Gun Barrell Drill bits

[HossHoffer]

Hey, I work as an acft maint tech and just recently retired early from a major airline. One of the irreplaceable tools that I had was what we called gun barrel drill bits. I am down to the last few and can't find a source, even on-line. Does anyone knows where I can pick up a few of these beauties. They are made to cut only on the tip so as not to mess up any pre-existing holes. I'll bring some home from work and post a pic tomorrow.

Thanks, Hoss

[rodm1]

You will probable have better luck reposting at the like below. If you find a source with a web sight please post it here.


http://www.practicalmachinist.com/cg...ultimatebb.cgi

[A_Pmech]

Let's see a photo!

Gun drills and aircraft extension drills are common.

Never heard of a "gun barrel" drill, however.

[HossHoffer]

Whoops, forget to bring them home to photograph. I might look for gun drills though. Thanks for the link also. Will try and get those photos tomorrow.

[arkangel06]

We need pictures.....

[Elroy]

Deep hole drilling requires more than "special" bits. It also incorporates the proper guide and bushing system.


http://www.carrlane.com/Catalog/inde...3C3B2853514054

[foul_ball]

http://www.henchman.com.au/documents..._catalogue.pdf

^see page 14, or (6 of 9)

[ZRX61]

You mean the bits that are 12-18in long but the flutes are only 1/2in at the business end?

[Elroy]

Maybe this video will clarify deep hole "gun" drilling:

http://www.dmetool.com/video.htm

[foul_ball]

He's talking about margin-less drills with a very shallow cutting angle. The term "gunbarrel drill" is basically a nick name. These drills allow an airframe mechanic to back drill through existing fastener holes into a new part without enlarging the aforementioned holes. Personally, I can't find them anywhere except at work. I don't know if my employer makes them in-house or has contracted with a vendor.

[Packard V8]

Yet another reason to lament the demise of Boeing Surplus. We formerly were able to buy them buy the pound. On some military contracts, the tooling couldn't be transferred to any other use and much new stuff we taxpayers bought were sold as surplus.

thnx, jack vines

[foul_ball]

Originally Posted by Packard V8

Yet another reason to lament the demise of Boeing Surplus. We formerly were able to buy them buy the pound. On some military contracts, the tooling couldn't be transferred to any other use and much new stuff we taxpayers bought were sold as surplus.

thnx, jack vines

looks like there's a few useful things in the online surplus (I'm still sad about the physical surplus location closing though).

https://active.boeing.com/assocprodu...plus/Index.cfm