horizontal mill bearing

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
Reply to
Karl Townsend
Loading thread data ...
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....
Reply to
PrecisionmachinisT
THANK YOU. Very informative. Bit more to this than I thought. (There always is)
Karl
Reply to
Karl Townsend
My small Vernon just has a brass/bronze bearing with a drilled-through oil passage. No adjustment.
Reply to
Bob Engelhardt
This tip saved me time. I just picked up a unit to modify on ebay:
formatting link
Its too short, I'll have to build a spacer block.
Karl
Reply to
Karl Townsend

PolyTech Forum website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.