Apparent Step Errors MKII

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04 Jun 2021 11:38 #211147 by tommylight
At what speed are those cuts?
Check the motors for heat, if you can hold the palm on them=all is good, if it burns=lower the current on the drives.
To much current will cause missed steps and erratic behaviour.
Check after half hour of machine runing.
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04 Jun 2021 21:38 #211176 by samforsey12345
Have you tried drastically reducing acceleration?
The only other explanation I can offer is that the motors are consistently missing steps trying to accelerate the mass of that particular axis.

TB6600 drivers I couldn't get to play ball
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04 Jun 2021 21:57 #211179 by tommylight

samforsey12345 wrote:
TB6600 drivers I couldn't get to play ball

I do have some of them, one is OK for over 8 years.
The new ones sold on ebay/aliexpress/banggood are not using TB6600 but a new TBnnn109 <only recal this 109 at the end, they are lower current but much better microstepping and wont go up in smoke if someone sneezes near them.

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05 Jun 2021 01:10 #211187 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Hi Tommy;

Motors are OK to touch, warm but not hot.
I have included the cut speed in a screen grab.

Cheers

John
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05 Jun 2021 01:12 #211188 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
I'll get the LinuxCNC config later today and maybe you can give me some suggestions.

Many thanks

John

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05 Jun 2021 05:10 #211194 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Hi Sam;
I have included the HAL and INI file so you can take a look at the settings I am running.

Cheers

John
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08 Jun 2021 21:58 #211551 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Hi Tommy;

Would there be any benefit in reducing the current? If so I can try later today.

Rgds

John

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08 Jun 2021 23:52 #211564 by tommylight
Not really, upping it might help, but gradually, in small increments and check after each increase. It must be after at least 15 minutes of work.
Run a 2 to 4 hour job really slow, like 20 to 25% slow, but make sure to mark the start point and set the gcode to return to that point at the end.
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09 Jun 2021 11:02 #211610 by samforsey12345
Excuse the late reply.

I don't know what acceleration is necessary for your machine, but I would try reducing it drastically until you can hear it accelerating gently and there are no sharp movements.

Then repeat the test with the marker pen.

Sam
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11 Jun 2021 04:07 #211768 by jnwinkie
Replied by jnwinkie on topic Apparent Step Errors MKII
Thanks Sam;

It is a plasma unit and the highest cutting speed I have at the moment is 3048 mm/min or roughly 120"/min. The slowest is 305 mm/min or about 12"/min.
I am not a production shop more of a tinkerer. I try your suggestion and see ho I go.

Thanks

John

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