Thread: Warco Major CNC build log
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11-04-2009 #1
Hi Irving it's Morse :D
I got the lack of travel nearly sorted today by angle grinder. Tested it with a loose Gibb, lost about 1cm with a tight Gibb. Can only be a few thou left to remove think I'll leave that until I need it an extra cm. Pics attached.
THE BIG BACKLASH TEST (this being the whole point of the exercise)
Put a DTI on the bed and turned the handle, by hand. I could feel the stepper motor cogging and with the 2.5:1 reduction the slide should move .01mm per clunk, 0.0004".
Well it didn't move that far when I sat there rocking it back and forth one clunk, but it did move a little bit so backlash is now <10 microns, not bad for 20 micron nuts
I totally destroyed one of the stepper motors while trying to remove the old pulley. I was thinking to replace them anyway with some of these new fangled hybrids.
RobinLast edited by Robin Hewitt; 11-04-2009 at 07:55 PM.
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14-04-2009 #2
I have just sent the picture for the Z axis screw machining to Gary and ordered a girt lump of aluminium.
The spindle doesn't like running at 5000 rpm which is top whack, 2500 rpm of the pulleys and 100Hz from the inverter, the bearings run hot. I would actually like twice that so I can run tiny ball end mills.
The plan is a false spindle set inside a 3MT soft end arbor and a lay shaft with two timing belts. That way the false spindle with it's ER11 collet can turn at 9 times the main spindle speed.
Give me something to do while I wait for the Z screw
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