New STEPPERONLINE Integrated Servo motor

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dtananko
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Re: New STEPPERONLINE Integrated Servo motor

Post by dtananko »

Thank you, Scott. Your work is amazing! Really piece of art. Good suggestion about feed rate for Z axes. I will try this trick. What acceleration you suggest instead of 0.5? This number is really cryptic to me, I cannot make any real sense out of it.
I will study your thread and will most like come up with more questions. Your work and result are really inspiring. Thank you for sharing.
Best Regards,
Dmitry
suntravel
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Re: New STEPPERONLINE Integrated Servo motor

Post by suntravel »

Here is a document from HiWin about screwdrives, regarding acceleration and critical rpm.

https://www.hiwin.us/wp-content/uploads/ballscrews.pdf

On page 31 you can see the critical rpm for a 8mm - 1500mm screw with typical fixed-supported bearings is around 800 rpm.

Faster than this you will get vibrations.

So you should set up max. speed under 252 ipm (800x8/25.4)

For speeds under 800rpm a JMC closed loop servo will not outperform a JMC closed loop stepper which is easy to set up.

To be save with the ACME screws I would not use more than 200 ipm

Uwe
RogDC
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Re: New STEPPERONLINE Integrated Servo motor

Post by RogDC »

Sword wrote: Fri Jan 14, 2022 10:31 pm Next, and this is more for getting an opinion from the others here, but wouldn't putting ClearPath's on a acme screw driven machine be a bit much overkill? If you want closed loop, while not as sexy, how about a set of NEMA23 closed loop steppers/drivers. Although, it is fun spending other peoples money! :lol:
It probably is overkill, but if he upgrades the machine to ball screws later on or upgrades to a different machine he could reuse the ClearPaths and not spend his money twice.
suntravel wrote: Fri Jan 14, 2022 11:56 pm Here is a document from HiWin about screwdrives, regarding acceleration and critical rpm.

https://www.hiwin.us/wp-content/uploads/ballscrews.pdf

On page 31 you can see the critical rpm for a 8mm - 1500mm screw with typical fixed-supported bearings is around 800 rpm.

Faster than this you will get vibrations.

So you should set up max. speed under 252 ipm (800x8/25.4)

For speeds under 800rpm a JMC closed loop servo will not outperform a JMC closed loop stepper which is easy to set up.

To be save with the ACME screws I would not use more than 200 ipm

Uwe

200 ipm should be more than adequate for the 3D carving on your machine, as @Sword has pointed out 180 ipm is about the maximum speed for quality 3D Carving. As Sword has pointed out spend some time on the smoothing settings, When I was experimenting with settings on my machine, I ran multiple 3D carves on scrap just using different smoothing settings to determine what works best. They don't need to be huge or intricate, just with enough detail to make out the differences between settings.

It looks like you have good bones to get where you want to be with your machine as long as you understand the limits of the mechanics and design to the parameters of the machine for the best performance.
dtananko
Posts: 26
Joined: Sat Jan 01, 2022 3:44 pm
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Re: New STEPPERONLINE Integrated Servo motor

Post by dtananko »

Thank you, gents. You shared very valuable information for me that really explained the connection between motors and mechanical parts of the machine and gave me the basis to fine-tune it to its maximum ability. I believe the consensus is that I need closed-loop steppers as servos will not be able to reach its potentials due to my lead screws size and limitations and probably overall rigidity of the machine and its size. And I did not hear any vote for cheaper servos from JMC or Stepperonline. So, I will go with the set of closed-loop steppers (TS series) from Stepperonline. Also, I would be ecstatic to get up to 200 ipm (5000 mm per min) on my machine, as I currently run something around 100 ipm.
It is going to get a few weeks to get the motors in. I will be back to report my progress. Thank you all for your comments. Indeed, the wealth of knowledge in this forum exceeds any available info on the net.
Best Regards,
Dmitry
dtananko
Posts: 26
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Re: New STEPPERONLINE Integrated Servo motor

Post by dtananko »

Clarification question: based on lead screw limitation and for the closed-loop motor the top recommended working rpm is 800 rpm, that translates into 250 ipm, but what would be the suggested rapid movement without load (G0)? What numbers should I use in Acorn Wizard for max ipm on the axes?

Also, does anybody has suggestion to overcome Fusion 360 Hobby restrictions of G0 move?

Thank you.
Best Regards,
Dmitry
suntravel
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CNC Control System Serial Number: 6433DB0446C1-08115074
Location: Germany

Re: New STEPPERONLINE Integrated Servo motor

Post by suntravel »

250 ipm is the limit, regardless if milling or for rapid moves.

Uwe
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