Thanks for the clarification! makes me feel a bit better about having such a hard time getting my head around thisĪnd, last but not lease, I'm still looking for advice on the above open question so any comments would be welcome:Īny thoughts on the potential increase of resolution (from 256 to 533 steps/mm vs losing the round numbers for steps and having slower movement x16 interpolated to 256 is probably the best way to go. They measure the "pitch" as distance between the ridges of the same thread, which actually is the "lead" - axial advance after you turn the screw 360 degrees (1 turn). The pitch is the axial distance between adjacent threads. I find it amazing that Igus confuses "lead" and "pitch". x16 microstepping with interpolation (giving 256 in total) - is the right way to do it with the Duet? That is, the best way to get max resolution from the that is "lead". I hope it make sence, howevwr i have to say sorry for my bad english once again.Īm I correct in understanding that this way - i.e. Anyway, if you use 16x interpolated or 256x its kind of same for motor, but not same for processor calculations.
#Stepper motor resolution calculator driver#
Calculations for steps per distance are made in processor, so it use this 16 value, interpolation is made after in driver by splitting each microstep to 16 more steps again. They measure the "pitch" as distance between the ridges of the same thread, which actually is the "lead" - axial advance after you turn the screw 360 degrees (1 said in Help with Steps per mm Calculation:Ībove calculations use 16 microstepping because you wrote you use 16 interpolated.
One thing that still puzzles me is that the above calculations all seem to use 16, rather than 256, for the micro-stepping value - can anyone explain this please?Īlso, assuming is correct (which looks to be the case - thanks, any thoughts on the potential increase of resolution (from 256 to 533 steps/mm vs losing the round numbers for steps and having slower movement said in Help with Steps per mm Calculation:Īctually that is "lead". But i am sure by 25mm and 12 mm OP means lead then, not pitch.Īctually, I did mean 'pitch' rather than 'lead' - and I'm not going by what I know here (as I know close to nothing on this), but by the documentation.Īlso, notice that I didn't use the term 'lead', but rather 'number of threads', as this is what Igus use in their listing, although I do believe they mean the same thing in this context (looking at the current lead-screw, it does look it has 8 'starts', but that seems to be cancelled out by how the nut is made so the travel distance for 1 rotation is indeed 25mm).Ĭheck out the link I provided to the products' page on Igus and see what it says there, or if you prefer, here's a snapshot of the 2 relevant rows in the listing: That's a really interesting discussion and I think it illustrates perfectly why it tends to get my brain twisted up with all the terms, partly said in Help with Steps per mm Got it. The intended lead-screws are also from Igus: DST-LS-10x12-R-ES, and they have the following specs:Ĭould someone please help me calculate how many steps per mm would this lead-screw yield? and, for my education, how the calculation is done?ītw, I'd like to keep the 10mm diameter as my lead-screw nuts and the bearings are all for that size and I'd rather change only the lead screws themselves if I can. Now I'm considering going with similar lead-screws but with shorter pitch (yet also less threads), in the hope of increasing the resolution. With micro-stepping set to 256 (x16 with interpolation), this comes down to 256 steps per mm (I know it's right cause it works in reality, but I completely forgot how I got to this value). I currently have these high-helix lead-screws from Igus installed: DST-LS-10x25-R-ES, which have the following specs: My steppers are 0.9 degrees (400 steps per revolution).
This subject always get my brain in a twist so I thought I'd ask for some help
0 kommentar(er)
