On 3/18/24 18:50, Jon Elson wrote:
On 3/18/24 07:53, Todd Zuercher via Emc-users wrote:
Gene,
In all honesty I wouldn't mind knowing more about your VFD source you
say you want black listed. I'm so sick of trying to track down high
speed VFDs that I'm almost tempted to pay the machine manufacturer's
ridiculous 3X normal retail list price markup the next time we need a
new one. We occasionally have needed a replacement VFD capable of
running about a 15kw 4pole router spindle at up to 24krpm (that is
800hz output, most drives seem to max out at or are limited to
500-600hz output.) The last time we tried to order a new drive with
these specs it was put on back order for more than 1 year before we
canceled the order. (We canceled after the delivery date had been
pushed back 3 months for the 5th time.) Then we bought a used one off
of ebay. (Tracking down a used drive on ebay with documented proof of
the correct high speed firmware, when the sellers have no clue, is
also another annoying trick to perform.)
I bought a $79 eBay special VFD for my Bridgeport R2E3 retrofit. The
entire programming sheet was one large sheet of paper. I wanted to
program torque boost at the low-end. I could do that, but then the motor
had an overcurrent at full speed. There needed to be a breakpoint where
the torque boost faded out, but I couldn't figure out how to set that.
So, I finally broke down and spent more money on one from Automation
Direct. It came with a 90+ page book that had all the parameters
listed, and showed how they interacted. Very good, clear and
understandable.
And worthless w/o that.
There are arms controls on high frequency VFDs.
Yeah the ITAR stuff IIRC. The one that came as OEM on the 6040 didn't do
anything it was told, ran in random directions etc. I threw it in the
trailer and bought a $120 clone on ebay. Its done as it was told for
around 5 years now. But its been changed once as the OEM motor was 120
volt and I was going blind from the blinking shop lights so when the 120
volt motor bearings went out, 3 or 4 hours running, the whole thing
was replaced by 250 volt 4 bearing stuff. One session with bad water I
had to learn about, should still modify it with a deionizer. but its not
plugged up the motor,,, yet... That 6040 has stepper/servo's on the Z
and B axises. the Z because the 4 bearing motor is bigger and heavier so
stock couldn't lift it, same size motor in stepper/servo picks it up at
60 ipm. And has never faulted. B axis is another stepper/servo, follows
the Y at 400 rpm carving vice screw threads in perfect sync. 4mm tall
buttress threads, 50mm in diameter two start, 12mm pitch in hard maple.
3NM motors on 5/1 worms, chucks, shaft adapters, mounts, all 3d printed,
works great. And no (expletive) PID's in sight. They do exactly as the
tp or motion tells them to do. Sweet.
Jon
Take care & stay well Jon.
Cheers, Gene Heskett, CET.
--
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
- Louis D. Brandeis
_______________________________________________
Emc-users mailing list
Emc-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/emc-users
