I'm extremely pleased to have bought a older style Wolhaupter UPA3 boring facing head on Ebay for just under $300. Straight 3/4" shank. It was in pretty rough shape.
The action was extremely stiff with petrified grease. It needed significant cleaning. I did not need to completely strip every little thing to get it moving.
Turns out it had a damaged retaining screw hole internally. I had to jb weld the hole and drill and tap. It isn't under any real pressure so it should hold. If this doesn't hold I'll enlarge the hole a bit and press in a piece of steel I can drill and tap. The base steel laughs at hss...way too hard.
It was missing a 3mm bearing ball for the feed. The ball fits in the hole on the shank and engages the detents inside the ring. I ordered 1000 pcs of 3mm 52100 bearing balls for $10. Now I have 999 to use elsewhere...lol!
The adjustment ring was damaged from rust and some very aggressive wire brushing. Many of the lines were completely removed. HSS wouldn't scratch it but a cheap Chinese carbide scribe did the trick. The set up was a blast. I used my stepper controlled rotary table. The lines matched up perfectly when done. It took 3 passes to get the depth.
Today I finally got it running. It works very nicely.
It takes a bit of fiddling to realize that it retracts rotating the same direction as it feeds. Once the feed pops out against the stop, the retracting button can be pushed in while it's running and right back she goes.
The head can feed nearly the same distance both ways from center. When boring, the positioning of the clamping screws in the bottom holes would engage the boring bar flats if manually feeding in the opposite direction of the automatic feed. I don't know how many folks use it that way but it's an advantage over my old Taiwanese Intetstate clone boring facing head.
I'm extremely pleased so far. Any tips with this particular head are appreciated.
The action was extremely stiff with petrified grease. It needed significant cleaning. I did not need to completely strip every little thing to get it moving.
Turns out it had a damaged retaining screw hole internally. I had to jb weld the hole and drill and tap. It isn't under any real pressure so it should hold. If this doesn't hold I'll enlarge the hole a bit and press in a piece of steel I can drill and tap. The base steel laughs at hss...way too hard.
It was missing a 3mm bearing ball for the feed. The ball fits in the hole on the shank and engages the detents inside the ring. I ordered 1000 pcs of 3mm 52100 bearing balls for $10. Now I have 999 to use elsewhere...lol!
The adjustment ring was damaged from rust and some very aggressive wire brushing. Many of the lines were completely removed. HSS wouldn't scratch it but a cheap Chinese carbide scribe did the trick. The set up was a blast. I used my stepper controlled rotary table. The lines matched up perfectly when done. It took 3 passes to get the depth.
Today I finally got it running. It works very nicely.
It takes a bit of fiddling to realize that it retracts rotating the same direction as it feeds. Once the feed pops out against the stop, the retracting button can be pushed in while it's running and right back she goes.
The head can feed nearly the same distance both ways from center. When boring, the positioning of the clamping screws in the bottom holes would engage the boring bar flats if manually feeding in the opposite direction of the automatic feed. I don't know how many folks use it that way but it's an advantage over my old Taiwanese Intetstate clone boring facing head.
I'm extremely pleased so far. Any tips with this particular head are appreciated.
Good find for $300 .
