Headstock tread adaptor

[Old Matey]

I’ve been trying to find a headstock thread adaptor with a 3/4 x 16TPI female thread to a 20mm x 1.5 TPI male thread. I’ve had no luck unfortunately. Does anyone out there know of any possible suppliers?

[Twisted Trees]

Metric threads are not measured in teeth per inch (1.5tpi) do you mean 20mm fine thread which has a 1.5mm pitch?  Describing it as M20x1.5 may help the search, however I suspect you may need to get one made.

[Old Matey]

Oops! It is 1.5mm pitch.
I have made an extensive search but have had no luck. As you say I might need to get one made.

[Bill21]

What lathe is it for? I ask as I saw a post on Facebook a while back by a guy who has made a few adapters for one of the budget lathes sold by the likes of MachineMart.

[Old Matey]

It is for a Record DML24x.

[Woodcrafts]

I would be more interested to know what you are trying to fit to your lathe that's got 20 x 1.5 thread. Sounds like it might be a chuck off a Tyme Avon lathe. If it is a chuck you may be better off spending your money on a newer chuck rather than the expense of an adaptor. Also I dislike adaptors as they move the work further away from the headstock and any runout becomes more evident.

[Bill21]

Also I dislike adaptors as they move the work further away from the headstock and any runout becomes more evident.

I agree, best avoided if at all possible. I wonder what chuck it is?