My supermax mill has both a vertical and a horizontal spindle.
Unfortunately the outboard spindle support for the horizontal spindle is MIA. I want to make one. I can pretty well figure how to machine a hunk of steel for the support (wish i had a hunk of grey iron)
What should I use for a bearing? Are these just a bronze or brass bushing? I think a timkem and race and housing is too large a diameter, it must be smaller than my cutters.
Karl
Normally they ( bushing ) are bronze or brass, with a tapered OD, and = are slitted once lengthwise--and they mount into a corresponding tapered = hole in the outboard support......usually, there is a key slot and pin = to keep them from rotating and there is also an adjusting nut that = serves to draw it deeper into the taper thus reducing the inside = diameter as the nut is tightened.
There will also be provisions for lubrication, toilet seat and wick, or = an actual hollowed out reservouir in the housing along with a bulls-eye = sight glass and fill plug.
In use, you want to adjust for a thousands or so of oil clearance, maybe = a 8little less but be careful--if you get it too tight or go without = sufficient lubrication then things can go to hell pretty quick.
You need a "sleeve" ( which is the name of the part that that mounts = onto the arbor itself ) for each arbor size that you want to run, IE one = with with a 1.5 hole, one with a 1-1/4 hole and so forth...
FWIW, it's even better if have a pair of supports....
"overarm support" + "milling machine" is probably going to be your best = bet so far as keyword searches are concerned....
Suggest leave final boring for the very last, and finishing in-place if = possible--install into the support and then, using a criterion type head = in the mill spindle and mounting it close-in, feed the entire overarm = towards the boring head by pushing it along with the table cross = feed....
THANK YOU. Very informative. Bit more to this than I thought. (There always is)
Karl
My small Vernon just has a brass/bronze bearing with a drilled-through oil passage. No adjustment.
This tip saved me time. I just picked up a unit to modify on ebay:
Karl
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