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 <ghesk...@shentel.net> 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 > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
