Tight thread

Need some advice please I recently purchased a Myford chuck adaptor to mount a chuck onto a rotary table, the chuck in question screws onto my S7 without any problem however when I screw the adaptor into the chuck it goes tight so whats the best way to ease the thread on the adaptor ? Any advice welcomed .

Hello Harry,

One approach is to set up for thread cutting and take just a skim off the flank of the thread on the adaptor with it mounted into the lathe MT socket. A second approach is to run a 12 tpi die along it if you have one, or even a 12 tpi tap [bottoming] held in a tool holder in the tool p[ost to use as a thread chaser. Don't overdo it, you are after all trying to take off only a few thou without altering the thread form.

Regards Brian.

Harry,

At the risk of "playing the same old record"

Before you start easing threads ... Are you absolutely certain that it's not the plain register that's wrong ??

There are previous discussions on this forum.

MichaelG.

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Edit:  Read through some of these.

Edited By Michael Gilligan on 10/01/2014 10:02:36

may be worth checking the spigot as well.

regards

Geoff

Thanks for all suggestions and comments it looks as if it's getting tight just before the register but over the weekend I intent a much closer look at the problem,

Again thanks H

Harry,

Haven't noticed anyone stating the obvious - because it is obvious - but can be overlooked. Make sure that both threads are absolutely clean and lightly oiled before fitting together.

Guy's found the problem after making sure the threads were clean and taking up Robbo's suggestion of a little light oil I was able to screw the chuck on further but still very tight when it start over the register and it was at this point that I thought try one of the other chucks I have (Doh why didn't I think of it before) this one screwed on as it should so I need to do a little scrapping and it should be OK.

Cheers H