Need help with ordering new to duet…
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Z axis on cartesian/CoreXY printers don't tend to need to move quickly so the acceleration required (and hence the torque) is lower than for X, Y.
If you want auto bed levelling then you need a suitable probe, and 3 z motors is the best choice. If you don't want to auto level your bed then a single Z motor with belts/gearing may well be the best solution.
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I just ordered 4xnema 23 and 4xnema 17. I also ordered the 4 Acme rods an enough belts and pulleys to mess around with different setups till I find the best one. Is there pre-writen firmware for a corexy and the duex5 or do I have to build that from scratch/
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If the bed plate and frame are sufficiently rigid then 3 stepper motors would be better. Use 4 only if you can't make it rigid enough. I suggest Nema 23 motors rated at 2.8A or 3.0A for the Z axis.
I thought the max amp on the board per stepper was 2.4A?
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Can you share the design? - I am considering building something that size
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I am making a guide video along with all that supplies needed and where to get them. As soon as I am done with the build and get it working I am going to release everything. My build is on the pricey side but there are no crap parts, I only used the best that i could find. I think in total I will have about 3-4K into it but I was sick of these junk kits that you buy. shoot me a Email at m.hallett@ymail.com and as soon as I get it all together I will email it to you.
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If the bed plate and frame are sufficiently rigid then 3 stepper motors would be better. Use 4 only if you can't make it rigid enough. I suggest Nema 23 motors rated at 2.8A or 3.0A for the Z axis.
I thought the max amp on the board per stepper was 2.4A?
It is at present; but stepper motors that are run at their full rated current get very hot, so it's normal to run them at no more than 80 to 85% of their rated current.
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I just ordered 4xnema 23 and 4xnema 17. I also ordered the 4 Acme rods an enough belts and pulleys to mess around with different setups till I find the best one. Is there pre-writen firmware for a corexy and the duex5 or do I have to build that from scratch/
You don't have to build firmware for the Duets yourself unless you are doing something very unusual. Instead you use https://configurator.reprapfirmware.org to generate configuration and homing files, and you transfer them to the SD card. See https://duet3d.com/wiki/Configuring_RepRapFirmware_for_a_Cartesian_printer and https://duet3d.com/wiki/Configuring_RepRapFirmware_for_a_CoreXY_printer for more detail.
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I just ordered 4xnema 23 and 4xnema 17. I also ordered the 4 Acme rods an enough belts and pulleys to mess around with different setups till I find the best one. Is there pre-writen firmware for a corexy and the duex5 or do I have to build that from scratch/
You don't have to build firmware for the Duets yourself unless you are doing something very unusual. Instead you use https://configurator.reprapfirmware.org to generate configuration and homing files, and you transfer them to the SD card. See https://duet3d.com/wiki/Configuring_RepRapFirmware_for_a_Cartesian_printer and https://duet3d.com/wiki/Configuring_RepRapFirmware_for_a_CoreXY_printer for more detail.
Thanks for all your help, the only ting I am doing differently is moving the xy gantry for the z insted of moving the bed. So I should be all good as long as I reverse the z homing movement.
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If the bed plate and frame are sufficiently rigid then 3 stepper motors would be better. Use 4 only if you can't make it rigid enough. I suggest Nema 23 motors rated at 2.8A or 3.0A for the Z axis.
I thought the max amp on the board per stepper was 2.4A?
It is at present; but stepper motors that are run at their full rated current get very hot, so it's normal to run them at no more than 80 to 85% of their rated current.
So if I run 3 steppers would it be two in the back direct drive to the Acme rods and one in the front with 1:1 gearing to the two Acme rods in the front using belts and pulleys?
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What we are saying is to only use 3 Acme rods that way you can't twist the bed which is what commonly happens if you use one in each corner think of a 4 legged stand as opposed to a camera tripod which is the most stable
