Re: [CAD_CAM_EDM_DRO] Threadmilling success...

Kim,

Went one better for you, that thread you want is a UNEF 1" 9/16 - 18TPI
Listed at the lower of this page....

http://www.efunda.com/designstandards/screws/unified.cfm?start=302&finish=39
6

Have fun,

Jason Cox.

----- Original Message -----
From: Kim Lux <lux@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, October 25, 2003 6:37 AM
Subject: [CAD_CAM_EDM_DRO] Threadmilling success...


> I tested a Micro 100 TM250 single row thread mill today by milling a
> couple of 3/8-24 threads without much trouble.
>
> I drilled a couple 21/64" pilot hole using a G78 canned cycle. The
> holes were a bit oversized because I had the feedrate a bit high.
>
> I installed the TM250 in a collet and called the thread milling cycle I
> just wrote for TurboCNC. It machined a beautiful thread. My call was:
>
> G222 Z-1 D0.384 Q0.312 K0.41666 I0.010 F4 P1
> Where:
> Z = final depth of the thread
> D = final OD of the thread
> Q = starting diameter of the thread
> K = thread pitch (1/24 = 0.041666)
> I = feed increment for the radius path milling
> F = feed rate in IPM
> P = 2 finishing passes at the final diameter.
>
> I ran it at about 150% feed override, ie 6 IPM. It was kind of slow,
> but yet it was done quite quickly, being that I didn't have to manually
> cut the thread or load/set any special tooling. I didn't optimize the
> feedrate or depth of cut at all, I just ran it at that. Future threads
> might be cut quicker.
>
> I didn't know where to set the final OD. I measured a 3/8" tap and
> found the OD to be 0.379" A cut at that OD would start the bolt on the
> taper, but it wouldn't thread in. Adding 5 thou made a pretty good
> thread. A cut at 0.390 is a bit sloppy.
>
> I've got to cut a thread 1-9/16" x 18 TPI for a ballnut. Does anyone
> know how to calculate the starting hole diameter other than to subtract
> the pitch from the major diameter ? ie 1-9/16" - 1/18" = 1.5069" BTW:
> I've got a helical milling routine written too, so I'll cut the hole
> that way. Ie I don't have to buy a drill bit exactly the right size to
> cut the (oddball) hole size for the thread.
>
> --
> Kim Lux <lux@...>
>
>
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