Universal Air Tools UT5721 - 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)
* available to order 2mm, 2.5mm, 3.5mm and 5mm diameter collets
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
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(4) with a suitable screwdriver. When
making speed checks always rotate the air regulator to the position
to give the highest maximum speed.
Tool Maintenance
It shall be the tool owner’s and/or employer’s responsibility to assure
that tools are maintained in a safe operating condition. Tool
maintenance and repair shall be performed by authorised, trained,
competent personnel. Tools shall be disconnected from their
compressed air supply before repairs are attempted. Repairs shall be
consistent with the manufacturer’s recommended procedures. Tool,
hoses and fittings shall be replaced if unsuitable for safe operation. It
shall be the tool owner’s and/or employer’s responsibility to keep
required rating markings and warnings on the tool in legible condition.
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.
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.
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
Figure 2. Gripping length of collet and chuck