1" x 8 - BSF or UNC?

[rileytoolworks]

As the title.
Is a 1" x 8 headstock thread a BSF or UNC thread?


Thanks in advance for the help.

Adam.

 

[woodfarmer]

Look at the threads. If the tops and bottoms are radiused (rounded off) they are BSW if they are straight 60 degree point or flat topped they might be UNC.

 

[rileytoolworks]

Sorry. I should have said I don't have a thread (or a lathe for that matter) with this thread. I need to make a spindle to hold a 'standard' woodturning chuck, and need to know what threadform such chucks use. Only info I can find is the thread size and pitch. Oh, and I don't have a chuck yet either. .
Thanks for the help.

Adam.

 

[Walter Hall]

Based on the data provided by Nova for their chucks it would appear that the standard for 1" x 8tpi spindles is UNC.
(Assumption based on the fact that they don't supply a BSF version)

http://www.teknatool.com/support/how to id your lathe thread.htm

 

[woodfarmer]

Also to add a little, ( I answered a bit late yesterday)
If it were BSF there would be 10 threads per inch
Both BSW and UNC would use 8 threads per inch
ALL for 1 inch diametre.

 

[tekno.mage]

My old Jet lathe with a 1" x 8tpi spindle uses a UNC thread. I believe UNC to be the most common thread type for 1" x 8tpi wood lathe spindles as any 1" x 8tpi chuck I've tried on it (and I've tried quite a few different ones!) fit just fine

 

[chipmunk]

+1 for UNC i.e. 60 degree threadform rather than Whitworth 55 degree.

I use a 1" UNC Tap to cut threads for wooden faceplates and it works just fine for my Jet headstock.

HTH
Jon

 

[rileytoolworks]

Thanks for the help folks.
I'll be working on making a small lathe sometime next year, and will post my progress here.
All the best.
Adam.