A couple times now I have gone to set my spindle to like 1000-1500 rpm only to have it briefly hit an RPM that sounds like it is in excess of 5k rpm. Has happened 3 or 4 times.
Twice I wish I had worn my brown pants when it was my fly cutter installed and the machine decided to go plaid rather than the 1500 rpm I told it to do.
Hit stop on cut control. Then restarted it and it was then fine.
Had anyone else had a similar issue? I am considering doing a test RPM without collet/chuck every time I power the machine up from now on.
Can we have some details on the motor and what drives them for spindle speed control? I am wondering if there a bug that could cause some issues in the future. If this is a brushless motor I am wondering if a speed controller is causing a hiccup, but I have not heard noises that indicate I may be dealing with a typical ESC and a brushless motor.
Yup! I’ve had the same thing happen to me as well! Its pretty annoying. My bandaid fix is to override and reduce the rapid and spindle speed upon starting. Once I know its fine I’ll ease the spindle speed back slowly. I’ve had the same thing happen when linking tool paths mid cut. If anyone has a better solution I’d love to hear it. Perhaps its F360 setting?
This is very strange and of course not normal behavior- we’re going to look at the code first thing tomorrow morning to figure out a potential cause. Haven’t not seen or heard about this before.
Literally manually entered an rpm of 1500 into the box then clicked “spindle on”
The RPM is insanely fast. Think one time it corrected itself but the other times it was me hitting stop manually.
I have experience with ESCs in brushless motors in drones and this makes me wonder if there is a desync issue where something happens if motor is between poles or something is going on with pulses.
If the motor is not a brushless with an ESC then disregard that comment.
That is a weird problem. I have seen similar issues working as an automation engineer in manufacturing. The first thing I would check is any potential interference caused by grounding issues. If your machine is on casters, I would make sure the frame is grounded. Believe it or not, if you are in your shop with electric heat, AC and or something like an air compressor that kicks on, then that surge can cause your servo motor do weird things. I would also make sure that your line and load side of your power disconnect are good and tight.
According to Langmuir, the Spindle is designed to work off Torque. If the controller is not interpreting the proper torque for the job, then the speed and the power will be effected. This certainly could be an error in the G-code file generated from the software you used or how it is being interpreted by the control software. I would check external issues first including cabling and the routing of such.
It’s possible that a previous spindle override code is still set when powering the spindle on. I would recommend hitting the reset button in the center of the override menu ( if it doesn’t appear to be overriden on the software) before turning your spindle on to see if this changes anything.
Also, the VFD is constant speed control not torque control. The control signal for speed is isolated so noise is unlikely to be an issue here.
I would guess that there is probably a cabling issue, grounding issue or a software issue. Not much help, but… I would suggest doing a dry run without any bits so you don’t destroy anything. Run a couple different programs to include a 2.5 D carving. Make them long enough so it has time to mess up…or not. This may tell us something.
Mike from Langmuir posted something so I would check that as well.
I have several dozen hours on the machine so far having done test parts.
Heavy/unbalanced bits like fly cutter seems to be the problem.
Good cuts and honing in on within .001 of drawing spec for 1/8 through .375 end mills so far.
The lego block is my 4th part off the mill as making test cuts. Other parts were 40k+ lines of code while doing rotations of a part testing for accuracy of my set up process on aquiring an edge/zero.
The motor issue is not a mid code thing. It is a motor spin up with something heavy or out of balance thing. Have not seen issue with a balanced cutter like an end mill.
