The SB parts list that Wells has on his site gives a part number as I recall N228 but does not provide tooth count or other specifications - I guess SB knows the detailed specifications.

I missed that there are different dps. Are there different internals to the work shop and light 10 gear boxes? The different pitches would mean that all of the gears inside the box are of that pitch?

Why are both a 20 and a 24 tooth gear listed? Does a different in the gear box end of the lead screw gear require a different spur gear on the gear box end?

I know that is not a stud gear. Those have 9/16 bore and , 18dp and 3/8 thickness. I think the thread origin (like the first or second reply) referred to the end of lead screw inside the QC box gear.

I hold to a kind of bayesian learning theory. I have my prior information and get some new information and then update the prior information to form a posterior distribution. So i had come to understa

I should have added that ebay listed part gives the bore 5/8 the thickness 5/8 and the diameter 1 5/8. In principle the dp can be calculated from this. As mentioned I got a strange result. I can't rec

I have the same issue. I just acquire a gear box that did not come with the gear. I tried a change gear and it clearly does not mesh. A calculation of dp from a listed gear was 14.7 - which seems impl

So the lead screw is different on the metric versions of the lathes. Are the internals of the qc box also different?

At the moment there seem to be more heavy 10 screws available.

I am almost certain that the rheostat was on a 220 single phase set up.

My father had a photograph dryer ( a big canvas belt on it) with a rheostat to vary the speed. I was under the impression that power (like horse power) was reduced as the speed was cut.

I grew up in a house with an old church organ my grand mother had obtained (she was then deceased but had been a music director). The organ had peddles to pump the wind as well as a pump in the back t

I am converting a c to an a. It has a 3 foot bed. I bought a lead screw on Ebay. I asked the seller if it was sloted. He said yes. Apparently he was referring to a keyway and not to the near end to en

I thought had a lead screw for conversion - alas bad communication. I see that the heavy lead screws are of the same diameter and same pitch as those for the workshop lathes. The rule of thumb is that

You say past 1938 is unlikely to be a fitting problem. Is early 1938 not in the low problem group/set?

I believe the same lathe is listed on Ebay.

So far I have not found an a or B crossfeed screw. I follow your clear discussion of replacing the threaded portion of a cross feed screw. Would cutting a C screw and splicing in the gear work in a si

With say a cylinder it easy for me to think of some simple measurement say with a dial gauge to determine accuracy. How is accuracy specified for a lead screw? I am not a machinist but a statistician/

Thanks for the information. I am trying to approach this with my own attempt of order. My first step is acquisition of the A and B apron. The cross feed screws seem to be a bottleneck as well. I have

Varying accuracy are claimed for different models of SB lathes lead screws. Also the different suppliers of acme stock makes assertions about high accuracy. What is involved and how is accuracy measur