Building My First CNC Router, Looking for Advice & Other Info

[Desertboy]

Hi Desertboy, your machine looks good, nice progress! I can now see why you did not tap the ends of the extrusion - what a f*cking nightmare! Fortunately KJN sent me two lengths of the incorrect extrusion that i quickly had a practice on, so the middle of the Extrusion is indeed a hole that is the correct size to tap an M12 thread in, HOWEVER as the diagram below, because the circle is within a square it makes it impossible to tap, once the thread has been cut into the circle material, it slips out and into the the 4 empty corners.



I think i will do the same as you and drive the bolt in to get the thread... I'm worried now that there isn't enough meat there to provide a strong connection.

In other news, my spindle kit, steppers, stepper drivers arrived. Just waiting on the PSU's, controller and some other little bits before i start mocking the machine up.

Alex

My profiles look different on the internal core.



Both my 4545 and 9045 have the same internal core

http://www.aluminium-profile.co.uk/a...20.html#SID=29

http://www.aluminium-profile.co.uk/a...KJN990300.html

e2a, Ah I see you have 4040 extrusion