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Graduating dials
is a fun job that I never seemed to have the right equipment for.
As with some of the other items on these pages, I decided to order a kit
from Hemingway to save
the trouble of finding all the right bits and pieces.
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This is an old pic from the hobber pages, the work head on the hobber is
being used to graduate its own dial. Not ideal, as the toolbit is being
held in the lathe chuck.
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The finished item which is toolpost mounted and has a top mounted turret
to select calibrate, units marker, fives marker, and tens marker.
Unfortunately, I didn't take any pictures as I was
making it up, although the tool is fairly simple to make anyway.
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This is the business end which deals with engraving the marks.
It's a HSS toolbit which can be swapped left/right and moved to the other
end if required (the function of the tool can be completely reversed).
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Another view of the turret. This uses a ball bearing and spring
inside the turret to 'click' between the different positions. I couldn't
get this to work correctly, and ended up using a larger ball bearing instead
of the one supplied with the kit.
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Here's an example of work produced by the graduating tool - the micrometer
drum from the Versatile Dividing Head. |
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