On pp.85-96 of Gingery's book, he explains how to bore the holes in the headstock of the lathe. Basically, he installs a temporary lathe on the ways, the spindle of which lathe is a boring bar in which a cutting tool is embedded. The future headstock of the real lathe one is building is them moved along the ways towards the boring bar and the tool bores the correct hole in the headstock. He mentions that one could also do this with the tailstock but it is better to use the headstock as soon as it becomes available.
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? 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. 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 snipped-for-privacy@zurich.ai.mit.edu
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