Determining Angular Scale - Help w/ Microsteps

Your driver is obviously broken.

So like changing switches #1-4 does nothing?

Does the output feel different?

Try out the debug port.

Maybe it can lead you to the bottom of this strange behavior.

Changing from F to 0 the output changes. The motor shaft is shaking as it doesnt have enough torque to spin the pulley. This is true until i get to 8. On 8 it comes alive and spins as it has been. The output seems to improve as i move past 8 but i have no data to confirm this.

I have the debug cord but once i get into the menus i have no idea what i am looking for.

update.

I took the motor out just to see if i could get it to reliably spin one revolution. With all the dip switches set to default that number is 1600. And i think i just had a brain blast because switching to the 1600 doesn't change it.

Also conveniently 1600 / 3.12 (the pulley ratio) is 533.3333 pretty close to the 540 number,.

I am going to throw it back together and verify.

I demand a recount!

(of the cog teeth on each pulley)

Here's a fool-proof counting method: Mark one cog with a big mark of a Sharpie.

Then, count each cog around the pulley, leaving a little dot with the sharpie each time you count to make sure you don't accidentally count the same one twice.

Use the number of points to determine the ratio.


Why does the number of microsteps not affect anything?
That's totally impossible!

Big pulley count - 60 and 20 for the small one.

The point about the micro steps is messing with me too.

I put everything back together, changed the value to 533, the closest i could get with an integer and it works. It does a full revolution but after 5+ you can see the error propagation. Same behavior with dip switches on default and set to 1600..

is this just something i'm forced to deal with using the PID once i move it to LCNC?

Th

I think the driver is just busted.

60:20 = 3:1

600 is correct.

Does the motor buzz or move differently with 1600 steps/rev vs. 200 steps/rev?

Good thing drivers are insanely inexpensive these days.

The pulley ratio is 3:1

Why would it be 3.2:1?

60:20 = 3:1

youre 100% right, not sure where i got 533 from.

I set it to 600 and its still over shooting. Probably about 1.125 rotations again.

I am having trouble believing its the driver because with the 1600 it works perfectly and repeatable (not sure that's a word). 

Maybe i need a sanity check on the layout of the belt system (simple diagram) attached. I dont think the tensioner (idler gear) makes any difference in the belt ratio calc (shout out uni for that one)