Chinese innovation - square holes from a standard mill

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Chinese innovation - square holes from a standard mill

Postby Doug Coulter » Wed Nov 09, 2011 8:40 am

We don't hear much about the Chinese actually innovating and inventing. But this is pretty cool. It was sent along by a friend who liked to amaze my engineers by whipping out a wood mortise bit to show them a square hole in wood -- this is something well beyond that.
http://youtu.be/agiHZOsMR34
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Re: Chinese innovation - square holes from a standard mill

Postby Starfire » Wed Nov 09, 2011 2:04 pm

They also make round pegs :lol:
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Re: Chinese innovation - square holes from a standard mill

Postby chrismb » Wed Nov 09, 2011 2:42 pm

Doug Coulter wrote:We don't hear much about the Chinese actually innovating and inventing. But this is pretty cool.



..but unfortunately this is not a Chinese invention!...

What we hear most of are Chinese copies, of which this is one.

I read of this in one of Martin Gardner's maths books when I was a little lad, when he was talking about curves of constant width, of which this is an example.

The earliest I know it to have been invented is the 1970's, but whether it has an earlier origin than that even, I don't know.
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Re: Chinese innovation - square holes from a standard mill

Postby Doug Coulter » Wed Nov 09, 2011 2:58 pm

Probably yeah, the math's been around -- the Wankel is what it reminded me of. But you couldn't actually buy a milling tool that made square holes yet so the idea was sterile in western hands.

Would you like it if people said - assuming your fusion device works, that it was anticipated by Einstein, and all you did was copy his ideas?
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Re: Chinese innovation - square holes from a standard mill

Postby chrismb » Wed Nov 09, 2011 3:04 pm

I'm pretty sure I've seen them for sale before.
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Re: Chinese innovation - square holes from a standard mill

Postby Doug Coulter » Wed Nov 09, 2011 3:09 pm

Not here in the most insanely large and diverse machine tool sellers like McMaster-Carr. Maybe Jerry has seen one?
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Re: Chinese innovation - square holes from a standard mill

Postby Laurence Upjohn » Wed Dec 14, 2011 6:06 pm

Hi all;
The script on this video is Japanese so maybe this is Japanese tooling rather than Chinese after all. LRU.
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Re: Chinese innovation - square holes from a standard mill

Postby Jerry » Wed Dec 14, 2011 8:19 pm

The chuck is called a Watts Chuck, made by the Watts Brothers Tool Works in Wilmerding PA. It can also do hexagonal and octagonal holes.
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Re: Chinese innovation - square holes from a standard mill

Postby Jerry » Thu Dec 15, 2011 2:50 am

Some more info: The original patent was applied for back in November 1916 and the patent, #1241176, was granted September 25, 1917 to Harry J. Watts of Turtle Creek, Pennsylvania.

The one in the video is a refinement of the nearly century old tech by Dijet in Osaka, Japan
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Re: Chinese innovation - square holes from a standard mill

Postby Doug Coulter » Thu Dec 15, 2011 9:20 am

So, where could I buy one? You seem to be concentrating on the chuck, and yes, I noticed a wobble, but it seems the bit also is special? Would it break the bank?
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