I have now welded the second side of the frame. I clamped it to the other side to get it flat etc:
I then tacked it together and welded the horizontal joins ... then rotated it and did the same etc:
My welding is getting much more consistent. Still probably should have chosen something simpler for my first welding project!
Now I have positioned the remaining pieces to work out how to proceed:
I decided to use some spacers from steel tube. I'll put a few more in and use them to clamp the in between pieces. Cats were interested...
Any comments / ideas welcome.
I think realistically another two weeks to get it running, and some more for it to actually be finished. When the frame is done I still have quite a few parts to make to mount the X and Y-axis ballscrews and rotating ballnuts.
Finally got the gantry mounted. Started making the aluminium plates to mount the X-axis bearings on 50mm wide, then realised it needed to be 60mm so that was a waste :sad: ... anyway, picture:
The important point is I now don't have very high gantry sides, so the machine should be much more rigid.
I spent all of today working out where to put these holes for the Y-axis ballscrew bearing mount:
Got it all together ... and it works!
The last photo was after cutting 3mm off the edge of a sheet of 18mm MDF in one pass at 6000mm/min.
Y-axis rapid speed is 16000mm/min, X-axis is 10500mm/min and Z is 8000mm/min. The Y-axis will do much more, but I've left it at that as I don't see much point having it twice as fast as the X-axis. I prefer to keep the resolution good...
I think I'll try cutting some aluminium now.
(More to follow shortly, + video)
Last edited by Jonathan; 16-07-2011 at 08:17 PM.
I tried cutting a sign ... the test one with V-carve:
I need to get a cutter which has a sharper point ... that one has a 3mm or so flat on the end which spoilt things somewhat.
Just tried cutting aluminium ... no problem! I put a bit of cutting fluid in the slot as it went round at 800mm/min, 0.85mm depth of cut with 6mm 2 flute HSS cutter @ 9000rpm. A lot faster than I could have used on my milling machine.
The edges are reasonably nice, still room for improvement but not bad I reckon for a first attempt. Next time I will add a climb milled finishing pass. Better than the milling machine...
I'm happy now that the conversion was worth it ... I always wanted the machine to be able to cut aluminium at a decent feedrate. I might try a relief with aluminium and ball nose cutter next.
Last edited by Jonathan; 17-07-2011 at 03:43 PM.
nice cnc you have there Jonathan are you going to paint it at some point ??
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