Re: [CAD_CAM_EDM_DRO] Inverter question

In a message dated 07/01/2000 7:56:40 AM Hawaiian Standard Time,
janders@... writes:

<< Given that I want to put a 3-5hp motor in it eventually, could I run the
1hp motor off a 5hp inverter? >>
Jon,

On my Hardinge DVM-59, I stripped off the motor and the variable speed
assembly. I then installed a 3 horse pulled from an old building A/C air
handler. I was gonna install a 5 hp but funding was not there. (Nor was there
a free one!) I did go to a 5 hp Yaskawa inverter. Since you can program
current as well as the voltage and frequency, I did not think there would be
a problem running the 3 hp. I have run it over 1000 hours in this
configuration. Not a hint of problems. I don't see why the 1 HP would not
work.

However, I would recomend a 3 or 5 hp motor if you are doing any tapping.
I tap at 300 to 500 spindle rpms but have a step up drive so the motor RPM is
lower. I think torque would be too low to run a 1/2" tap in stainless in a 2
hp or smaller motor.

On my current part, it drills a 5/8" dia 6061-T6 part 1/2"-20 tap drill
.75" deep at 2500rpm, then it taps the hole at 350 rpm, bumps up to 3500 rpm
and turns the OD and parts off. Bar puller pulls new blank and starts all
over again. 56 seconds part to part. Made over 2100 in a week. Gotta make
300 more now.

Peter
THRD, Inc.