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Includes - Foreseen Use, Work Stations, Putting Into Service, Operating,
Operator Instructions Important
Read these instructions carefully before installing, operating,
servicing or repairing this tool. Keep these instructions in a safe
Test Method
Tested in accordance with Pneurop
test code PN8NTC1 and ISO Standard 3744
Vibration Level
Test Method
Tested in accordance with ISO
Less than 2.5
Dismantling, Assembly and Safety Rules
Manufacturer/Supplier Product Type
Universal Air Tool Company Limited
accessible place.
Extended Die Grinder
RPM
22,000
Cycles Per Min
Unit 8
Lane End Industrial Park
High Wycombe
Bucks
Model No/Nos Serial No
UT8735
HP14 3BY
(01494) 883300 (01494) 883237
Product Nett Weight
2.73
1.24 3/8 10 30 10
Recommended Working
Recommended Minimum
Maximum
Use - Safety Glasses
Use - Safety Gloves
Use - Safety Boots
Use - Breathing Masks
Use - Ear Protectors
lbs
Kg
Air Pressure
Personal Safety Equipment
Recommended Use Of
Balancer Or Support
No
bar
6.3
n/a
7.0
bar
bar
90
n/a
100
Yes
Yes
Yes
Yes
Recommended Hose Bore
Size - Minimum
Ins M/M Ft M
Noise Level
PSI
PSI
PSI
Sound Pressure Level 86.6 dB(A)
Sound Power Level 97.90 dB(A)
standard 8662/1 & 8662/13
Recommended Max.
Hose Length
Metres / Sec²
Foreseen Use Of The Tool
This die grinder is primarily designed for use with bonded abrasive
mounted point grinding wheels. It may also be used with steel rotary
files and carbide burrs provided their speed rating matches the speed of
the grinder.
This tool should not be fitted with cutting off wheels, saw blades, drill
bits, etc. If there is any doubt about the correct use of this product
contact your supplier for advice.
Also make sure that the shank size of the attachment to be driven
matches with the collet size fitted in the grinder and that the maximum
allowed running speed of the attachment exceeds that marked on the
grinder.
There are special rules governing the use of bonded abrasive mounted
point grinding wheels - for details see section "Operating".
Work Stations
The tool should only be used as a
handheld hand operated tool. It is
always recommended that the
tool is used when standing on the
solid floor. It can be used in other
positions but before any such use,
the operator must be in a secure
position having a firm grip and
footing and be aware of the extra
safety precautions that must be
observed when using Grinding
Machines.
Putting Into Service
Air Supply
Use a clean lubricated air supply that will give a measured air pressure
at the tool of 90 p.s.i./6.3 bar when the tool is running with the
lever/trigger fully depressed. Use recommended hose size and length.
It is recommended that the tool is connected to the air supply as shown
in figure 1. Do not connect the tool to the air line system without
incorporating an easy to reach and operate air shut off valve. The air
supply should be lubricated. It is strongly recommended that an air filter,
regulator, lubricator (FRL) is used as shown in Figure 1 as this will supply
clean, lubricated air at the correct pressure to the tool. Details of such
equipment can be obtained from your supplier. If such equipment is not
used then the tool should be lubricated by shutting off the air supply to
the tool, depressurising the line by pressing the lever/trigger on the tool.
Disconnect the air line and pour into the intake bushing a teaspoonful
(5ml) of a suitable pneumatic motor lubricating oil preferably
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incorporating a rust inhibitor. Reconnect tool to air supply and run tool
slowly for a few seconds to allow air to circulate the oil. If tool is used
frequently lubricate on daily basis and if tool starts to slow or lose power.
It is recommended that the air pressure at the tool whilst the tool is
running is 90 p.s.i./6.3 bar. The tool can run at lower and higher
pressures with the maximum permitted working air pressure of 100
p.s.i./7.0 bar.
Operating
Select a suitable mounted point that has a free running speed higher
than the maximum running speed marked on the tool. Make sure that
the diameter of the shank exactly matches the diameter of the collet
mounted in the grinder. There are four standard sizes of collet available
for use with this grinder, i.e.
1) - 1/4" Dia (0.250ins) (6.35mm)
2) - 6mm (0.236ins)
3) - 1/8" (0.125ins) (3.175mm)
4) - 3mm (0.118ins)
Never try to force a 1/4" diameter shank into a 6mm collet or a 1/8"
diameter shank into a 3mm collet. Never try to close a 1/4" diameter
collet to secure a 6mm shank or a 1/8" diameter collet to secure a
3mm diameter shank. Always match correctly the shank size to the
collet size. If uncertain, have parts measured by a competent person.
Push the shank as far as possible into the collet and tighten the collet nut
using the spanners provided on
the collet nut and output spindle.
The shank of the mounted point
may be pulled forward from the
maximum insertion length but
always ensure a minimum
gripping length of not less than
10mm - See Figure 2.
Be aware that the allowed
running speed of the mounted
point is lowered because of an
increase in the length of the shank
between the end of the collet and
the body of the mounted point.
This distance is shown in Diagram
2 as "LO" and is called the
overhang. The information with respect to mounted point size,
permissible running speed and reduction in running speed due to an
increase in overhang is available from the supplier of the mounted point.
If the increase in overhang for access reasons takes the permissible
running speed of the mounted point below the free running speed of
the grinder select a smaller diameter mounted point.
The fitting of the mounted point should be done by a trained operator.
When first starting the grinder with a new wheel fitted, the grinder
should not be near other persons and be held in a protected area, i.e.
under a bench and run for a few seconds. This will protect personnel
from possible effects of damage to the mounted point before it was
fitted to the grinder i.e. wheel breakage.
Always use eye protection and wear protective gloves if there are sharp
edges in the work area. The tool and the grinding process can create a
noise level such that the use of ear protectors is advised.
If the grinding process creates a dust then use a suitable breathing
mask.
Check that the material being worked will not cause harmful dust or
fumes. If this is so then special breathing masks may be required.
If the grinder vibrates when first fitting a mounted point or during
operation, remove from service immediately and correct fault before
continuing to use.
Do not apply excessive pressure as this will reduce the cutting efficiency
and can bend the shank of the mounted point causing vibration and the
possibility of breakage. Apply light loads to allow the wheel to cut.
Handle the grinder with care. If the grinder is dropped, carefully check
the mounted point for damage, i.e. cracks, chipping and start for the
first time as for fitting a new wheel i.e. under a bench.
Never exceed the maximum air pressure. If there is this possibility
always use this grinder with a pressure reducing valve fitted in the
Figure 2. Gripping length of collet and chuck
supply line. Your supplier will advise of suitable equipment.
This grinder is fitted with a speed regulator and the speed may be
reduced by rotating air regulator (21) with a suitable screwdriver. When
making speed checks always rotate the air regulator to the position to
give the highest maximum speed.
Dismantling & Assembly Instructions
Disconnect from air supply.
Remove collet nut (75) and collet (76). Grip the motor housing (1) on
the flats at air inlet end in a vice with soft jaws and unscrew inlet bushing
(82) and remove screen (44). With a sharp pointed tool lever out
retaining ring (32) and pull out exhaust deflector (30).
Tap out pin (36) and remove safety lever (18). Do not dismantle safety
lever (18) unless replacements are required.
Unscrew valve screw (22) and remove O-Ring (35), O-Ring (34), air
regulator (21), valve spring (39), valve stem(20) and O-Ring (33).
Unscrew coupling nut (14) and remove extended front end assembly
complete.
To dismantle extended front end assembly, coupling nut (14) may be
unscrewed from extension housing (71) [left hand thread].
Grip extension housing (71) on the flats in a vice and unscrew spindle
nut (73) [left hand thread]. Pull out spindle and bearing assembly and
grip on the hexagon of drive nut (16) and unscrew extension shaft (72)
using the flats on the extension shaft. Bearings (79) and (80) may be
tapped off of extension spindle (72).
Remove coupling (24) and pin (38) assembly
and pin (38) may be tapped out of coupling
(24). Unscrew lock ring (15) complete with ORing (81). Pull out motor assembly.
D = diameter of mounted point
T = length of mounted point
Lo = overhang
S = diameter of shank
Lg = gripping length
Grip the motor assembly by hand or in a soft
jaw vice and tap the rear end of the rotor (3)
through the rear end plate (4) and bearing
(40). Tap rear end bearing (40) out of rear end plate (4). Remove 5 off
rotor blades (5) and remove cylinder (2). Pins (37) may be removed
from cylinder (2). Grip rotor (3) in a soft jaw vice and unscrew drive nut
(16). The rotor (3) can then be tapped through front end bearing (41),
shim (27), front end plate (17) and collar (23). Front end bearing (41)
can be tapped out of front end plate (17) and shim (27) can be
removed.
Clean and examine parts for wear and replace only with manufacturer
supplied parts. Ensure that the faces of end plates (4) and (17) that abut
cylinder (2) are flat and free from burrs. Lap on a flat, very fine grade of
abrasive paper if necessary. Check O-Rings for cuts and wear.
Reassembly
Lightly coat parts with oil, pack bearings with a lithium or molybdenum
based general purpose grease and reassemble in the reverse order.
Note:- when reassembling the motor assembly, ensure that pins (37) in
cylinder (2) are correctly located in the holes in front end plate (17) and
rear end plate (4). Also ensure that pin (83) located in the outside
diameter of front end plate (17) locates in the slot in motor housing (1).
Check the collet assembly, the function of the safety lever and that the
free speed is correct before returning to service. Ensure that the air
regulator is in the maximum open position before making a speed
check.
Safety Rules When Using A Die Grinder
1) Read all the instructions before using this tool. All operators must be
fully trained in its use and aware of these safety rules.
2) Always select suitable abrasive to use with this tool - see Operating
Instructions.
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UT8735 Extended Die Grinder
Ref No Part No Description
1 731752 Motor Housing
2 731759 Cylinder
3 731760 Rotor
4 731757 Rear End Plate
5 731761 Rotor Blade (5)
14 731774 Coupling Nut
15 731775 Lock Ring
16 732232 Drive Nut
17 731764 Front End Plate
18 900382 Locking Lever
20 729259 Valve Stem
21 729282 Air Regulator
22 729262 Valve Screw
23 731762 Collar
24 731781 Coupling
27 729714 Motor Shim
30 729702 Exhaust Deflector
32 729703 Retaining Ring
33 1012370 O-Ring
34 729088 O-Ring
35 729073 O-Ring
Dec 2006 Ver 1.30
Page No 3
Ref No Part No Description
36 729167 Roll Pin
37 731267 Roll Pin (2)
38 732234 Roll Pin
39 729258 Valve Spring
40 1005062 Ball Bearing
41 729113 Ball Bearing
44 1005726 Exhaust Screen
71 732235 Extention Housing
72 732230 Extention Shaft
73 732228 Spindle Nut
74 729715 Pinion
75 729719 Collet Nut
92253 1/4" Collet
76
79 732231 Ball Bearing
80 732229 Ball Bearing
81 732238 O-Ring
82 732449 Inlet Bushing
83 900720 Roll Pin
732227 6mm Collet
92232 1/8" Collet
732224 3mm Collet
732248 Spanner Wrench
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Accessories
Declaration of Conformity
Universal Air Tool Company Limited
Unit 8, Lane End Industrial Park, High Wycombe, Bucks, HP14 3BY, England
declare under our sole responsibility that the product
Model UT8735 Extended Die Grinder, Serial Number
to which this declaration relates is in conformity with the following standard(s) or other normative document(s)
EN792 (Draft), EN292 Parts 1 & 2, ISO 8662 Parts 1 & 13, Pneurop PN8NTC1
following the provisions of
89/392/EEC as amended by 91/368/EEC & 93/44/EEC Directives
Lane End D.H.Moppett (Man Director)
Place and date of issue Name and signature or equivalent marking of authorised person
3) Always shut off the air supply to the grinder and depress the lever to
exhaust air from the feed hose before fitting, adjusting or removing the
mounted point.
4) Always adopt a firm footing and/or position before using the grinder.
5) Use only correct spare parts.
6) Check hose and fittings regularly for wear. Do not carry the tool by its
hose.
7) Do not remove and never tie down the safety lever.
8) Never exceed the maximum air pressure and check the free running
speed frequently. Have air regulator fully open when making speed
checks.
9) Use safety equipment as recommended.
10) Take care against entanglement of moving parts of the tool with
clothing, ties, hair, cleaning rags, etc.
11) Use only compressed air at the recommended pressure.
12) Do not attempt to fit any other attachment than those
recommended - see "Foreseen Use of Tool".
13) If the tool appears to malfunction, remove from use immediately,
and arrange for service and repair.
Notes
Distributor
This document may not be copied wholly or in part by anyone without the consent of the Directors of Universal Air Tool Company Limited
Designed & Written in the U.K.
©Copyright of Universal Air Tool Company Limited, established in the United Kingdom, 1994
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