5/8-56 tap

[old mart]

That groove is the clue, as mikey notes. You can experiment with some springy wire making a 5 or 6 cornered ring that presses on the base of the groove...

[old mart]

Lets have some pics of your lathe, Doc, I for one love to learn new things, and had never heard of gang lathes, all the lathes at my old firm were either...

[old mart]

Over the pond in the Model Engineer forum, a member has asked about the 5/8-56 tap he has. It has a plain front end which is intended to function as a...

[old mart]

There are many grades available, some workharden if your tooling dwells for an instant, some likes to attack you with murderous razor wire and some cuts...

[old mart]

I think that the person who fitted that knob simply used what they had to hand despite it not being ideal.

[old mart]

I would think that the design of a gang tooling lathe severly restricts the size of the components that it can turn. Great for thousands of small parts,...

[old mart]

Great to hear a positive result, all the cleaning was worth it.

[old mart]

Its always the scroll and the teeth on the jaws that get 99% of the muck, but it is difficult to clean those parts without dismantling the chuck. I have...

[old mart]

I have been waiting a month to get a box of 2.5mm inside er16 Trapezoidal inserts from China. Got them today, Descar brand made by Lifeng, in China. I...

[old mart]

I wonder if the colours are from local induction hardening?

[old mart]

Another thing that could be a clue is the shrink packing, if they were from one of the big boys, they would be in a box, that makes me think they could...

[old mart]

I think it is just grease, we will know soon when the scroll is cleaned....

[old mart]

When the parts have been cleaned, inspect the flanks of the teeth and scroll with a magnifying glass.
I know that Bison kit is well made, I picked...

[old mart]

I see, so right and lefthanded boring bars would be suitable candidates for tools.

[old mart]

Why counterfeit? The cheap ones are Chinese which have risen in quality by leaps and bounds in quality in recent years.

[old mart]

I would look at ways of parting the knob and collar while still allowing a friction joint. Otherwise, check out the design of the cross slide knob and...

[old mart]

Have fun getting every spec of muck off the chuck parts. That is a very good advert for Bison it is beautifully made, impressive. No screws holding the...

[old mart]

Thats what I feared, there are several very similar things made by the big boys who like to keep their tooling proprietry. The grade number is the best...

[old mart]

The pictures of the dial and knob look to me suspiciously like they are one piece of metal. I am going on the matching nickel plating. Mr Fixit could...

[old mart]

One way to stop the swarf from getting into the gap might be to sit an o ring in there. As long as it can squash slightly as the parts go together and...