Considering how much of the Ru munitions have western chips proves how much of
the world is willing to cheat for a buck.
> On Mar 18, 2024, at 7:33 PM, gene heskett wrote:
>
> 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
>
>
>
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