Thread: Warco Major CNC build log
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
To do that I need to make a 1/2" BSW drawbar. Can't make the drawbar because my 1 1/2" die holder has gone walkabout. Can't make the Z axis bottom plate 'til I know if I need to fit the layshaft etc.
However the Z axis screw has arrived and fits inside it's sleeve okay.
03-05-2009 #17Visit Us: www.zappautomation.com
Great minds think alike
The honking plate holds the screw square to the quill with minimum flex, I was thinking two 8mm pinch bolts at the back.
One vital feature missing in your picture though, probably early days and not forgot but still worth mentioning, you have to be able to release it before you hammer the chuck out of it's taper
I don't have any convenient flat to bolt a plummer type bearing mount to so I have to extend the sides of the quill housing forwards. This is almost convenient because it ain't easy to get a precise measurement for the separation 'twixt spindle and screw, I thought a bit of slack before I drilled the fixing bolts wouldn't be a bad thing.
Back again and cutting metal...
Going for the larger stepper motor this time with half the pulley reduction to put me in the power band. 1 rev = 4mm, half step = 10 microns.
Same pair of angular contact races with the Belleville washers holding it in tension as before.
The front of the mill is to extend forwards with bolt on cheeks. The bearings are set in a 16mm plate which fits into grooves in the cheeks to hold it square and rigid.
The ball nut is enclosed a la Kip, the bottom of the housing is wider to take a pair of 8mm set screws which tie it to the spindle, or not, as the case may be.
Next job, fitting the cheeks so they wedge tight in the ironwork
I don't really do 'excited' anymore
I think I have to fit this top section then fudge to connect it to the quill.
Once it's all bolted together and moving I can measure the fudge and get precise dimensions for the honking plate.
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