Universal Air Tools UT5735 - Manual (Page 2)

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.
Dismantling & Assembly Instructions
Disconnect from air supply.
Remove collet nut (25) and collet (24).
Unscrew coupling nut (14) and remove extended front end
assembly complete.
To dismantle extended front end assembly, coupling nut (26)
may be unscrewed from extension housing (23) [left hand
thread].
Pull out motor assembly.
Grip the motor assembly by hand or in a
soft jaw vice and tap the rear end of the
rotor (15) through the rear end plate (14)
and bearing (13). Tap rear end bearing
(13) out of rear end plate (14). Remove
4 off rotor blades (16) and remove
cylinder (18). Pins (17) may be removed
from cylinder (18). The rotor (18) can
then be tapped through front end bearing (20), front end plate
(19) and spacer (12). Front end bearing (20) can be tapped out
of front end plate (19).
Clean and examine parts for wear and replace only with
manufacturer supplied parts. Ensure that the faces of end plates
(14) and (19) that abut cylinder (18) 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
(17) in cylinder (18) are correctly located in the holes in front end
plate (19) and rear end plate (14). Also ensure that pin (17)
located in the outside diameter of front end plate (19) locates in
the slot in motor housing (33).
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.
pour into the intake bushing a teaspoonful (5ml) of a suitable
pneumatic motor lubricating oil preferably 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.
Page No 2
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 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 (41) . When making speed
checks always rotate the air regulator to the position to give the
highest maximum speed.
D = diameter of mounted point
T = length of mounted point
Lo = overhang
S = diameter of shank
Lg = gripping length
Figure 2. Gripping length of collet and chuck