Order of operation for shaft repair.

[John TV]

So I need to repair a short shaft for a boat lift winch. The threads were stripped on the threaded portion that the "hand wheel" is connected to and that brings up my first question. Is there a name for a threaded shaft that has two flats 180 degrees apart to act a bit like a key in that it prohibits Turing on the shaft? Second question is it better to mill the flats first then use a die to cut the threads? Or do you cut threads then mill the flats. I assume both would work but is one method preferred?


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[mmcmdl]

Easier to thread then mill the flats IMO .

 

[markba633csi]

Threads first, then flats

 

[RobertB]

It would be very difficult to get a die to cut on a flatted shaft. It's even difficult to clean up existing threads on one. The die will want to cam off of the edges of the flats.

 

[RJSakowski]

While you could cut the threads on a lathe with the flats previously cut, you will have a better quality thread with the non-interupted cut.

 

[John TV]

Thanks for the advice. Love this forum.

Is there a name for that type of shaft or "bolt" with two flat sides?


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[JimDawson]

Is there a name for that type of shaft or "bolt" with two flat sides?

I think that is the best name No standard name that I know of.

 

[aliva]

Die, flats, die again.

 

[John TV]

Lol that could be a movie title.


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[RobertB]

Is there a name for that type of shaft or "bolt" with two flat sides?

I can hear the giggling already, but a shaft with 2 flats is actually called a "double d" shaft