Lost dial lock screw - 10K large dials

[DavidR8]

In cleaning up the shop yesterday I noticed that the locking screw for the compound dial was missing. It must have been loose and vibrated out. I swept and ran a magnet through the sweepings but no luck.
My Starrett thread gauge goes to 28 TPI and the locking screw for the other dial is finer than 28 so maybe it's 32TPI.
I guess I can make a new one but wonder if anyone has a spare.
Thanks in advance

 

[C-Bag]

Man that sux. Double wammy that it seems fine thread. I replaced one of them on my RF30 but it wasn't an odd thread. Did it in brass and I think it looks classy, but it's certainly not something I'm trying to keep stock. Hope somebody can help you out.

 

[DavidR8]

Thanks mate, I was/am kinda bummed about it.

 

[John O]

Is the size a #8 or #10 screw?

 

[DavidR8]

I just measured the OD of the remaining screw and it's .178 or 11/64".
That doesn't seem to correspond to a #6 or #8 so that's perplexing.

 

[Janderso]

I just measured the OD of the remaining screw and it's .178 or 11/64".
That doesn't seem to correspond to a #6 or #8 so that's perplexing.

David, are these original South Bend or did someone retro fit?
If it's SB, you know it has to be an Imperial thread. If retro?? who the heck knows.
That is the szhitzz

 

[John O]

thread chart from 1916 shows #9 screw with 24,30 and 32 tpi

 

[DavidR8]

Jeff they are definitely original. Definitely the szhitzz

#9... I did not know such a thing existed John. Thanks!

 

[Janderso]

thread chart from 1916 shows #9 screw with 24,30 and 32 tpi

Me either. #9 is a new one to me.
What year is your lathe David? I had the small dials. They were terrible.

 

[DavidR8]

Me either. #9 is a new one to me.
What year is your lathe David? I had the small dials. They were terrible.

It's a 1975. I can't imagine having small dials, I have a hard enough time reading the large ones