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On Tue, May 20, 2008 at 3:42 PM, Mark Wendt (Contractor) <
[EMAIL PROTECTED]> wrote:
> At 08:32 AM 5/20/2008, you wrote:
>
>
> 2008/5/20 Mark Wendt (Contractor) <[EMAIL PROTECTED] >:
> At 07:04 AM 5/20/2008, you wrote:
>
> 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
>
>
> Okay, I think I got it now. Thanks for helping me understand how the
> things work Sven! My mind just wanted to latch on to threading with a tap,
> and I didn't quite get the geometries of how the thread mill was actually
> working.
>
> Mark
>
>
> The magic thing is that fast CNC operations with thread mills doesn't go 15
> turns if the thread itself is 15 turns long. The mill is thrown down in the
> hole, goes maybe 3 turns and then out. In its simplicity it's amazing to see
> in full speed.
>
> Regards,
> sven
>
>
> I gotta go see one of these things in action... ;-)
>
> Mark
>
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