A brake resistor is not required but if you do use one make sure that it is
of such a value that does not stop the lathe too quickly since that can
cause faceplates and chucks to loosen and come off from what I understand.

All AC variable speed drives use 3 phase motors. Setting the maximum is
probably a good idea since the motor's rpm is rated at 60Hz so why turn your
drive components at 33% faster than the nominal design.

My VFD General has a 4-step pulley in the drive which allows the motor to
develop maximum torque at low speed settings (since the motor can run at a
more optimum rpm). I would use the Reeves drive to set the desired "range"
and then use the VFD to control within that range. You can also look at it
as a bit of a safety feature since you can't run the lathe up to max spindle
rpm by mistake with a big blank mounted on it when the Reeves drive is set
for a lower speed. Since you only have a 1 HP motor gearing via the Reeves
drive will probably be beneficial if you are turning some heavy wet blanks.

I have put a remote stop/start switch and speed control pot on my General.
Be sure to follow any instructions carefully. I used shielded cable to keep
out any interference and be sure it is well routed to prevent physical
damage and make sure there are no stress points where the cable flexes. I
don't know what happens if the VFD loses one of the speed pot wires due to
breakage - would it run up to max rpm?
billh

"Rick Cox" wrote in message
m...
I hope to bring and old Rockwell lathe back to life this weekend.
The lathe is a Rockwell Delta 46-450 1HP 3phase monster with the Reeves
speed control on it.
I would really like to restore this lathe, but I want to see it run before
I
spend to much time or money on it.

After some research (love that OWWM) I decided to try the VFD route
instead
of replacing the motor.
I got a used Toshiba VFD on ebay for $80.00 and a great manual with wiring
diagrams. I have read that the reeves gear on that lathe works pretty
well,
so I may only use the vfd as an inverter, but I really am intrested in the
flexibility.

I also learned that the larger Jet, Delta, Performax lathes use the VFDs
with 3 phase motors. My father has the JET 1642 and I noticed that it also
has a brake resistor. Would this be a good thing to get before I try the
VFD, or is it all that necessary?

I saw a "Hint" in the manual that you might want to set the Maximum
Frequency for an older non VFD designed "General Purpose" motor to max out
at 80hz. Has anyone done this?


To start out, I plan on using the 0-60hz and control the vfd from its own
control panel, how ever, i would like eventually use a remote
potentiometer
and run stop switch.

If any one has any additional tips I would appreciate it.

If everything goes ok I will have a great heavy lathe,
If not....I have to get rid of a heavy lathe.....

Have a good day
Rick