Upgraded from a NEMA24 to a NEMA34.
Before going out and milling or buying it in metal it is always a good idea to testprint it.
Probably will use the plastic part for a while as 3mm wall-thickness PETG seems might already be good enough.
For us beginners in 3d printing.
What do the numbers in nema moters actually mean.
I recognise they go up in size/power. But being from the UK. And Nema being a US standard. I’d love a guide.
The number is the width/height of the mounting face in inches. So Nena 17 is 1.7inx1.7in on the mounting face, nema 23 is 2.3inx2.3in etc. though looking at datasheet for different nema sized mount that seems like an approximate not dead on number.
Shaft diameter and length is also part of it.
NEMA is just a mechanical aspect and contains zero information about the performance. Equally comparing motors by torque isn’t the full picture as the inductance (and other aspects) can be different. Equally important is the stepper-driver & supply voltage.
Yeah and as its mm when sold here. Unsurprising why I could not see it.
Thanks for the help.
So uh, if I can ask, why?
Like what are you doing that needs this kind of uh, upgrade?
Small CNC-mill. Previous 1.85mm NEMA23 wasn’t enough.
Oh, that makes sense. I was trying to mentally imagine what kind of FDM printer could possibly need that much power and was very much coming up with a blank, lol.
Compensating for something are we? /s
I see. Size doesn’t matter to you. It is all about skills.
Let’s me introduce you to the 400W NEMA24 servo.
edit: Sorry. Was only the 400W unit. Somewhere there should be a 750W speciment.
Also be careful with these motor. While a small NEMA17 found on 3D-printer has 0.5 Nm and under normal conditions will stall before serious harm happens this NEMA34 is 9Nm which is enough to break bones. Those 400W servos are equally dangerous. While only around 1Nm they have roughly 4Nm peak and keep this torque at high RPMs.
I’m sorry, I’m just insecure because I’m a small boi myself with a 8D shaft
Not bad either.
Previously I had a 1.85Nm on this axis which wasn’t enough to reliably pull 1’500 mm^2/s acceleration milling metal. All sort of issues from overheating stepper driver to it losing steps.
Yeah I used these in my manual mill converted to do power drive and some basic CNC stuff. They are excellent and have a lot of torque, but they are also very slow. Especially with the amount of step down gearing in a manual mill, the end result isn’t very fast. But I don’t really care, I’m usually not in a rush to do anything.
Print that in a CF filament and I bet it will last the life of the machine.
Depending on how hard you drive it about your only real failure risk is going to be failing in fatigue at higher temperatures.
Biggest concern for me is creep over time.
Thats why you go CF. It drastically increases the MoE of most plastics and they will not have nearly as much creep; you’re pulling mostly against the rigid fibers in the plastic matrix, and not loosely interlinked polymer bonds of plastic alone (which will disconnect over time and causes creep). As long as your service temp is not extremely high (>60C).
