Civil Engineering Reference
In-Depth Information
Fig. 2.16. A typical transfer punch. This one is spring loaded. In use the cone is
pushed into the hole, and then the end of the punch is given a light tap with a ham-
mer to make a centre punch mark.
I used a transfer punch to mark the machine table through the back plate.
Then I drilled and tapped the milling machine's table to fix the back plate on.
I checked that the back plate was parallel to the top of the table by using a
height gauge and a parallel to ensure all was correct.
I held the scale onto the back plate and moved the reading head to a suit-
able position in the middle of the cross slide casting. Do not put it at the end
of the casting as we do not want the reading head to foul the ends of the
readout scale. I again used the transfer punch to mark the mounting holes for
the scale and the reading head.
The reading head should remain in alignment in all directions - horizontally
and parallel to the table - and not interfere with the table's oiler or travel lock.
The reader will probably be fitted with a couple of plastic alignment clips to
hold the reading head in the correct position. Do not remove these clips until
the scale and reader head are all screwed up tight. (The X traverse locking
screw may need replacing with a longer screw to operate.) Finally, fit the cov-
er and the X axis scale is finished.
