5i25/6i25 bitfile for DMB4350-8B bob

0jw
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12 Feb 2021 22:54 #198603 by 0jw

Replied by 0jw on topic 5i25/6i25 bitfile for DMB4350-8B bob

in the dyn4 drives you can set the steps per rev to get the most out of the motors. for this i have it set to 2000 steps per rev. the highest i can go in motor steps per rev in pncconf is 1000

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0jw
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12 Feb 2021 22:58 #198605 by 0jw

Replied by 0jw on topic 5i25/6i25 bitfile for DMB4350-8B bob

I tried doing this and it made 20 revaluations.

forum.linuxcnc.org/39-pncconf/29302-pncc...steps-per-revolution

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PCW
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12 Feb 2021 23:02 #198606 by PCW

Replied by PCW on topic 5i25/6i25 bitfile for DMB4350-8B bob

I would just enter the step scale directly in steps/mm or steps/inch

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0jw
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12 Feb 2021 23:19 #198608 by 0jw

Replied by 0jw on topic 5i25/6i25 bitfile for DMB4350-8B bob

doing this 1000 will give 1 rev

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PCW
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12 Feb 2021 23:29 #198610 by PCW

Replied by PCW on topic 5i25/6i25 bitfile for DMB4350-8B bob

I would ignore the calculator and just enter the number of steps per machine unit

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0jw
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12 Feb 2021 23:34 #198611 by 0jw

Replied by 0jw on topic 5i25/6i25 bitfile for DMB4350-8B bob

I tried this and it gave the same result. I checked the servo drive firmware and it still set to 2000 per tation. It might be something I'm missing in the drive.

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PCW
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12 Feb 2021 23:37 - 12 Feb 2021 23:38 #198612 by PCW

Replied by PCW on topic 5i25/6i25 bitfile for DMB4350-8B bob

1. What is your screw pitch?
2. Are the screws directly driven?
3. Are you using mm on inches?

Last edit: 12 Feb 2021 23:38 by PCW.

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0jw
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12 Feb 2021 23:44 #198615 by 0jw

Replied by 0jw on topic 5i25/6i25 bitfile for DMB4350-8B bob

The screws are 5tpi direct drive and pncconf is in inches. Although the machine will be used in mm. I have one of the motors off the machine for testing

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PCW
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12 Feb 2021 23:47 - 12 Feb 2021 23:54 #198616 by PCW

Replied by PCW on topic 5i25/6i25 bitfile for DMB4350-8B bob

OK if the motor has 2000 steps per revolution and you are using a 5TPI
screw, the step scale is 2000x5 = 10000 steps per inch

If you wanted the basic machine units to be in mm, the
step scale would be 393.70079 steps per mm

Last edit: 12 Feb 2021 23:54 by PCW.

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0jw
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13 Feb 2021 00:06 #198620 by 0jw

Replied by 0jw on topic 5i25/6i25 bitfile for DMB4350-8B bob

I'm not sure what's going on but for some reason I've never got motion when it's been set in millimeters

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