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Posted by on October 5, 2008, 2:47 pm
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Hi,
I'm just about to start to build a Hemmingway rear toolpost and I will
use a 12mm dimension for the clamp post instead of the 1/2 inch in the
drawings ('cos I am Mr Metric). My question is a general one about
threads in this type of application :
As it happens, I have taps and dies for M12 x 1.0 (fine) and M12 x
1.75 (coarse) threads and I wondered which is perferable in a clamping
application like this ? ISTM that you get the greatest clamp force
with the fine thread, but then again, isn't the coarse thread a bit
stronger ? What would normal engineering practice say about choosing
between these 2 threads ? I actually have a slight preference for the
fine thread because my die in that size is adjustable so I can make
the post to fit the clamp nut whereas my die for the coarse thread is
an el-cheapo non-sdjustable type which I don't have much confidence
in.
All advice gratefullly received,
David
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