Re: [CAD_CAM_EDM_DRO] fine-pitch threadcutting on thinwall tubing

Hi, it takes a lot of patience and practice. thread galling is a real
problem no matter what the material. I worked on a project for a screw
machine shop, it took about a year before the tap design, machine tight
enough, and feed steady enough. Must be watched constantly as the slightest
build up of chips will ruin the part. holding the part is also a challange.
a new cnc machine can do multipass single point quite well. sometimes the
part must be held by its od for support while threading. just not a nice job
to try doing without time and waste. Some of the parts we tried but were not
sucessful were wall thickness down to .005 in alum. .007 chrome brass(tobin)
was quite easy with a real solid machine. cul Brian f.

----- Original Message -----
From: "Multi-Volti Devices (Murray)" <multi-volti@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, March 14, 2002 12:56 AM
Subject: [CAD_CAM_EDM_DRO] fine-pitch threadcutting on thinwall tubing


> Anyone here have the ability to thread thinwall metal tubing with fine
pitch
> threads (like camera filters). Inside as well as outside?
>
> I at first imagined one needed really weird taps & dies, but it occurred
to
> me that maybe it's just done with a cuttign tool on a lathe.
>
> Then the question is...how does one obtain the right diameter tubing? I
> imagine there are a limited number of sizes, and metric is another
problem.
>
> Oh, by the way, the application is threaded tubes & spacers for optical
> applications.
>
> I found a machininst who does this stuff but it's frightening costly...so
I
> wondered if it is frighteningly difficult.
>
> Thanks
>
> Murray
>
>
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