"Allan Adler" wrote in message
...
snip
On pp.94-96, he explains how one can advance the cutting tool .010 inch
to enlarge the hole a little at a time. He does this using a feeler gauge
and an adjustable gauge that one needs to build and which attaches to the
boring bar.

I would just like to be clear about the use of this adjustable gauge.
For example, is it supposed to remain attached to the boring bar while
one is boring the hole and the motor is turning?

No, it is removed after each use.

That seems to present a
possible hazard, in that the adjustable gauge could come lose and come
flying at you. On the other hand, if one removes the adjustable gauge,
maybe reattaching it could be a source of errors in the diameter of the
hole one is boring.

The adjustability of the fixture is to establish a relative reference point.

The shimstock allows relatively precise *relative* adjustment without
needing to know the absolute position.

A parallel: standing on the ground, if you wanted to position your head
exactly 1/4 inch higher all you would need to do is stand on a 1/4 inch
plate.

But maybe that doesn't matter, since Gingery only
says it has to be about a .010 inch cut each time, not exactly a .010
cut each time, and one also has adjustible calipers to check the final
result.

So, is Gingery assuming the reader has enough common sense to remove
the adjustable gauge? Or is one not supposed to remove it?

Ignorantly,
Allan Adler



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