** Gear-Cutting Attachment for Small Lathes [167]
When in need of small gears for experimental or model machines the
amateur usually purchases them, never thinking that he could make
them on his own lathe. A small attachment can be made to fasten in
the tool post of a lathe and the attachment made to take a mandrel
on which to place the blank for cutting a gear. The frame is made
from a 1/2 in. square iron bent as shown in the sketch with the
[Illustration: Gear-Cutting Attachment for Lathes]
projecting end filed to fit the tool post of the lathe. A pair of
centers are fitted, one of which should have a screw thread and
lock nut for adjustment in putting in and removing the mandrel.
All the old clock wheels that can be found should be saved and
used for index wheels. All of these wheels should be fitted to one
end of the mandrel. The blank wheel is put on the outer end of the
mandrel and a clock wheel having the number of teeth desired
placed on the other end. When the mandrel is put in between the
centers a small pawl is fastened with a screw to the frame with
its upper end engaging in a tooth of the clock wheel.
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