05:50 <Noxz> anyone know of a 360 step (or 720) non-geared stepper motor?

05:52 <nmz787> hmm, isn't there some standard naming convention that should allow you to easily search this?

05:53 <nmz787> has been years since I've dug into steppers

15:41 <jesseg> Noxz, wow thinking back over the hundreds of steppers I've seen in my life, I only remember seeing things like 50, 100, 200, 400, and 800

15:42 <jesseg> although I wonder if some of the 3 or 5 phase ones may have had different step counts

15:42 <Noxz> 180 exist

15:42 <jesseg> oh then just half step :D

15:42 <Noxz> is that accurate?

15:43 <jesseg> I mean in theory, any multiple of 4 is doable for a 4 phase stepper

15:43 <jesseg> half stepping is pretty good.

15:43 <Noxz> yeah, not like I am microstepping 32 parts

15:43 <Noxz> my cnc controller does do 32 micro steps iirc (smoothieboard)

15:44 <jesseg> I mean, steppers aren't that accurate. In any step position there is bounce. Even on a fullstep, you can pull the motor and there's a little slop on the top of the curve if you know what I mean.

15:44 <jesseg> like the top of a sinewave - the top is at the very tip flat. or almost flat. likewise, it doesn't take much force at all to pull a stepper a little ways off of dead center of step

15:44 <Noxz> sure, trying to get 1 arc second accuracy can only go so far, there is likley going to be stick&slip w/ the mechanical side of it anyways

15:45 <jesseg> but half stepping is much better than a quarter step because at least you're running equal current through equal turns and it works pretty good. When you start trying to microstep, you have to take in to account the non-linearities of the motor because you are running different currents through different coils

15:46 <jesseg> in other words, 66.6666% and 33.3333% electrically may not be exactly 2/3 & 1/3 mechanically due to the shape of the iron in the motor.

15:47 <jesseg> But 50%/50% should be 1/2 and 1/2 mechanically because it's all equal

15:47 <Noxz> ah.. I honestly haven't dealt too much with steppers and whatnot.. I had my smoothieboard fo ryears before I even tried using it a few months ago on my big ol steppers

15:48 <jesseg> My advice is use the finest step motor you can, and microstep it :P

15:48 <Noxz> I like being perfectly divisible though

15:48 <jesseg> as the steps get smaller, so does the magnetic sloppyness

15:48 <Noxz> hrm

15:49 <jesseg> perfectly divisible is only an idealogical phantom. When it goes to a stepper, it's never twice in the same place, and the larger the steps, the larger your dimension of unknown

15:50 <Noxz> noted

15:50 <jesseg> an 800 step motor microstepping would get much much better accuracy and repeatability than would a 360 step motor fullstepping.

15:51 <jesseg> unless you had perfectly zero drag bearings and everything and no load on the motor :D

15:52 <jesseg> now if you need high speed, then you may not be able to get away with a higher step count stepper unless your smoothie board runs a high enough voltage....

15:53 <jesseg> so that's the balancing factor :P

22:55 <berndj> Noxz, i have a stepper from a 1980s hard disk that's 400 steps per revolution

23:02 <inode> i've seen a few 0.9 degree steppers in XY-plotters from that period

23:04 <SpeedEvil> I have a barrel full of them in the garden.

23:04 <SpeedEvil> (with assorted others)

23:37 <Noxz> 400s/rev is easily obtainable from searching..

23:37 <Noxz> but the question of holding at a degree I want well or not