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(05-29-2013, 11:16 PM)f350ca Wrote: Stole a little time to work (play) on the plasma table rails/rack. The small flat between the bevels seams consistent, how would I measure it.
Greg, if you just want to verify the milled surfaces are equal/consistent could you use a small square and a small drill that would just fit in the triangle formed by the square placed against the milled surfaces.
BTW the finish you're getting on those milled flats looks beautiful.
Busy Bee 12-36 lathe, Busy Bee Mill drill, Busy Bee 4x6 bandsaw, Homemade 9x17 bandsaw, Ad infinitum.
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The following 1 user Likes f350ca's post:
Mayhem (12-03-2013)
Thats a good idea Steve, will give it a try, if I'm deep or shallow anywhere the gantry would move sideways, probably less than the resolution of a torch cut but can't hurt to check. The finish is partly the shiny camera at work, its good but to as shiny as the photo shows, cut it with a two insert indexable end mill.
The cutter is holding up really well Dave, I cut most of these teeth with only a couple of light dressings with a fine diamond hone. I'd cut a few teeth with a 1/4 cutter in a tool holder but was getting horrible chatter and the resulting digging in. The DRO works great, the scales on the Logan are useless, scribed on about a 1 inch cylinder. Just hope the error in these Chinese wonders is good enough, but I'm guessing as good as the accuracy I'd get from Chinese made racks. Now I need to CNC the shaper and let it do the repudiative work.
The vice gives good support Mayhem, but more important indexes the racks. I drilled and reamed the holes in the racks with a jig on the mill to give 8.000 inch spacing, must be close as I can flip one of the parts and still get the dowel pins through all three parts. The plates on the table have reamed holes 8.000 apart, after i've cut 8 inches of teeth I can index the racks on the dowels, move the table back 8.000 inches and rezero the DRO
Free advice is worth exactly what you payed for it.
Greg
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Finished the racks, 363 teeth.
Haven't figured how to measure them for overall accuracy but if I turn one end for end they mesh down the whole length, so at least they're consistent.
Free advice is worth exactly what you payed for it.
Greg
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12-10-2013, 04:05 AM
(This post was last modified: 12-10-2013, 04:06 AM by awemawson.)
Well if they are consistent, the actual accuracy isn't important as that can be accommodated in the scaling factor of the software.
Looks superb. You may already have covered this but if so I missed it, how many strokes to cut a tooth?
Andrew
Andrew Mawson, proud to be a member of MetalworkingFun Forum since Oct 2013.