Thread: my build
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02-08-2009 #1
supported rail and bearings , stepper motors arrived from zapp ( thanks gary) so i made up two carridges and mdf box (still to screw and glue ribs inside box) supported rail will be bolted to mdf box , box will be bolted to base . that gives me 200mm from base to carridge , should keep x and y axis close together
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02-08-2009 #2
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02-08-2009 #3
looking good !
.Me
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03-08-2009 #4
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03-08-2009 #5
Are you using 12mm studding or 12x3trapezoidal? A 12mm ID bearing will sort of do, but the fit will be poor. Better to machine the ends down to 8 or 10mm for a good fit on a suitable bearing and thread them for a locking bolt. have you considered how you are going to manage end-float?
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03-08-2009 #6
thanks irvine
using 12 mm trapeziod .. would the 2 grub screws in the pillow block not hold the screw against any lateral movement .... can the bearing take axial load ,.. was looking for a way round this as i dont have a lathe
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03-08-2009 #7
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03-08-2009 #8
Those type of bearings are poor at axial load, they can handle some but are not good for locating the shaft axially, which is what is needed to minimise backlash. Somewhere you need thrust bearings to take the axial load or angular contact bearings (hard to get in small diameter ID).
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03-08-2009 #9
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08-08-2009 #10
That's quite impressive - I've tried that technique before (although only turning the ends of bolts), and I wasn't that successful.
Mind you, I was using an electric drill as a lathe held in one hand, and the other hand holding the grinder I was also not really after precision (just wanted a nice chamfer on the end - it wasn't very neat, but did its job).
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