CaptainPugwash
Member
- Messages
- 95
- Location
- North West England
Anyone have any tips for sorting out my tight threads on my 1980s Boxford lathe's headstock spindle?
1 and 1/2" dia 8tpi
I have thoroughly cleaned the threads.
I put my new import 'boxford direct fitment' RDG supplied chuck on and it is very tight, especially when getting close to the register ring.
It is similarly tight with the old pratt burnerd chuck which was on the lathe as purchased.
I also have a faceplate off an Atlas lathe (1930s USA) which is also 1 1/2" dia 8tpi, and this is too tight to fit on beyond a few threads. But I have been advised the thread form may be different and be 60 degrees, with the boxford stuff being 55 degrees bs whitworth. It seems difficult to tell whether 55 or 60 with my old whitworth thread gauges, but certainly both 8tpi. For the record however, the new boxford backplates from RDG will go on an Atlas' spindle's external thread no issue. It isn't that big of an issue if they're not compatible the other way around because I can get a new far eastern boxford faceplate for £45 if necessary.
I would much rather thoroughly clean out the 4 backplates I have with a tap than touch the spindle thread on the boxford. Visually it looks good, and I am very nervous of damaging this component.
A tap seems super expensive to buy.
To get the chucks up the last thread / last 360° up against the register ring currently requires a good tug with an adjustable spanner on the chuck.
I'm basically asking if there's an easy solution/ something I haven't thought of here . Cheers
1 and 1/2" dia 8tpi
I have thoroughly cleaned the threads.
I put my new import 'boxford direct fitment' RDG supplied chuck on and it is very tight, especially when getting close to the register ring.
It is similarly tight with the old pratt burnerd chuck which was on the lathe as purchased.
I also have a faceplate off an Atlas lathe (1930s USA) which is also 1 1/2" dia 8tpi, and this is too tight to fit on beyond a few threads. But I have been advised the thread form may be different and be 60 degrees, with the boxford stuff being 55 degrees bs whitworth. It seems difficult to tell whether 55 or 60 with my old whitworth thread gauges, but certainly both 8tpi. For the record however, the new boxford backplates from RDG will go on an Atlas' spindle's external thread no issue. It isn't that big of an issue if they're not compatible the other way around because I can get a new far eastern boxford faceplate for £45 if necessary.
I would much rather thoroughly clean out the 4 backplates I have with a tap than touch the spindle thread on the boxford. Visually it looks good, and I am very nervous of damaging this component.
A tap seems super expensive to buy.
To get the chucks up the last thread / last 360° up against the register ring currently requires a good tug with an adjustable spanner on the chuck.
I'm basically asking if there's an easy solution/ something I haven't thought of here . Cheers