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Messages - DonMarkey

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41
What's to formula for sizing them?  This is a 3hp motor.
Don

42
Kind of what I thought. As work we use Allen Bradley drives with brakes, but these were less than half the price.

43
Third party software and hardware support forums. / Any vfd experts here?
« on: January 08, 2017, 10:22:24 AM »
This is on a full sized hurco mill with bx controls, 3hp with the vari-drive. I picked up a hitachi wj200 single phase input drive. Right now I am just using the drive as a phase converter and it is set at 60hz. Plan was to use the drive later when retrofitting the whole mill later. If I leave the brake on ( with bx control the brake automatically turns off when you turn on the spindle and on again after it shuts off) when the spindle goes to stop the brake grabs as it is ramping down and the CPU locks up. I assume it is the regen power from not allowing it to slow on its own. Don't use the brake and no issues, so I just don't use the brake. Well the other day I starting a job using aluminum and starting running at higher speeds. Not the vfd, that never left 60hz. I turned the vari-drive up to near max 4000rpm. When the spindle stops the same thing happens. I assume it is because with the vari-drive maxed out there isn't much drag on the spindle from the belts and the coast is longer. Anytime over 3000 rpm this happens and never under. There is an emi filter ahead of the drive and one ahead of the CPU power supply. Nothing between the drive and motor. Do I need something? Do I need a brake resistor for the drive? Or do I just need to adjust the parameters on the drive for ramp down or something else? Is this common with low end drives like these?
Thanks
Don

44
That is what I have just the tiny different between 6mm and 1/4". Right now the mill has encoders that are 1/4" the new encoders are 6mm. The existing couplings fit the 1/2" motor shaft and the old 1/4" encoders. My statement was if I replace the couplings I need 6mm x 1/2" if I use the existing one then just need to shim the difference. I can't find any couplings in that size, even on that site you recommended. I will just wait until Tuesday and stop at Msc and get a reamer. Sounds like the easy way to go.
Thanks
Don

45
I saw those love joy type, any issues using them for encoders? They are the only ones I could find with 6mm x 12.7mm.
Don

46
No the old encoders were 1/4" and the new ones are 6mm. The motor shaft is 1/2"name the existing couplings are 1/2x1/4 and about 1-1/4" in diameter. So with the couplings I saw I would need to open up a 12mm to 1/2" or shim my existing couplings. I don't have a 6mm reamer but could use a boring bar in the lathe or and endmill in the mill. I don't have a collet large enough to hold the coupling but could dial it in the 4 jaw. Instead of jb, would I be better off opening it up then bush it?
Don

47
Thanks. Never thought about epoxy. All the couplings I could find would require cutting one side or the other anyway. If you know of a source please let me know. If not I can pick up a reamer. How much luck do you think I would have using an 1/8" endmill and recutting in the mill, think the jb would pop? The encoders are 6mm and the motor shaft is .500"
Thanks
Don

49
I goofed and got my new encoders. They are 6mm and the old ones were .250". Before I order some new couplings, any way to sleeve them. A quick search came empty.
Don

50
General Mach Discussion / Re: CNC Lathe conversion with threading
« on: May 08, 2016, 08:50:24 PM »
C41

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