Re: [CAD_CAM_EDM_DRO] Threadmilling success...

Kim,

Take a look at www.efunda.com, you will find all the info on those odd ball
threads there by doing a search. I think the ballscrews usually UN.

Regards,

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@...>
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
> Post Messages: CAD_CAM_EDM_DRO@yahoogroups.com
>
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...,
timg@...
> Moderator: pentam@... indigo_red@... [Moderators]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
> NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
> bill
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>