1N4437, Thanks, success...
Posted by
dougrasmussen@c...
on 2000-09-13 10:43:14 UTC
Group,
I had several replies telling me where to get the 1N4437, also one of
my customers had one. (I asked him why he happened to have it, said
he'd been waiting 20 years hoping someone would ask for one!!!)
Since I already had the modern plastic cased one I used a dropping
resistor to bring the output down from 110 to 90V. Now that the
output is dropped the clutch coils seem to be running fairly cool. (I
didn't like how hot they were getting with the 110V).
This turned out to be quite a project aside from the rectifier
issue. While troubleshooting the clutch mechanicals I found the
contact disks were hopelessly worn out of the adjustment range. The
usual adjusment procedure is too add or remove shims to achieve the
specified .015" gap. Because of wear my gap was close to .075", too
wide for a simple shim adjustment. A little surface grinding on some
spacers brought things back into range. While I was into everything
3 sets of 3L belts got replaced. Messy job, working at floor level
on components caked with 30 years of grease and grime. Anyway, after
everything is said and done the clutches are quicker acting than I
remember them ever being.
While on this subject, if any of you guys come across a Hardinge DSMA
at a good price buy it. These machines are money makers, even in the
age of CNC. My machine ran for 15 years in a high production shop
and I've run it average 15 hours a week for 15 more years. These
machines speak well of the quality of older Hardinge's. Also, I was
able to call Hardinge's service people on their 800 number and get
very knowledgeable tech help on a 30 year old machine all for no cost
whatsoever!!!! Try that with some other machine brands.
thanks for all the advice,
Doug
I had several replies telling me where to get the 1N4437, also one of
my customers had one. (I asked him why he happened to have it, said
he'd been waiting 20 years hoping someone would ask for one!!!)
Since I already had the modern plastic cased one I used a dropping
resistor to bring the output down from 110 to 90V. Now that the
output is dropped the clutch coils seem to be running fairly cool. (I
didn't like how hot they were getting with the 110V).
This turned out to be quite a project aside from the rectifier
issue. While troubleshooting the clutch mechanicals I found the
contact disks were hopelessly worn out of the adjustment range. The
usual adjusment procedure is too add or remove shims to achieve the
specified .015" gap. Because of wear my gap was close to .075", too
wide for a simple shim adjustment. A little surface grinding on some
spacers brought things back into range. While I was into everything
3 sets of 3L belts got replaced. Messy job, working at floor level
on components caked with 30 years of grease and grime. Anyway, after
everything is said and done the clutches are quicker acting than I
remember them ever being.
While on this subject, if any of you guys come across a Hardinge DSMA
at a good price buy it. These machines are money makers, even in the
age of CNC. My machine ran for 15 years in a high production shop
and I've run it average 15 hours a week for 15 more years. These
machines speak well of the quality of older Hardinge's. Also, I was
able to call Hardinge's service people on their 800 number and get
very knowledgeable tech help on a 30 year old machine all for no cost
whatsoever!!!! Try that with some other machine brands.
thanks for all the advice,
Doug