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I made the arbor for the Malnar horizontal milling attachment that came with my Bridgeport lathe. Mr Bozo showed up... I didn't turn the arbor between centers. Instead, I turned and threaded the square/parallel part, flipped it around in the 4-jaw, dialed it in to less than .001 runout, and then turned the B&S #10 taper on the other end. I thought this would be good enough. Heh... When I put the thing in the B&S socket it shows about 0.013 total runout at the end far away from the socket/taper. Near the socket it shows less than 0.002 runout. So, it's bent or crooked or something.
However, I am hoping that not all is lost. I can spin the ram around 180 degrees, and there is already half of an arbor support there. I will build the other half of the arbor support... The arbor is 1.249 dia, and about 8" from taper to thread. I put a 0.998" dia stub on the outboard end of the arbor to interface with the support
So... my questions...
Will the outboard arbor support remove enough of the wobble to give me a useable arbor?
If YES:
1a) Should I use a bearing? OR
1b) Should I use a bronze bushing?
if NO WAY IN HECK:
2) Should I build an altar to Mr Bozo, sacrifice the arbor, then go turn a new one between centers while crying my heart out?
if I DON'T KNOW:
3) Is it a bad idea to try to see if it will work (risk/benefit analysis) ?
Thanks for your help
Dan
However, I am hoping that not all is lost. I can spin the ram around 180 degrees, and there is already half of an arbor support there. I will build the other half of the arbor support... The arbor is 1.249 dia, and about 8" from taper to thread. I put a 0.998" dia stub on the outboard end of the arbor to interface with the support
So... my questions...
Will the outboard arbor support remove enough of the wobble to give me a useable arbor?
If YES:
1a) Should I use a bearing? OR
1b) Should I use a bronze bushing?
if NO WAY IN HECK:
2) Should I build an altar to Mr Bozo, sacrifice the arbor, then go turn a new one between centers while crying my heart out?
if I DON'T KNOW:
3) Is it a bad idea to try to see if it will work (risk/benefit analysis) ?
Thanks for your help
Dan
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