Square Hole Drill

Just when you thought you had all the tools - you come across something you don't have.

A square hole drill - quite amazing.......

http://s1086.photobucket.com/albums/...eDrill-bit.mp4

I don't know if I can find any links but at my last company in the UK, I had a tool that could bore internal and external :- square, hex and "D" profiles ( or any shape needed) just by changing an internal cam. (I have a need for one of these tools to bore some hydraulic pump profiles for deep sea stuff! ) It was made by a english company called "microbore" - but I believe that they are not around anymore!
Thanks for the link - maybe they can make something that will work for me???
( If anyone thought Aerospace machining was hard - try "Deep Sea Oil Field" - same "exact tolerances" BUT with more difficult to machine metals!!!)

Hi,

yes quite amazing square hole, but who need a square hole? there are not square screws! or?

Enzo :confused:

Don't think it would work in a hand drill. As for square bolts, a carage bolt has a square part at the head end to hold the bolt in place in place while tightening.

Corky

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Originally Posted by tipo158

As for square bolts, a carage bolt has a square part at the head end to hold the bolt in place in place while tightening.

Corky

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They work great for holding the bonnet and boot on (hood and trunk to you across the pond)

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Originally Posted by tipo158

a carage bolt has a square part at the head end

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Please tell us you don't know that from working in the Aeroplane industry......!!

I've got a box of drills like that .... drill all sorts of shaped holes ... :confused:

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Originally Posted by john

Please tell us you don't know that from working in the Aeroplane industry......!!

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So, would it make a difference as to which airplane you fly in the future??? Beside being a retired engineer from Boeing, I play around with carpentry, in fact I built the work shop where I am putting my kit together. To set you mind at ease, we didn't use carage bolt on the modern airplanes.

I don't think I've ever flown in any other passenger plane than a Boeing, so I'm mighty relieved to hear that!
Maybe you have to go back to the Wright's to find a carage bolt?
I've seen carage bolts on a Stratos replica, but I won't say where.....

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Originally Posted by StruanR

I've got a box of drills like that .... drill all sorts of shaped holes ... :confused:

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Ditto.... mine are "screwfix" specials

Quote:

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Originally Posted by StruanR

I've got a box of drills like that .... drill all sorts of shaped holes ... :confused:

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Bet you didn't need any special cams to make that happen either :D

No don't need any special cams, blunt broken drills do any shape you want, although not necessarily in any predictable fashion...:rolleyes: