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Old 11-19-2011, 01:11 PM   #41
Richard D
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Default Re: The Square Drill Bit

Slater wants way too much for their rotay broach, as do the few other companies that make them. Plans are out there to make your own, I plan to do so someday.
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Old 11-19-2011, 01:24 PM   #42
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Default Re: The Square Drill Bit

Depends on the circumstances, but basically any high-end cutting tools for CNC machines are not going to be cheap. For us, it was cheaper than a broaching machine, and less headaches than subcontracting the work.

There's really not a lot to the mechanics, just good bearings that can stand up to the thrust force while still spinning freely.
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Old 11-19-2011, 03:07 PM   #43
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Default Re: The Square Drill Bit

I don't expect "cheap" but why are the holders $800? I just don't see it.
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Old 11-29-2011, 07:49 PM   #44
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Default Re: The Square Drill Bit

that is awesome!
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Old 02-15-2012, 01:02 PM   #45
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Default Re: The Square Drill Bit

I've used a 5-side version of this (for hexagons) on lathes in the Navy. We had the fixtures for this variation on lathes and rotary broach fixtures for drill presses. I think the ones that we used may have had a collar for the piece to guide the shape of the polygon though...
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Old 02-15-2012, 01:39 PM   #46
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Default Re: The Square Drill Bit

The Little Machine Shop used to carry a holder for about forty bucks. I called them a few months ago. It is on back order indefinitely.
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Old 02-15-2012, 02:10 PM   #47
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Default Re: The Square Drill Bit

Yep. Remember these Reuleaux triangle bit techniques from machine shop class over 30 years back. Square and hexagonal holes. Thanks for posting the video so others can see it.
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Old 03-22-2014, 11:38 PM   #48
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Default Re: The Square Drill Bit

Actually this technology is from the good old USA. I have a catalog that is almost 100 years old offering the drill bits and floating head to produce square holes.

I had seen this video on another site and laughed when I read that this "great innovation" was developed in Asia.

Happy Wrenching!
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Old 03-23-2014, 04:31 PM   #49
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Default Re: The Square Drill Bit

Quote:
Originally Posted by GRX View Post
Yep. Remember these Reuleaux triangle bit techniques from machine shop class over 30 years back. Square and hexagonal holes. Thanks for posting the video so others can see it.

looks like a smarter application of the Reuleaux triangle, see this animation on the wikipedia page on said triangle:







added to some kind of wobbly cutting profile to get sharper corners.
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