As others have implied, thread mills are more cost competitive with
taps when doing large threads in large holes, but they also make it
easy to do things that are almost impossible to do with taps, such as
camera lens threads. These can be large diameter, very fine pitch, and
only a few threads deep, a sure recipe for cross threading or stripping
the threads with a tap.
Cheers,
Steve Stallings
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Mark Wendt
(Contractor)
Sent: Tuesday, May 20, 2008 8:55 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Thread Milling
Hi Steve,
My feeble mind has finally gotten around how the things work.
Makes sense now. I was thinking of it from a "tap-centric" view... ;-)
Mark
At 08:37 AM 5/20/2008, you wrote:
The direction of rotation of the thread mill does not reverse, only
the helix that it travels reverses. Think of it as switching from
conventional milling cuts to climb milling cuts.
Steve Stallings
-----Original Message-----
From: [EMAIL PROTECTED] [
mailto:[EMAIL PROTECTED] Behalf Of Mark Wendt
(Contractor)
Sent: Tuesday, May 20, 2008 6:52 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Thread Milling
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
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