Steppers or DC motor for Z axis THC

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16 Jul 2020 13:36 #174847 by kramerda
Hello - getting ready to work on configure Linuscnc with Plasma - I have a working 3 axis plasma table based on PnvConf.
driving Mesa 7i76. No THC at present.
BUT - my z axis from a legacy machine has a floating head driven by a dc motor not a stepper. Is it
worthwhile to convert this mechanically to a stepper and get better control when using Mesa 7i76 +THC-10?
From what I've read Plasma C can handle the DC motor when configured as External. But I'm worried about
relays and delay times etc. causing issues. All comments well appreciated.

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16 Jul 2020 14:25 - 16 Jul 2020 16:24 #174850 by tommylight
Change it to a stepper.
DC motor will be to much trouble even if you manage to make it work, and if using relays there is no speed control, so the THC corrections will be very erratic.
Last edit: 16 Jul 2020 16:24 by tommylight. Reason: typo

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16 Jul 2020 14:37 #174852 by kramerda
tnx for your quick response - stepper it is
For those that are interested - this machine is only 1 month old - its
real nice mechanically (ArcBro Scout II from China) but the Fangling controller is 'delicate' and an intermittent short on one of the cabling pins took it out. Manufacturer refused to replace bad PCB. So here I am - so far thrilled with Linuxcnc and my own/manageable control hardware.
The following user(s) said Thank You: tommylight

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16 Jul 2020 16:28 #174864 by tommylight
Pictures ?

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