bq drill rod, threading (tapered, square thread)

[pmurdock]

I'm looking at making some tooling that will attach to drill rod. The threading is 3 threads per inch (square thread). What is the best way to do this? I've looked at the catalogs for vardex and kennametal and I don't see any inserts for square threads for use on our haas sl-30 cnc.

Since it's a square thread with a very large thread per inch, I wonder if I can't just use a boring bar with a helix cut pattern to create this thread.

I believe it's a tapered thread as well (at 2 deg)

any suggestions?

cheers,
Paul

[zdude]

If you you only have to make 1 piece, you may get by grinding your own cutting tool out of HSS.

[Red Frog]

Iscar makes threading tools for your application. In fact they have just engineered a rock solid laydown insert that doesn't move while threading. They are made for both I.D. and O.D. threading. I don't think you should try a simple threading cycle. Start with large cuts and decrease as you get to finish size. My finish passes are no more than .005 d.o.c.

[thesaurian]

I believe that you should be able to start your threading cycle at two separate points tho create a wider thread form. Imagine if the threading groove cut is .167 wide, then subtract the width of your tool from that dimension and use two separate threading cycles starting at a point ".167-x" away from the original start point along the same plane as your first cycle. It's been a while since I had to cut multiple start threads, but this should be no different than that, other than you are not starting at a point 1/2 th pitch or 1/3 the pitch away.

Let me know how you make out. Are you satisfied with your Haas?

[yasco]

Hi Paul:

The BQ rod thread is indeed tapered, but not exactly 2 degrees. The inserts are special, not just a square thread, and you must have them made to order.

Is the thread you need male or female? Do you need to make just one piece or how many? If you e-mail me a print, I might be able to help.

Best regards,

Yasco

yasco@comcast.net

[pmurdock]

Originally Posted by thesaurian I believe that you should be able to start your threading cycle at two separate points tho create a wider thread form. Imagine if the threading groove cut is .167 wide, then subtract the width of your tool from that dimension and use two separate threading cycles starting at a point ".167-x" away from the original start point along the same plane as your first cycle. It's been a while since I had to cut multiple start threads, but this should be no different than that, other than you are not starting at a point 1/2 th pitch or 1/3 the pitch away. Let me know how you make out. Are you satisfied with your Haas?

I was thinking along these lines.. thanks for the tips..

The Haas has been a great machine. Had to work out some kinks with the tool pre-setter but it holds it's tolerances quite well and is very easy to use.

cheers,
Paul

[pmurdock]

Originally Posted by Red Frog Iscar makes threading tools for your application. In fact they have just engineered a rock solid laydown insert that doesn't move while threading. They are made for both I.D. and O.D. threading. I don't think you should try a simple threading cycle. Start with large cuts and decrease as you get to finish size. My finish passes are no more than .005 d.o.c.

Do you by chance know where they show that on the web site. I looked through their catalog and didn't see anything. I image it's some type of buttress thread.

cheers,
Paul

[Red Frog]

I am truly sorry. I gave you the wrong information. The manufacturer is Sandvik. CoroThread 266 is the model.

[pmurdock]

Originally Posted by Red Frog I am truly sorry. I gave you the wrong information. The manufacturer is Sandvik. CoroThread 266 is the model.

CoroThread 266.. interesting I was looking at the spec sheets and didn't see any standard threads.. I did see however the "tailor made" variety where you can specify the threaded insert.. is that what you were referring to? Meaning I have to specify to them the insert dimensions?

cheers,
Paul