Slide lubricant, bad alignment or not enough torque ?

[dazp1976]

[

Bigger is Better, right ?
Rob

Nope. Only with the right voltage.
However, if you can't get up to at least 1000mm/min with it then something is definately wrong.
What speed are you trying to run it at as a matter of interest?.

[Robinwales]

Nope. Only with the right voltage.
However, if you can't get up to at least 1000mm/min with it then something is definately wrong.
What speed are you trying to run it at as a matter of interest?.

I would be happy with 1000mm
Would like to carve some beech and cut some birch plywood
Not really bothered by the speed, would just like it to be automated
Thanks

[Cube3]

Is that some sort of IGUS bearing (sleeve) I see? It may be a replacement wear part or you my be able to find a IGUS bearing to fit.

Moving the slide without the ball screws should tell you quite a bit.

Gut feeling, with those steppers it's not the slides!

Sent from my SM-A715F using Tapatalk

[dazp1976]

Is that some sort of IGUS bearing (sleeve) I see? It may be a replacement wear part or you my be able to find a IGUS bearing to fit.
Moving the slide without the ball screws should tell you quite a bit.
Gut feeling, with those steppers it's not the slides!
Sent from my SM-A715F using Tapatalk

With the inductance on those steppers, they need DM860 drives and minimum 60v to get decent high rapid speeds.
Proven.
But, never any issue on 36v running at 300rpm with 5mm pitch ballscrews, and my gibs were tight as (mill).

[Robinwales]

With the inductance on those steppers, they need DM860 drives and minimum 60v to get decent high rapid speeds.
Proven.
But, never any issue on 36v running at 300rpm with 5mm pitch ballscrews, and my gibs were tight as (mill).

As mentioned, not really a speed freak just want to overcome the issues at the moment.
I would be happy with any speed that doesn't stick.
Thanks

[Robin Hewitt]

More might be better but I have just been playing with some dinky 5 phase steppers. They start out with a 0.8Nm pull out torque, sounds a bit limp, but they still have 0.25Nm at 3000rpm. 4 Amps 24 Volts. It's a different ball park

[Robinwales]

More might be better but I have just been playing with some dinky 5 phase steppers. They start out with a 0.8Nm pull out torque, sounds a bit limp, but they still have 0.25Nm at 3000rpm. 4 Amps 24 Volts. It's a different ball park

Thanks Robin that answer just went straight over my beginner's head lol

[Muzzer]

Also check the maximum step frequency and / or the minimum pulse width (similar thing). If you have it set too high frequency / too short pulse width, some of them may not get through to the driver. Try running at lower max frequency to see if this is an issue. I don't use steppers any more but last time I did, this was the issue causing me stalling / lost steps. Those settings would be in your controller, not the driver.

[Robinwales]

Also check the maximum step frequency and / or the minimum pulse width (similar thing). If you have it set too high frequency / too short pulse width, some of them may not get through to the driver. Try running at lower max frequency to see if this is an issue. I don't use steppers any more but last time I did, this was the issue causing me stalling / lost steps. Those settings would be in your controller, not the driver.

Please can you explain frequency ?
Thanks for the reply

[Muzzer]

Dunno what software you are using to drive the stepper drives but in the systems I use (LinuxCNC and Centroid), you can select the maximum pulse repetition rate for the steps. If you try to drive the stepper drives with too high a frequency, the input circuitry (usually optocouplers) can't process them consistently. IIRC, I've seen options for 100kHz and 200kHz, possibly higher (I don't recall right now).

The default for Centroid seems to be 200,000 steps per second (200kHz) and I know from experience that the Chinesium stepper driver I tried didn't work consistently with that until I reduced it to one of the lower settings. Have a look and see if you can see an option to reduce that in your system.

This is different to max velocity, as you may find the required step frequency to achieve max velocity is above what the driver can process, depending on your number of steps per rev, ballscrew pitch etc.