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Hey Tom,

I am having a weird issue now that I have the spindle set up like a servo. After running in either direction, the spindle is commanded to stop. Then is slows at the specified decel rate...

Hi Tom,

Thanks for the quick response. The only thing that needs to be done to reverse the direction is apply negative voltage. I just did a step response and it rotates the appropriate # of...

Hey Tom,

Shortly after I posted my last reply, I tore the spindle drive system apart and changed from an AC induction motor with a VFD over to an Allen Bradley AC servo driven system. The only...

Hey Tom, That did the trick, thank you. Would you be willing to explain the purpose of the VAR entry on the tool setup screen? And why it is needed in this application? I think I understand WHAT is...

Hi There,

am having some issues with controlling my spindle. I have a 3 axis (servo) knee mill with a VFD on the spindle. After getting the mill running properly and making parts I decided to...

I gotcha. I literally created that drawing in Windows paint. I was just trying to show where the problem areas were because I couldn't explain it well enough.

The main problem areas, on my...

The resolution on the X is a 1000ppr encoder at .200in per rev (so 20,000 counts/inch). I have rotary encoders and they are attached to the back of the motor.



I guess I don't fully understand...

Hi Tom,

I will post my Init C program so you can take a look at it (if you don't mind). I am not doing anything except motor params in it, and the Homing C program is pretty basic( I'll post that...

Hey All,

I am REALLY struggling with my Kflop/Kanalog build here. I finally got my motor tuning to place where I was happy with it, my init and homing code set up and my IO wired. Unfortunately...

Found them! Thank you for all of your help Tom. I really appreciate it!

Hey Tom,

Thanks for the quick reply. That is kind of what I figured, but I wanted to be sure. Would you just go download a couple arrow graphics and use those? Simply because the stock button...

Hello,

Has anyone run into this same issue? I have a 3 axis CNC knee mill so the table moves around the cutter (as opposed to a 3d printer or a router where the head/cutter moves around the part)...

That is really interesting. I am going to try to change that encoder to a brand new one then review the same plot and see if the issue (-1, -1, -1, +5) clears up. If it winds up being the encoders...

Tom,

I agree with you completely on the noise, I was really surprised also. I thought it was from being in the same liquitite as the motor power & tach but if the shield was properly grounded I...

Hey Tom,

The mill came with Dynamics Research Corp encoders PN#: 152-021-500-18UJ

I cant find much on them online anymore but the closest i can come are these: ...

I am in the middle of doing a 3 axis CNC mill retrofit with a KFLOP/KANALOG combo, I finally got everything moving and "tuned" so it appears to be extremely smooth but I can't seem to figure out why...