2008/5/20 Mark Wendt (Contractor) <[EMAIL PROTECTED]>:
> At 06:37 AM 5/20/2008, you wrote:
>
> Trying to wrap my mind around this tool. One of the bullet points says
> that only one tool needed for right or left hand threads. Howdeydodat?
>
> Mark
>
> The rotation direction of the threading pattern. Same tool goes either left
> or right turns.
>
> Sven
>
>
> Looking at a picture of the tool on the web site, it basically looks
> similar to a highly modified tap, fitted to a high helix end mill. I
> realize that's a bit of a generalization for a thread mill, but I must be a
> bit dense, because I still don't see how you could cut both right hand and
> left hand threads using this mill. Do they put right hand threads on one
> flute and left hand threads on the other flute? I can understand how they
> do it on a lathe type tool, where the cutting bit has just the teeth cut
> into the tool with the pitch of the threads, but the milling cutter looks
> like it has developed thread patterns that extend around the mill for the
> width of the flute. Wouldn't reversing the direction of the spin just back
> out the tool from the hole?
>
> Mark
>
>
There are no threads on a thread mill, all the cutting edges are in pairs
and on the same distance from each other as the supposed thread climb.
Assume you take a couple of dinner plates and stack them, that's the same
profile.
The same tool can be used for M10x1,5 and M16x1,5, The tool itself has a
smaller diameter than the hole it is going to thread, and the machine is
then moving the mill in a circular pattern (as when pocketing a hole) with
the same vertical "climbing speed" as the thread. If the thread is a 1,5
mm-threader the machine must move the mill 1,5 mm each turn it makes in the
hole. The speed or RPM of the mill actually doesn't make any difference, as
long as it's relative to the working piece.
Here's an explanation: http://www.sct-usa.com/millhelp.asp
Regards,
Sven
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