I'm considering using 2.5A 0.9deg steppers for my Delta printer. Since current controllers cannot drive steppers higher than 24V and 2A I'm considering using TB6600 drivers (1/32 capable). Since steppers would be 0.9deg, driver would be set to 1/8 or 1/16 microstepping (32bit controller). I'm hoping to gain more torque at speed (up to 800RPM) while driving steppers with 36V and >2A compared to 24V and <2A I would get from Duet or Smoothie, for example.

Is there any reason why this should not be attempted ?

The TMC2660 drivers on the Duet WiFi and Duet Ethernet do up to 2.4A now, with higher to come in future, so these boards would be ideal for driving your 2.5A motors if you can get enough speed with the maximum recommended 25V supply. See [duet3d.com] to see whether 25V would be enough.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Quote
newbob
I'm considering using 2.5A 0.9deg steppers for my Delta printer. Since current controllers cannot drive steppers higher than 24V and 2A I'm considering using TB6600 drivers (1/32 capable). Since steppers would be 0.9deg, driver would be set to 1/8 or 1/16 microstepping (32bit controller). I'm hoping to gain more torque at speed (up to 800RPM) while driving steppers with 36V and >2A compared to 24V and <2A I would get from Duet or Smoothie, for example.

Is there any reason why this should not be attempted ?

No reason at all, if you want to drive truly massive motors you can do so with external drivers, by providing the step/dir/enable signals from whichever controller board you chose to use. That being said I would give Duet a +1 I can move my delta at 330mm/s travel speeds very convincingly at 24v. Of course I cant print that fast but fast travel speeds help reduce printing times. I figure your 800rpm equates to 533mm/s travel speed, assuming gt2 belts and 20t pulleys?

Edited 2 time(s). Last edit at 05/18/2017 04:05AM by DjDemonD.

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Simon Khoury

Co-founder of [www.precisionpiezo.co.uk] Accurate, repeatable, versatile Z-Probes
Published:Inventions

It'll be 12mm pitch lead screw therefore max travel would be 160mm/sec. I want to print ceramic as well so I figured I'll try screw drive first.