drive spins, shaft doesn't;also mach 3 question

[Ed_R]

When using TurboCNC running on a 486-50 , when accellerating to a slowish speed ( 50 ipm ) the drive motors will stop spinning the drive shaft but the drive will continue spinning. Wassup widdatN happens at any speed over say 40 ipm and on all motors even when not driving the threads.
Another issue-0when trying to run this controller with mach3 on a winxp machin, it can't see the controller attached to the port. Help?n

[Mariss Freimanis]

I assume the motor stops but continues to keep whining. That is a stall. The only cure is to use a higher power supply voltage.

If the motor makes a descending growling sound just before it stalls for no good reason at all then it's is mid-band resonance. The only cure is to use a drive with mid-band resonance compensation.

Mariss

[ger21]

Originally Posted by Ed_R the drive motors will stop spinning the drive shaft but the drive will continue spinning. Wassup widdatN happens at any speed over say 40 ipm and on all motors even when not driving the threads.

I don't understand what you mean here. Do the motors stop, but keep making noise? (losing steps or stall)

As for Mach3, make sure the port number is set for each pin, and make sure the port address is correct. Watch the setup and install video at www.machsupport.com

[Ed_R]

I'm guessing it's a 'stall', because it's working its way up to speed and then stops spinning the drive shaft, even if it's not under load. It just reaches a certain speed and it's like a clutch disengages. And when it winds back down and the clutch re-enganges, then it's rough and skipping.

So I don't have enough voltage running to teh motors? I have a 24 volt power supply and the VRef on teh Xylotecx board is the recommended 3.35 as per Jeff at Xylotec. I've measured the voltage at the input on the board and it's a straight good clean steady 24 V DC.

[Mariss Freimanis]

That's it. It's just like a clutch. The motor is giving its all at 24VDC; when it can't give any more at that supply voltage and speed demand, it dumps the load and stalls. Speed comes down to 3 or so revs per second, it picks up again. Good for the motor, bad for you.

Either increase the supply voltage or demand less speed. That is the reason some drives sport a much higher power supply voltage rating.

What is your motor's rated current, frame size and rated holding torque?

Mariss

[Ed_R]

Originally Posted by Mariss Freimanis That's it. It's just like a clutch. The motor is giving its all at 24VDC; when it can't give any more at that supply voltage and speed demand, it dumps the load and stalls. Speed comes down to 3 or so revs per second, it picks up again. Good for the motor, bad for you. Either increase the supply voltage or demand less speed. That is the reason some drives sport a much higher power supply voltage rating. What is your motor's rated current, frame size and rated holding torque? Mariss

The MOTOR spins at HIGH RPM during the stall, it's the driveshaft that stops spinning altogether, not 3 rps. There's no load issue, this happens when I'm just running motors with no threads coupled on.


This has happened on both a Pacific Scientific PowerMax 116-ounce motor and a Pacifgic Scientific 425-Ounce motor. These are standard NEMA-23 mounts, and I'm not sure where to look up the rated currents, frame size and rated holding torques.

What I wanted from teh new motors was a stronge r, steadier feed rate of around 70 IPM or so while under a mild load. I was assuming that the 116-ounce motors were stalling due to loads, but now that I've hooked them up without load and tested they do the exact same thing. So it' has to be voltage, but Jeff at Xylotec says these things should be running like achamp at 24 v and a VRef of 3.35.

[Mariss Freimanis]

Ah..The 3RPS refers to the speed at which things pick up again during deceleration. Once a motor desynchronizes, the speed must fall to 3RPS before it can pick up again. It might stall at 10,000RPM but it won't restart until it gets down to 180 to 200RPM again.

P.S. We test our new G203V drives to 10,000RPM now instead of 6,000RPM for the old G201 drives. Any G203V drive that can't take a motor to 10,000RPM gets a serious attitude adjustment.

Mariss

[Ed_R]

OK, the 3 RPS is the re-engage speed. That's maybe right, I didn't pay THAT much attention
I'm still confused though. Why's it happening in teh first plafce? My voltage readings say the voltage is right where it needs to be at 24 volts, and the VRef voltage is set to Xylotec's recs, and - still stalling.
If by 'serious attitude adjustment', you mean slamming it against a stone wall as hard as you possibly can, then I think this controller and power supply combination is headed in much the same direction

[GaryCorlew]

Hey Mariss got a video of the attitude adjustment?? lol

[Ed_R]

OK, now the 3 RPS speed makes sense- it's a re-engage.
If you 'attitude adjustment', you mean taken out back and slammed into teh brick wall as hard as you can, then this controller/power supply is headed in teh same direction.
All my reasdings say it's got what it needs, 24 volts and 3.35 vRef . I'm confused.

[Ed_R]

THis is getting insane- I'm now getting ads while I wait for one of my posts to post and it NEVER FRIKKING REDIRECTS!#!!!

[GaryCorlew]

50 ipm is not a slow speed for the xylotex motors / controller. I have them and I am using ball screws (.200) and linear rails and bearings, the best I can get is 60 ipm before losing steps