On 02/28/2018 10:55 AM, Jon Elson wrote:
I know a number of you guys have Hardinge HNC and CHNC machines
retrofitted with LinuxCNC.
I have a friend/customer local to me who needs a CNC lathe that can
crank out aluminum parts 1.5" in diameter. There's a CHNC-I
relatively local to us that is going pretty cheaply.
Can anybody tell me a few tidbits about the CHNC-I? Do 16C collets
fit directly into the spindle, or need some kind of plate to fit
them? It does have the air collet closer on the back of the spindle.
Some have 5C others have 16C.
Generally the 5C machines have a threaded spindle nose, mine has the 16C
with and A2-5 nose.
This one has the General Numerics control on it, so that dates it as
one of the early ones.
Is the spindle DC or AC? What is the likelyhood of the spindle drive
still working? It is a 460 V machine,
if the spindle is AC, can the motor be rewired for 240 V? (If it can,
then coming up with a 240 V VFD would be totally simple. If DC, then
a big DC servo drive could get expensive.)
At 480V it may be AC.
Mine was DC with a big ugly drive and weird voltages. I made a bearing
holder with shaft ( kind of a jack shaft ) to replace it and mounted an
AC motor below it driven from a VFD
I seem to remember these machines might have resolvers, but maybe that
was just the VERY old HNC with the GE control.
Yes on the resolvers on older machines, mine is a 1978 model. Converted
to encoders.
I'm not familiar with the tooling required on the tool turret, what is
it called and where would you get it from?
Depends on which height tooling plate you have. Measure from the top of
the plate to the center of the spindle. The common heights are 3/8" and
1/2".
I made a set of blocks that clamp to the turret plate and bored them in
place so I could use standard boring bars for tooling along with a
couple of Hardinge holders. A left hand boring bar becomes an external
turning tool, threading also works that way.
Thanks much for any info on this!
Jon
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