Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Bloy on January 22, 2006, 02:26:55 PM

Title: Making a boring tool an internal threading tool
Post by: Bloy on January 22, 2006, 02:26:55 PM

..For general info....
Here are several pictures showing the grinding I did to convert a smallish boring tool.  The third picture is the resulting thread on an aluminum tube using Brian's simple threading wizard.

Title: Re: Making a boring tool an internal threading tool
Post by: ynneb on January 22, 2006, 06:44:55 PM

Nice post

Title: Re: Making a boring tool an internal threading tool
Post by: Brian Barker on January 22, 2006, 07:40:29 PM

You are having to much fun :) NICE work!

I was at a friend's house making threads in wood :) We did the square threads with the threadmilling in the NFS set..

Title: Re: Making a boring tool an internal threading tool
Post by: Bloy on January 23, 2006, 06:23:48 PM

Brian,
  Did you do the milling of wood threads in one pass?  Or did you set up a "cycle" to cut the square threads with
multiple passes?  Oak?  Maple?  soft woods?  This is interesting.  What was it that you were making?  Did you have a high speed spindle?   I'd like to see pictures of that setup.  Did you photograph the session? 
  I have a router table with some excess Z travel, rigid, and itching to fool around with mill threading(at least on short stubby pieces).  Eventually I'll be putting on the table a 5th axis(or simple sensored spindle) for slightly longer items....Yand A axes are slaved.  I can lower the table more, but it isn't yet set up to do so easily.

You piqued my curiosity!

John(bloy)

P.S.  just testing http://www.machsupport.com/Mach2/3/4 Forum

Title: Re: Making a boring tool an internal threading tool
Post by: Brian Barker on January 23, 2006, 08:47:14 PM

I will see if I can get him to cut one more thread so I can take a pic of it cutting:) It was not a high speed spindle, we cut the threads with a series one CNC in one pass. The wood was walnut and I think we were cutting it at 40IPM.

I will see him in a few days and I will see if I can get him to do it again!

Title: Re: Making a boring tool an internal threading tool
Post by: dfurlano on August 31, 2006, 09:42:30 AM

I am looking for thread milling tools.  I want to get the single tooth kind so I can do various threads.  I found one at Harvey Tool:

http://www.harveytool.com/products/product_detail.php?product_id=71000-C3&category_id=1&product_family=Thread+Milling+Cutters


I would really like an indexable cutter but I have not been able to find one.

Any insight would be helpful.

Title: Re: Making a boring tool an internal threading tool
Post by: John S on August 31, 2006, 05:27:03 PM

I do a lot of thread milling.
Anything that has short threads gets milled instead of screwcut.

Because I'm tight and begrudge spending mega$$ for a thread mill I use my own.

Small threadmills are just taps with all the flutes except one ground off.
Larger ones are just one insert out of a Coventry die head mounted in a holder.

(http://homepage.ntlworld.com/stevenson.engineers/lsteve/hidden/threadmill.jpg)

With an example piece that's been milled in one pass.

That same holder also serves as an internal threading tool on the lathe.

John S.