What would you think this thread is UNC or whitworth?

[Ulma Doctor]

looking at the less disturbed threads on the right side,
there appears to be a round bottom to the threads, screaming whitworth

 

[twhite]

3 to 1 for Whitworth. I will admit defeat. Mind you I don’t like it one bit. Just like having discussions with my wife. She is ALWAYS right. For I am an Idiot. Happy idiot mind you


Cutting oil is my blood.

 

[Beckerkumm]

To make it worse, I've found that most new replacement Whitworth come from India and often don't have the rounded feature- and can be undersized enough to fit UNC nuts. There may be better sources in the UK but what you can buy here in US is hit or miss. Dave

 

[twhite]

At this point why not just buy a length of grade 8 all-thread then you can tap the new handle 5/8-11 UNC. Then chase out the T-nut and add a bit of JB weld to make a solid fit. They do sell longer and shorter lengths.

Cutting oil is my blood.

 

[Beckerkumm]

Chasing out the nut goes the wrong way as the fit is all ready loose. If you are rehabbing a Whitworth machine, it is worthwhile to buy a set of taps and dies from India. I'm not a huge fan of stuff from India but the tap and die sets are pretty cheap and serve their purpose. If you have a thread cutting insert for your lathe, you can also buy 55 degree Whitworth inserts. BSF and BA threads are totally different so they can't be easily changed except for a few random sizes. I think BA have a 47.5 degree thread or close. They are often used for small screws on English machines. You might find those on your Colchester too. Dave

 

[benmychree]

I have both tap and die for 5/8 BSW, if you are interested, PM me.

 

[benmychree]

I also have a large number of other British taps and dies if anyone else may be interested, most are British manufacture.

 

[Beckerkumm]

I'd be particularly interested in BSF and BA. Dave

 

[benmychree]

I have a good bit of both, I'll get a picture and can e mail it to you; PM me with your e mail address.
John

 

[benmychree]

I'd be particularly interested in BSF and BA. Dave

I got them out of the drawer unit, there are 61 taps and 26 dies in BSF, and more tapa and dies in BA that I got tired of counting, hope to get pictures later today.