..-
truing should be discarded or returned to the wheel
mmufacturer-though incases of
necessity
the con-
STEEL
~ ~ ~ ~ ~
-~~~~--
-
dition may
be
corrected by digging outpart of
the^^^-
wheel beneath the flange and filling with leadas
indicated by a test for static balance.
Wheel Truing.
A
wheel truing fixture isfurnished
Proper mounting with the machine. The truing diamond
(
furnished
)
of
grinding wheel. may be applied to the wheel along any
1
ine on the
lower half of the wheel circumference, though pre-
ferably at the bottom of the wheel
as
show. To
To equalize the clamping pressure, washers of
cardboard or rubber should be placed between the
wheel and the two flanges, Most wheels of the sire
used on this machine have a ring of heavy blotting
paper on eacn sloe, which serves the Purpose.
Using the pin wrench furnished, tighten the
Clamping nut enough to hold the wheel firmly in
place On the sleeve. Do not tighten too much,how-
ever, as excessive clamping pressure will crack
the wheel.
Changing Wheels. In removing a wheel sleeve
from the spindle, always use the wheel sleeve
puller (furnished with the machine) to avoid any
chance of cracking ithe wheel or damaging the
spindle bearings by pounding. Remove the spindle
nut
(
this nut has a left-hand thread the outer mem-
ber of the wheel sleeve puller into the wheel sleeve
and tighten the inner screw against the spin-die,
thus, loosening the wheel sleeve without harmful
jarring.
Inputting a wheel onthe spindle, examine both
the wheel sleeve hole and the spindle.end are per-
fectly clean. Then slip the sleeve onto the spindle,
seat it by hand and tighten by means of the clam-
ping nut and wrench.
Balance of Wheel. It is essential that the wheel
run perfectly true and without vibration. Grinding
wheels are balanced by the manufacturer and, in the
prevent gouglng, the center line of the diamond tool
should point slightly the center of the wheel inthe
direction of movement of the wheel surface.
The wheel should
be
trued each time it isput on
inespindie and wnenever it becomes loaoed, duli
or glazed. Pass the diamond across the wheel with
a slow, steady manual cross feed, taking care to
avoid any longitudinal movement of the table.
In truing a wheel for for rough grinding, take a
cut aWut O.Olm/m deep inone pass of the diamond
across the wheel and finish with a similar cut
0.000,25" deep. If the wheel is to be used for fini-
shing grinding,take two O.Olm/m cuts; then take twc
or three additional cuts removing about 0.000,25" eact
time, and finally pass the diamond across the wheel
once or twice without further advance of the wheel.
I.
.
.
Wheel truing fixture in use.
case of wheels of the size used on. this machine,
.
should not require attention inthis respect other than The figures stated are ao~roximateand under some
..
rr
conditions should be varied somewhat to give desired
truing.
A
whbel that runs badly out of balance after results.
.
.
