This to me looks like work holding, or tool holding. See how the work has been pulled up where the vertical lines are. That’s usually a sign that something’s moving. I’m surprised the end mill survived. Does the tool length match after a cut like this?
I think its a servo issue. I am contacting clear path this week. Tormach gave me some updated servo files but that didnt make any difference.
3/8 long cut shouldnt cause this problem. Im not running fast or aggressive. If anything it shouldnt come out to size properly. I have to wait a week for the YG1 to get here.
Nothing is moving. EM length checks out. There is a bump/thump sound when it happens which sounds like a servo fighting for position. But when I run a standard length EM I can run it hard and have no problem. There is something about this end mill that I cant explain. If yo notice the floor where the bumps are at its half mooned, like there is deflection from a sudden bump. Like the servo is pushing back into position. This happens in both the X and Y direction but much more often in the Y. Which in my mind makes some sense if it is a servo problem. Tool pressure has to overcome the motor, the weight of the carriage and table in the X direction. But only has motor and table weight when in the Y direction.
I suspect the YG1 will have the same problem.
Thats interesting what you said about the dome where it bumps…. Possibly the cheap EM is not ground properly on the bottom and aluminum builds up on the end of the EM and then sheds where bump occurs
Just a thought
Maybe but I doubt it. Ive used this end mill for awhile never had an issue till I used it in the 1100mx.
What ive noticed…
If the machine is idle and the table is in the middle of the travel. I can grab the table & pull it towards me in the Y axis direction. I have to pull quite hard before the servo fights back. I am surprised i can pull hard enough for it to fight back, but I got pull with a lot of effort. If go to the side of the machine and push or pull on the table in the x axis direction. I dont have to put much effort into it before the servo fights back. Surpisingly little effort in my opinion. I know servos dont have hold power like steppers, but again i would think youd have to really try to get them to fight back. But for the x axis, its not that hard.
To hear you can run 1/2 em long, at 120ipm, 0.03woc. Im shocked by that.
I’ll be making some parts tomorrow I’ll make a video
@brian_satterlee it worked fine for me. I introduced it into the programming once the 3/8” EM with 1” LOC ran out of depth to minimize wear on the new EM so I could bore 1.5” deep. I used the same cutting parameters (both are no-name DLC, two different brands) for 0.25” DOC as the shorter EM but shallower passes when it full DOC to finish. Nothing out of the ordinary but it was a short cycle on a 440.
My 440 has no problems with the long no name em as well. My 1100mx, has a problem.
::::::: SOLVED. ::::::
As I expected it was a servo problem.
In a previous post I mentioned how I can grab the table with the machine idle, push or pull to get the servos to fight back. Y axis is far more difficult than the X axis. Id expect either axis to be unlovable by hand. But they are not. I can get X & Y to fight back with enough brute muscle.
I figured I adjust some setting in the servos to try & get more holding force. After the adjustment I CAN NOT get the table to move & the servo do not fight back. I took a test cut with my cheapo em. No problems!!!
I would be curious what the config files look like for other people’s 1100mx. I have a 2020 model and perhaps the settings are conservative or not well tuned. I have a background in control systems so poking around with this sort of thing doesnt bother me. The msp software from teknic is pretty easy to use. I did not do a full autotune because I dont have 500lbs to put on the table to properly run an auto tune. So I gotta figure tweaking original files are as good as I will get unless someone shares their config files from a newer machine.
Perhaps I will contact clearpath this week and get their take. But without a fully loaded table, I think the autotune will be lacking.
Im not sure why I have this problem & no one else seems to have this problem. I have some more testing to do. But the big problem is certainly solved. Now I can start to fine tune things.
I just saw your reply that you found it was the servos…great news…
I was about to send the below, which may still sort of apply and this line of thinking may be helpful for others in the future…
Where my mind goes for your issue from software and other troubleshooting is a “self-test” or some sort of validation part that removes the complexities of your specific part.
I looked in the Tormach manual and the only thing in there is a piece of wood as a validation / first part post machine assembly/commissioning.
Is there something else in terms of a metal part (because wood may be a challenge for an xsTech but not for a 440 on up) that’s a validation part that can be run to validate a machine’s performance?
I’m also asking for myself because my 440 is second hand and I’ve checked different things over time but have not taken it down to do a complete full exhaustive “service” to pull everything apart that can be pulled apart and adjusted by the end-user because nothing I make really needs to hit super-tight tolerances.
I guess I could try and sign up for Xometry and see if I can make their validation part but in my case, it’s not just testing the machine, it’s testing my abilities as a hobby machinist of only 2 years with a 440. I guess I could sign up and let CloudNC or Toolpath do the CAM for me and see if my 440 can crank out something that passes…
The 440 can pass the Xometry test. I passed it on the first try with a 440. It will take a while and extra steps will need to be taken to get to their dimensional requirement but it can be done.
I recommend you make sure your probe is calibrated & you trust it. That way when you cut the feature you can probe it and trust its dimensions. That way you know how much to take off with the follow up cuts.
Took a few minutes to sign up to get access to the test part but their signup form is broken and fails on the last step (providing them with a W9). 
I would imagine the lack of climate control in the space must explain how I don’t drop or otherwise manhandle my probe (wireless but not stored in the ATC for now) but I have to regularly check and readjust concentricity.
I guess a mini-split heat pump for the space would have to go on the lists of general upgrades for the current space (or the equivalent in considering a new space for it).
So Brian, wht did you do to the servo? Increase torque or something?
Not familiar with servo tweaking.
I changed the holding torque. The tormach setting, in my servos at least, were set to 5%. That means only 5% of its assigned torque limit is used to hold position. I raised it to 30%. Now I cant physically move either axis by hand. And after test cuts I had no problem with servo fighting tool pressure. I didnt set this to 100% because they will get hot over time & could have a thermal fault. But at 30% the motors never got warm to the touch after 1 hr of being energized and a few test cuts.
Im not advocating you change the settings. I want people to know there is room for tuning changes with these servos.
My guess is newer 1100mx servos probably have better tunes. But I could be wrong. But based on a lack of complaints….. Seems logical
I would like to see servo config files from a 2026 buold vs my 3/2020 build. Go give your table a shove & pull. Reset the machine, reference all axis. Then put the table in the middle of travel x9y-5.5 and pull on the table in Y direction and see if the servo fights back. You will hear and feel the bump(s). Then go to the side of the machine & pull on the table in the x direction again see if the servo fights back. Mine didnt require much effort to get the servos to fight back. Now i cant physically budge the table or get a servo to fight back. It feels locked in place.
Cool you figured it out. Once you said it wasn’t squealing I figured it wasn’t chatter and something else was going on, but had no idea what it might be.
The bump/thump sounds like servo fighting for position. I was pretty sure from the start. I was hoping others had the issue so I would have some validation.
I glad you got it figured out and have the knowledge to adjust those settings
I tried to up load a video but it wont upload to the forum
Here are the parameters of the roughing profile cut I was talking about in 1” x 4 x 7 6061 AL
0.920 DOC - 0.025 WOC - 9000 RPM - 120 IPM - 0.044 FPT
I had thought I used a WOC of 0.030 I was mistaken
Ed
Nice! Makes sense. I have an older 15L lathe, and unknown to me, X axis didn’t have a brake on the stepper. Replaced it, along with several repairs, it now is repeatable to half thou most of the time.
Could you post something on how to do the torque change?
Tried the push pull on X and Y, seems solid on 770MX. Gibs are all toward snug side. I did increase pressure on Bellville washers a year or so back. I can interpolate a hole to within 1 thou, spring pass to right on. X Y backlash set to 2 and 3 tenths respectively. Z 1 thou.
So while I don’t have any problems with alum, brass, no carbon steel, I could see a need with SS or tougher mat’ls.
So is there a reason that the servos come tuned to 15% holding and not more or less? I’m guessing there all kinds of other curves attached to this function that require consideration. Also does it improve resolution at all?
They came at 5%.
So far with the new setting of 30%, there has been no adverse affects. Now I can actually make cuts with DOC over 1” no problem.
Im still working on tuning and seeing what affects changes have.