Re: [CAD_CAM_EDM_DRO] Re: Thread milling!!

Jon Anderson wrote:

> Jon,
>
> Who was your source for that cutter, and what pitch range does it have?
> The one MSC sells for a 5/8 thread is .500 in dia.
> One of the attractive things about a lathe threading bar is that inserts
> are available in a range of pitches. But it would only take 3-4 of the
> single row type to cover most threads anyway.
> For the job at hand, if it went into production as designed, I'd surely
> buy the full thread type and spin the thread in one pass. With a
> potential for hundreds of holes threaded, the time savings would cover
> buying a dedicated pitch cutter.
> If the job doesn't go through, I'll just start laying in a collection of
> the single row type.

I'll have to look up where I got the single row thread mill. I suspect MSC,
but it could be some other source. As for pitch range, I think it will take
anything on the fine-pitch end, and probably down to 20 or so on the coarse.
The only parameters of interest are the side relief (it looked pretty steep) and
the difference between tip radius and the bottom of the 60 degree cutting
tooth. This tool STILL cuts the full thread in one pass. You just run it at
a little slower feed, since all the cutting is being done at one point.

I cut my threads backwards (ie. from the bottom upwards to the top) so
I can climb mill the cutting action.

Jon