Step pulley oiling screw problems

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3Dirk

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Really having a difficult time with an oiling set screw on a 14 1/2" x 60" SB lathe. It's located near the center of spindle step pulley. Tried heating, freezing, impact driver, and two kinds of penetrating oil ... finally had to drill it out:)

I managed to remove most of it with a drill that was a bit smaller than the set screw so I can still see some of the threads. I hope to re-tap it to the original size but there's several things I need to know:
1) It looks like a 1/4" standard thread (as opposed to fine) but I'm not sure?
2) What was the set screws length?
3) Was the set screw or hole tapered?
4) The set screw was slotted on one end but what was the opposite end like?
and 5) Did the hole and threads go all the way through to the spindle or was there some sort of seat (seal) that the set screw interacted with?

Just drilling all the way through and installing a larger set screw would be a simple fix but I'm afraid it might leak on the belt if there was in fact some sort of seat or seal originally.
The lathe didn't run when I got it but the re-build is almost finished and I've tried to keep everything as original as possible even though 14 1/2" parts are pretty scarce. So if anyone can help me figure out how to re-claim the original hole and set screw, I'd be very grateful.
 
I got the refurbish book from eBay to refurbish my SB10L, didn’t have a problem with the screw but the book suggests using Superlube grease in the cone pulley so that’s what I’m using in there.
Ied probably use some Teflon tape on your screw after taping the hole.
 
dlane said:
I got the refurbish book from eBay to refurbish my SB10L, didn’t have a problem with the screw but the book suggests using Superlube grease in the cone pulley so that’s what I’m using in there.
Ied probably use some Teflon tape on your screw after taping the hole.
Click to expand...
I tried that too, I don't recommend it. My lathe siezed up in back gear. I would recommend oil, it flows better and in my opinion works better than Superlube, or any grease. I also found liquid teflon worked, well, but I didn't trust it for a long run. The oil has had long backgear runs.

3Dirk, I'll measure my 9A's a little later, I am almost certain it's the same size. I'll also take a pic as I remember it has a shape that you may wish to replicate.
 
The screw has a sharp point at the end. I think that point is the sealing surface (not the threads). Can't remember what it looked like from the inside when I did the rebuild, but the screw definitely has a point on it. I've been thinking of making a replacement because I messed up the slot a bit.

Rick
 
Surprman said:
The screw has a sharp point at the end. I think that point is the sealing surface (not the threads). Can't remember what it looked like from the inside when I did the rebuild, but the screw definitely has a point on it. I've been thinking of making a replacement because I messed up the slot a bit.

Rick
Click to expand...
(Mine is as 9C - don't know if it is the same for your size)
 
Thanks woodchucker ... that's exactly the info I was looking for and the pics are a real plus.
Next step will be to try to dig the rest of the set screw out and hope I haven't drilled out the seat in the step pulley that it seals against. Wonder if a set screw like this can be purchased somewhere?
 
Hmm...Now i know what the screw should look like. FWIW...I'm guessing my lathe's previous owner lost his so he just replaced it with a standard allen set screw. It works fine. Yea...little tricky getting it started but not that hard.
 
Ask me what happens when you have oil in the cone and you forget to put it back in. When I turned on the lathe .......
 
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