- posted
13 years ago
I have a Clark CMD1225 mill/drill which is, I believe, a ZX25 clone
made in
Taiwan. Their current version is the CMD1225C which, I'm told, is made
in China.
I'd always assumed that the screw threads were UNC but, when I tried
to fit
new 1/2" UNC nuts to the column clamp bolts, they didn't fit. The
bolts
measure 12 TPI, i.e. 1/2" Whit pitch (UNC is 13 TPI); so do the 1/2"
socket
cap screws which bolt the column to the base.
Is it common for Taiwanese/Chinese m/c tool manufacturers to use
Whitworth?
Whilst on the subject of Whit and UNC (for diameters where the thread
pitches
are the same) I've read lots of dire warnings about mixing male and
female of
different thread forms. I'm quite sure that I've occasionally mixed
them and
not noticed any resultant problem but they haven't been precision
fasteners
torqued to the eyeballs.
Has anyone had known problems when mixing thread forms?
Bob