Break In New Anti-Backlash Nuts

Community Discussion đź“„ General
1

I do notice smoother movement. Haven’t machined with them just yet, trying to break in my X with an “air file”. The RH 1/3 of my lead screw will intermittently stop the carriage. Have it moving at 100ipm for another 30 min. Didn’t expect that much tension/resistance from this nut. True, it’s bigger then the Y’s and the X.

1 of the nuts in my order got shorted on the machining, no slit on one side. Lucky for me my X used the big one and it was fully machined, really tight but fully machined. If you have a Longmill skinnier then 48" make sure they quality check your order on these nuts.

2

Still really tight on the X nut. I’ve got to move on and start cutting wood so I broke out my dry silicone lube.

3

I just got my 48 up and running recently.

For me - the X was the trouble maker. It didn’t initially want to run with the default rapids in gsender. Y and Z were completely fine.

After double checking the v wheels, I just entered some g code in the console to break it in. Started slow and ramped the speed up 50 ipm until I was happy.

Something like this:

G20 G91 X50 F100
G20 G91 X-50 F100
G20 G91 X50 F150
…
you get the idea. I think got it up to F400 or 450 and then it was fine.

I am using an SLB btw.

(yeah the repeated G20 and G91 are probably redundant but I was just copy pasting test into the command line to run)

4

Several hours with new backlash nuts, definitely smoother running. Can job on high and it’s quiet no chatter.

And finally shut off my hard limits in gSender. Don’t see anymore alarms.

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