has a step
difference, or if the pipe is deformed, it cannot
be machined to the correct size of groove. (Fig.
11)
㧍CAUTION
㨯Use the mount kit that matches the pipe
threading machine you are using.
㨯Lift the machine with 2 people or use a hoist.
The machine is heavy. Lifting it by yourself
could result in injury.
1) Fully open the front chuck.
2) Pull the carriage fully towards the front chuck.
(Fig. 9)
3) Place the mount kit on the carriage support bar,
and tightly secure the connecting shaft in the
front chuck. (Fig. 10)
4) Place the hook over the carriage support bar
and fix it in position.
Tighten the bolt on the hook securely.
The following pipes cannot be machined to
the correct size:
㨯Thepipeendis
slanted.
㨯There is a step
difference.
㨯The pipe is deformed.
㧍WARNING
㨯Use an approprite pipe stand or there is a
danger of the threading machine falling over or
being damaged. (See Table 4, Pg. 9)
Fig. 9
Front chuck
Carriage
support bar
Fig.10
Carriage
Carriage
support bar
Mount base
Hook
Bolt

-9-
4. Setting Up
Fig.12
Contact with the flange (collar)
Fig.13
Machinable
Pipe Length (MIN)
Maximum
Machinable Length
of Pipe without a
Pipe stand
Pipe Size
1"-2"
21/2"-4"
5"-6"
8"-16"
120mm
120mm
120mm
120mm
800mm
700mm
600mm
500mm
Table 4 Machinable Pipe Length
㧍WARNING
㨯If you use pipes longer than those shown in
Table 4 above, use 2 stands to support the
pipe. (Fig. 13)
㨯Failure to do so may result in the machine
and pipe falling over, thereby causing an
accident.
1) Setting a pipe
㨯Insert the pipe to be machined until it
comes into contact with the lower roller
flange (collar). (Fig. 12)
2) Pipe height adjustment
㨯Since the pipe threading machine is approx.
2ࠑoff horizontal, adjust the pipe stand
height so that the pipe is 2 degrees lower.
(Fig. 13)
2ࠑlower
than horizontal
L : Entire pipe length
3/4 L
Pipe stand
Pipe
Maximum
Machinable Length
of Pipe Using 1
Pipe Stand
2000mm
2000mm
1500mm
1000mm
Pipe
Lower roller
Flange

-10-
4. Setting Up
3) Pipe shifting adjustment
㨯Adjust the pipe by shifting it 0.5ࠑto the main
shaft.
㧍WARNING
㨯If the pipe is set straight on the main shaft
or set in the opposite direction, it will come
off while grooving and fall off, which could
be dangerous.
Fig.14
Pipe centre
Pipe threading machine
Centreofmainshaft
0.5q

-11-
5. Operating Instructions
1. Operating the pump
1) Check that the hydraulic pump valve is in the
ON position. (Fig. 15)
2) Lift the pump handle firmly in one go and
the upper roller will be lowered onto the
pipe. (Instant drop) (Fig. 16)
3) Keep lifting the pump handle up and down
until you have finished processing the pipe.
The upper roller will gradually press deeper
into the pipe to create a groove. (Fig. 16)
4) When you set the hydraulic pump valve to
OFF, the upper roller will return to its resting
position. (Fig. 15)
2. Adjusting Groove Depth
1) Loosen the hydraulic pump valve, and pull
the pump handle up firmly to engage the
upper roller lightly with the pipe. (Fig. 17)
2) Place the spacer on the upper surface of the
cylinder and lightly tighten the adjusting
nut. (Fig. 18)
* Hold the spacer in position so that the
thickness matches the size of the pipe you
are working on. (Fig. 20)
* The spacer is used as a reference when
adjusting groove depth. After an initial trial,
use the adjusting nut to fine-tune to the
appropriate groove depth.
* If the groove is too shallow, turn the adjusting
nut anti-clockwise to increase the depth of
the groove. Conversely, turn the nut
clockwise to make the groove shallower.
* One sub-division of the larger divisions on the
adjusting nut is equivalent to approximately
0.3 mm. (Fig. 19)
3. Loosen the hydraulic valve and remove the
spacer from the cylinder.
Cylinder
Spacer
Adjusting nut
Spacer
Tighten
Fig.17
Fig.18
Fig.19Fig.20
Adjusting nut
Deeper Shallower
1-2
4-6
4-6
SCH40
1
1
/
2
-3
Hold spacer in position
with thickness matching
pipe size.
Fig.15
Hydraulic
pump valve
ON
OFF
Upper Roller
Engage with
pipe
Fig.16
Pump hundle
Instant
drop
Upper
roller

-12-
5. Operating Instructions
1) Turn the hydraulic pump valve to the ON
position, and pull the pump handle up quickly
and firmly to engage the pipe lightly with the
upper roller and then raise the pump again.
2) Turn the push knob on the guide roller to
lightly engage the guide roller with the pipe.
In this position, tighten the knob a further half-
turn to push the guide roller against the pipe.
(Fig. 22)
The amount you tighten depends on the pipe.
Tighten lightly for thin pipes; more for thick or
hard pipes.
Ascertain the most suitable amount you should
tighten according to the pipe's size and
material. If you tighten too much, the end of
the pipe will flare; if not tightened enough, the
pipe may fall out when working on it.
3) If the threading machine has a switch for
changing directions, use in the forward
(normal) direction position for cutting threads.
(Fig. 23)
3. Grooving
4) Turn the threading machine on to start the
pipe rotating.
Allow the pipe to rotate several times to
ensure that the pipe does not slip away from
the lower roller flange.
㧍CAUTION
㨯If you use the machine in the opposite
direction to threading (reverse), the pipe
may fall out, which can be very
㧍WARNING
㨯Should the pipe slip off the lower roller,
turn the threading machine OFF
immediately to stop it rotating. If the pipe
slips out while still rotating, the pipe will
become detached from the lower roller
and could fall out, which is very dangerous.
(Fig. 24)
Loosen the hydraulic valve and reset the
pipe. If the pipe slips out, shift the pipe a
little more.
Fig. 22
Fig. 24
Fig. 23
Fig. 21
Correct
direction
Upper Roller
Pipe
Lower roller
Pipe
If the pipe slips out,
immediately turn
the switch OFF.
Pipe slipping out

-13-
5. Operating Instructions
5) Use the hydraulic pump to start the grooving
process. (Fig. 25)
ޓRefer to the table below for how to operate
the pump safely.
6) As soon as the adjusting nut touches the upper
surface of the cylinder, switch the machine OFF
and stop pumping. (Fig. 26)
4. Checking the dimensions
ޓBe sure to check the depth of the groove and the
dimensions of each part of the machined pipe
according to Table 6 below.
ޓIf the handle is pushed too quickly, the pipe may
become distorted and the machine may break
down. Be careful to use the handle correctly.
Fig. 25
Fig. 26
Fig. 27
LW
OD G
㧍CAUTION
࡮The specified size for each part of the pipe
may differ slightly, depending on the joint.
࡮In such a case, make sure you check the
machining size according to the specified
size table for the joint used.
Push the handle once for each
rotation of the pipe.
Push the handle once for every
two rotations of the pipe.
Table 5
Schedule 10
Schedule 40
25
32
40
50
65
80
100
125
150
34.0
42.7
48.6
60.5
76.3
89.1
114.3
139.8
165.2
30.4
39.1
45.0
56.9
72.2
84.9
110.1
135.5
160.8
16.0
16.0
16.0
16.0
16.0
16.0
16.0
16.0
16.0
7.1
7.1
7.1
8.7
8.7
8.7
8.7
8.7
8.7
±0.8
±0.8
±0.8
±0.8
±0.8
±0.8
±0.8
±0.8
±0.8
1
11/4
11/2
2
21/2
3
4
5
6
AB
Nominal Pipe outer diameter
(O.D) (L) (W) (G)
Seal surface width Groove width Groove diameter
Table 6 Roll Groove Standard Machining Size
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
+0.4
- 0.9
Adjusting
nut
Cylinder
Pump hundle
0-1
0-1
0-1
0-1
0-1
0-1
0-1
0-1
0-1

-14-
6. Before requesting repairs or servicing
㧍WARNING
If there are any abnormalities with the unit, check the following and inform your distributor or our sales
department.
If any problems are not dealt with below, do not attempt to overhaul or repair the unit by yourself, but
call your distributor or our sales department.
If repairs are performed by untrained or unskilled personnel, optimum performance cannot be attained,
and accidents and injuries may occur.
࡮The roller set doesn't match the pipe
ޓsize.
Possible Causes Corrective measuresProblem
࡮The pipe has been cut at an angle.
࡮The pressure of the resin guide roller
is too weak.
࡮The pipe is elliptical in shape.
࡮Speed of grooving is too fast.
࡮Guide roller pressure is too strong.
࡮The roller set differs from pipe size.
࡮The pipe support is too high.
࡮The speed of grooving is too fast.
࡮The pipe shift angle is too large.
࡮The pressure of the resin guide roller
ޓis too weak.
࡮The pipe shift is in the opposite direction.
࡮The threading machine is rotating in the
ޓwrong direction.
࡮The pipe is too straight on the lower
ޓroller, or the angle of the shift is too
ޓsmall.
࡮The pipe stand is too high.
࡮The knurling on the lower roller is
ޓclogged up or worn.
࡮The speed of grooving is too fast.
࡮The width of the groove is too
ޓnarrow or too wide.
࡮The groove zigzags.
ޓThe groove is not parallel with
ޓend of the pipe.
࡮The diameter of the groove is
ޓnot consistent around the
ޓwhole of the pipe.
࡮The pipe end flare is too great
ޓ(bell mouth).
࡮The pipe slips off the lower
ޓroller when grooving.
࡮The pipe slips while it is being
ޓprocessed and doesn't rotate
ޓsmoothly.
࡮Operating the pump doesn't
ޓincrease the depth of the
ޓgroove.
࡮Oil leaks from the hydraulic
ޓunit.
࡮The adjusting nut is too tight.
࡮The pump valve and/or packing are
ޓdamaged, resulting in insufficient
ޓpressure.
࡮The cylinder packing is damaged.
࡮Replace roller set with one that
ޓmatches the pipe size.
࡮Cut the pipe at right angles.
࡮Retighten the push knob and engage
the guide roller with the pipe a little
more strongly.
࡮Make sure the pipe is perfectly
ޓcircular.
࡮Operate the pump a little more slowly.
࡮Loosen the push knob so that it
contacts the guide roller more lightly.
࡮Replace the roller set with one that
ޓmatches the pipe size.
࡮Adjust the height of the pipe support
ޓso that the pipe is 2ࠑlower than the
ޓhorizontal.
࡮Operate the pump a little more slowly.
࡮Adjust the pipe shift angle to 0.5ࠑ.
࡮Re-tighten the push knob and attach
the guide roller to the pipe a little
more strongly.
࡮Shift the pipe in the right direction.
࡮Correct the direction of rotation.
࡮Make the shift angle a little larger.
࡮Adjust the height of the pipe support
so that the pipe is 2ࠑlower than the
ޓhorizontal.
࡮Use a wire brush to clean up the
ޓknurling, or replace the lower roller
ޓas necessary.
࡮Operate the pump a little more slowly.
࡮Loosen the nut and process the pipe
ޓagain.
࡮Ask for repairs.
࡮Ask for repairs.
عTroubleshooting
࡮Groove depth is too shallow. ࡮The pressure of the hydraulic unit is too
weak.
࡮Ask for repairs.
࡮Ask for repairs.
࡮The upper roller doesn't go
right down.
࡮The hydraulic unit doesn't have enough
oil.

-15-
7. Daily inspection, maintenance
㧍WARNING
8. Requesting repairs
Fig. 28
A. Overall inspection
1) Inspect the fitting screws (A)
ޓޓInspect screws and nuts on each part of the machine, and retighten if loose.
ޓޓAmong other things, check the screws on the upper roller and the nuts on the lower roller.
If the screws are loose, the roller will be damaged.
ޓޓCheck that the screws on the mount kit are tightly fastened.
2) Inspect the threading machine's electrical connections and cables (B)
ޓޓCheck for damage to the plug and power cord, and replace if necessary.
ޓޓTo prevent electrical leakage and shock, ensure the machine is properly grounded.
3) Inspect the rollers (C)
ޓޓCheck that the rollers match the type of pipe being processed or normal grooving will not be possible.
ޓޓCheck for chips or cracks in the rollers. If they are damaged or broken, they will not perform correctly ޓޓ
ޓand the machine will be damaged. Replace them if necessary.
4) Periodical lubrication (C)
ޓޓTo prevent burning or galling, be sure to lubricate regularly.
ޓޓWhen replacing rollers, apply grease to the entire circumference of the upper roller shaft and to the ޓޓޓ
ޓinside of the lower roller.
ޓޓRemove the upper roller every two weeks and replenish the bearings with grease.
ޓޓApply grease to the grease nipple on the side of the machine.
5) Clean after use (A)
ޓޓTo prolong the life of the machine, be sure to clean the machine and the rollers each time after you use it.
ޓޓ
Before carrying out any inspections or machine maintenance, make sure you unplug the threading machine.
If the machine suddenly starts to operate while checking it, it may lead to accidents and injury.
ޓThis machine is produced with great precision; therefore, should the machine fail to operate normally, do not
repair it by yourself, but call us for repairs.
ޓIf parts are required or if you have any questions, please contact us at your earliest convenience.
B.Inspection of rollers
C. Grease nipple
C. Grease nipple

A Guarantee and Exemption from Liability
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 
REX
REX INDUSTRIES CO.,L TD.
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