Universal Air Tools UT8735 User Manual

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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
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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