Deep Trepanning a part

gdgambler · Apr 29, 2011

I have been approached to make a part that has a .165 shank or core and they want a trepan machined .5 deep into the existing .25 stock. This is 6061-t6 aluminum. Is this doable. Seems almost impossible or better yet not practical. Can anyone help with some info as I don't know much about trepanning.

Robert Campbell Jr. · Apr 29, 2011

...uh.... 1/2" deep into 1/4" stock? Making a leap here, no notation so I'm guessing inches?

For some of us, well.... maybe just me.... l need further info.

Is the ".165 shank or core" the diameter of the trepanned hole? That's less than 3/16", a drill won't work?

"Seems almost impossible", yup, hear ya' there...

Bob :confused:

MachinistChest · Apr 29, 2011

Perhaps you can make the part from two pieces, c`bore the hole and press the shank in.

...MC

Goff · Apr 29, 2011

How about a custom annular cutter, like a Hougen rotobroach.

gdgambler · Apr 29, 2011

The trepan has to leave .165 and cut out to .245 so its taking .040. Thats working in diameter mode.

Limy Sami · Apr 29, 2011

In .250" dia stock as in leaving a 0.0025" wall?

Without special (and expensive) tooling, at over 2 dia's deep with such a small cutter you're in enough trouble already?

vraptor · Apr 30, 2011

That's do-able, but you're going to have to grind some special tools with itty-bitty cutting faces and lots of relief on the other side. You didn't say, but does the trench have to be a square cross section?

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Deep Trepanning a part

gdgambler

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Robert Campbell Jr.

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MachinistChest

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Goff

Aluminum

gdgambler

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Limy Sami

Diamond

vraptor

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