Quote Originally Posted by Boyan Silyavski View Post
200 steps per revolution will move the axis 10mm if using screw xx20 and if 1:2 as Dean suggested. so for 1mm -20 steps. But as you will use 1/8 microstepping, then 160 steps per mm. So 1/160=0.00625 resolution.
Boyan is correct that what I suggested gives same 10 movement per rev like 10mm pitch because of the ratio but don't be fooled by the micro step numbers because they are unrealistic in real world use.
Micro stepping is best thought of as way to increase smoothness not resolution. Yes the resolution is increased to some degree but not anything like the numbers suggested.

If you take it that Full step 200 is the minimum resolution then it's safer bet. What you actually get will be better but how much does depend on several factors like motor quality etc. If you work on calcualting using half the micro step used this will probably be more realistic figure.

Now if your going to use 2:1 ratio on the RM1610 ( I didn't realise you was doing this!) then whip won't be problem because the same apply's. Your screw will be spinning at half the speed than if 1:1 which is when whip occurs on 10mm pitch. Down side is that Max speed is halfed and with 10mm pitch this means for materials that require higher feeds you could struggle.

There are other factors that come into play which will dictate which way is best for you. The relation ship between Motors, drives, psu and Controller will greatly affect the kind of performance you'll get from machine.
Just saying I'm using 4nm motors (even if low inductance) isn't enough to determine overall performance.

For instance same 10mm pitch with 4nm High inductance motors with only 45v using Analog drives controlled by the parallel port with 25khz will perform much much slower than same size motors with Low inductance using 65v with Digital drives and Ethernet controller at 125khz. Upto half the speed.!!
Even if motors are low inductance the remaining factors still play big part in overall performance.

So this relationship between components affects how you go about it.

However I can safely tell you that on machine like yours if using 4nm motors with 65v with 80v digital drives and good motion controller, ideally Ethernet based that you will, provided build quality is to decent standard with good alignment of rails ballscrews etc with 2:1 ratio on 10mm pitch achieve 7500mm/min without too much trouble.


If using 2:1 on 10mm pitch gives what you require in speed terms then I'd go with 16mm.