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Discussion in 'CNC Mills/Routers' started by that-jim, May 2, 2020.
Machine based on Sphinx 55 built with linear rails.
that-jim published a new build:
Read more about this build...
Hi, I was wondering how is the cnc machine build going? I was curious if you have got it going to notice if the MGN12 alignment block for the rails works good or you do think you still have to use dial indicator?
Corey, well... it is going kind of slow. I did get all of the hardware for attaching the rails and they are now on. At first I tried a 3d printed guide for rail alignment but was not satisfied with the result. So I made an aluminum block that I bolted to the extrusion, this block has an adjustable screw for setting the rails. like this, there are t nuts holding it on so you can push the rail against it then snug down the rail
This worked very well, I did check the rails with an indicator afterword but they seemed perfect. I think this measuring step is not really necessary but it was reassuring to confirm that my alignment jig worked.
Once I set and tightened the top rail I loosely assembled the bottom rail, side plate and rail blocks. Then I slid the side plate back and forth and snugged up the bottom rail and blocks. I figured that this would align the bottom rail to the top rail and as far as I can tell it did the trick.
That aluminum block and screw are brilliant. I was just trying to come up with something to do the same thing, but you did it for me. Awesome! thanks.
Good idea! Thanks for sharing. I was a little on the fence about 3d printing the guide but I was gonna try it. Only reason why is I know my 3d printer. And I figured I print it up and something would be off. But I like your idea better. Glad I asked, I am still sourcing parts so haven't got my rails yet. I have had to redo
Z axis plate so machine is apart right now. But as soon as I can cut aluminum reliably I plane to make some plates and upgrade to rails system or just start another bigger machine. Thanks!
Nice update! Machine looking good. I also like the thrust bearing and washer Idea! Did you push the motor drive coupler just snug?
Thanks Corey. Yes the motor coupling is 'just' pushed against the thrust washer. I have cut a few projects with the machine so far and everything seems to be working well.
M3 t-nut for attaching rails where you ordered ?
do these fit?
Machifit 50pcs 20M3 T Sliding Nut M3 Slot T Nut for 2020 Aluminum Profile Machine Tools & Accessories from Tools on banggood.com
Those should work, they look exactly like the ones I used.