New CNC Mill on the horizon

[fvfdrums]

Also.....

Planning on using grub screws on the steppers at 90 degrees to each other. What size would people use on an 8mm shaft and a 10mm shaft?

[njhussey]

Also.....

Planning on using grub screws on the steppers at 90 degrees to each other. What size would people use on an 8mm shaft and a 10mm shaft?

Depends on the size of the pulleys I guess, I've used M4's on the 20 tooth pulleys as well as the 40 tooth ones. My 40mm pulleys are a push fit on the ballscrews so I'm hoping that's enough. Could always put a bit of loctite on too...

[JAZZCNC]

Depends on the size of the pulleys I guess, I've used M4's on the 20 tooth pulleys as well as the 40 tooth ones. My 40mm pulleys are a push fit on the ballscrews so I'm hoping that's enough. Could always put a bit of loctite on too...

Larger grub screws the better so can get good purchase on them, fiddley Grub screws are a pain and definately loctite the pulleys on. You'll never really want them off again other than to replace and certainly don't want them spinning on the shaft. Also mark them so for easy visual reference so can check they are not spinning.

[Boyan Silyavski]

I did like Dean says, larger grub screws. I also filed flat recess on shafts, where grub screws go. It was quite easy using small square file. It seemed to me it would help. Locktite also. In fact my major mistake on the first build was not using locktite on all screws. Result was from vibrations or whatever at least 2 screws difficult to access
loosened so i wasted some time tightening again all screws on my friends machine. On my current build i use Locktite on all screws and i hope all will be perfect long time after i am finished. Same goes for the supported rails. When all was mounted and square, i carefully poured locktite between screws and rails. later checked it, it worked. Then i fit the plastic caps.