Improved Means for Trueing-up Emery or other Grinding and Polishing Stones.
Year: 1898

page_text: Date of Application, 29th Nov., 1898-Accepted, 4th Mar., 1899
COMPLETE SPECIFICATION.
Improved Means for Trueing-up Emery or other Grinding and
Polishing Stones.
I, HERMANN LAUCKS, of 43, Schmidtstrasse, Berlin, S. O., in the Empire of
Germany, Foreman, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
The object of the present invention is to provide improved means for trueing
by emery wheels or other grinding stones which as is well known in operation
wear unequally.
The turning up or trueing of emery wheels at the present time is usually
effected by a diamond held in a suitable holder but this requires great accuracy
of setting and moreover is expensive as the diamonds in many cases are rapidly
worn away and pulled by force out of their holders.
Turning or trueing up is sometimes effected with other hard materials of a
cheaper kind but as a rule, though the grinding material is less expensive, the
great increase of time taken to effect the trueing more than outweighs this in
the increased amount paid for wages.
Another disadvantage often present is that wheels such as emery wheels require
to be sent to the factory where they have been made to be trued up, and the
trueing is there effected upon a different spindle. As is well known this often
leads to the wheel being out of truth when placed upon its own spindle even
although it may have run perfectly true on the spindle employed to effect trueing
up.
The means I employ in trucing, say, such wheels as emery wheels, consists in
providing a second wheel or disc of as nearly as possible the same material as
that which it is desired to true, and forcing the same against the untrue surface,
allowing the two to run together. This auxiliary wheel or disc is mounted in
such a way that it can readily be applied to and forced against the emery or other
grinding wheel to be trued without removing the latter from its spindle.
In the accompanying drawing illustrating my invention, A is the auxiliary
grinding wheel or disc mounted on the shaft on which is also mounted the
pulley P by which A may be revolved. The shaft C revolves in bearings B B
in the support D, which may be suitably connected with the supporting frame-
work of the emery or other grinding wheel to be trued, so that the two wheels
can be run while forced together.
Grinding material may be dropped between the two surfaces or not, as desired,
but in a short time, if pressure is used, they will chip or grind off each other, and
run exactly true.
The flat surfaces at the side of the wheel can be trued up as easily as the
circular surfaces and different surfaces can be ground by guiding the auxiliary
trueing or grinding disc by hand or automatically as desired.
It is evident that wheels of other material than emery, such as ordinary grind-
ing stones, could be ground or trued up by similar means, and it is also evident

page_text: that these wheels of softer material could be trued up by the employment of a
wheel of harder material such as emery.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I claim
is:-
The improved means for trueing up metal and other grinding or polishing
stones consisting of arranging a second wheel or disc of as nearly as possible the
same material in suitable guides to run against the wheels to be trued, and
arranging this second wheel to rotate or run against the wheel to be trued at any
portion of its surface all without removing the wheel operated upon from its
ordinary spindle.
Date 11 · 800
MARKS & CLERK,
18, Southampton Buildings, London, W.C.,
13, Temple Street, Birmingham,
and 25, Cross Street, Manchester, Agents.