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It just occurred to me that a fairly obvious and available ready-made choice would be an adaptor from the thread on the left end of the spindle to 1-1/2”-8 would allow one to use a Jacobs 59B

Thank you everyone for the great information. Mike what a great find.that hardened shaft looks amazing. So I do have timken bearing in this lathe so when I restored this lathe a year ago I changed

Actually, it is not necessary that the bar be perfectly straight, just as it is not necessary that it be held perfectly aligned in the chuck or spindle taper. What you are trying to do is confirm that

I built a spider for my Atlas Clausing 12X36 to chamber rifle barrels for various rebarreling projects. The spider is a light press fit on the end of the spindle with two rows of 4 socket head cap

I just ordered 1 of these , seemed worth it as we have several lathes in our group that it will fit . $50.00 with shipping from england , well see how long it takes to get here

those are some pretty nice lookin welds on the new nuts ??? ??? animal

Well, on a Timken bearing lathe, it is fairly hard for this to get OUT of alignment. The headstock is an interference fit into the inner faces of the bed ways, and unless chips or whatever was left

I replaced my half nuts a short while back with a brass pair cast and machined by a friend. Oddly the original 1968 pair were almost completely unworn! Not only did I remove the apron while replacing

What I did was very practical. I needed to bore a 2" hole 4" deep, straight and true to a tolerance of .0002". I began boring way early and simply experimented at shimming the legs until I had a

In my opinion, the vertical surface of the bed least likely to have any significant wear since new is the rear of the front way. To check alignment against that surface you will need (1) a dial

Good opportunity to clean up the innards as I see you've done! Looks nice.?Dave? Sent from my T-Mobile 4G LTE Device

One way to do it, costs some money, would be to make or preferably purchase a ground Morse taper 3 alignment bar with about 12” of straight length. I have such a bar that I purchased from an eBay

Most methods start with a parallel test bar - a bar that fits the spindle taper with a longish section ground round and true to the taper. Pop it in the spindle and measure the TIR in a few places,

Today I installed a pair of new brass half nuts on my 12” Atlas model 3996 underdrive cabinet lathe. Bought the half nuts from an eBay seller. No problems with the install. Photos of the inside face

That could only work in a perfect world,? kind of like a perfect 3 jaw chuck that compensates for everything.?Dave? Sent from my T-Mobile 4G LTE Device

If you go that way, soft point set screws don't work. Need to have a little slug to bear against the threads of the part you're trying to lock or at least restrain.?Material choice depends on

I would like an iris instead of the set screws. Ralph

No worries Dave, I've been getting them. I think I do like the idea of the set sews on the spider bolts any sort of jam nut.-Jody

hi guys have looked around at the files and can’t find out how to check alignment of the spindle to the bed. Aka to made sure the spindle is paralleling the bed ways. Thanks for the help this group

Sorry for the multiple replies! Got some slow....... internet today! Dave