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Very cool annunaki. It looks like it follows an eccentric orbit to make a near perfect square. Never thought of how one would do that with a spinning bit in that fashion!I think in straight lines, but dream in curves
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I thought you just used a square bit to drill square holes. Problem is - I can't find any square bits.
RichardComment
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Wonder what it would do in a piece of wood......Don, aka Pappy,
Wise men talk because they have something to say,
Fools because they have to say something.
PlatoComment
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Wouldn't it work the same? Or are you thinking the wood might split or something?
I still don't understand the theory behind how it achieves this - does the bit have a retrievable edge (no, I think), or is it just the eccentric motion? More likely the latter, but I'm unable to get my brain around how exactly precise that motion has to be.It is the mark of an educated mind to be able to entertain a thought without accepting it.
- AristotleComment
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Heck, I was thinking of just using a mortiser the last time I needed a square hole. However, I didn't have one, so I did something else. (was making a ladder for a fire truck coat rack for my son a few years ago - I just used a dowel instead)"It's a dog eat dog world out there, and I'm wearing Milk-Bone underwear."- Norm (from Cheers)
Eat beef-because the west wasn't won on salad.Comment
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Great for metal, sufficiently overcomplicated for wood.
In my opinion the Mortiser is the single most underappreciated piece of equipment in any shop that does M&T joinery.
Yes a Domino can do great/quick M&T; but once the setup is done on a mortiser; you can blast through all the mortises on a project in a few minutes.Comment
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Square holes
I seen Roy Underhill cutting square, or pre designed holes for use on a wood square. He had a belt, with the template on His belt, and a strange two piece steel drill bit. Cutting holes in wood!I have Hope, and I am Thankfull! Consider WhoWhoGreated it ALLComment
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It's just a triangle shaped bit mounted off axis.. amazingly simple solution.
This video helps understand how it works
http://www.youtube.com/watch?v=L5AzbDJ7KYILast edited by sscherin; 10-20-2011, 06:26 PM.William's Law--
There is no mechanical problem so difficult that it
cannot be solved by brute strength and ignorance.Comment
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Well, the video puts to life what I said with words. The video is more eloquent
I think in straight lines, but dream in curvesComment
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This is usually done with Reuleaux triangles, which are basically a simple curve of constant width. Something can roll on top of them very smoothly, but they don't make good wheels because the centers don't stay centered. They rotate nicely inside of a square, which is why they can be used to drill square holes.
They're very easy to make, and if you have kids, I'd recommend making some. It's a blast to see the looks on their faces when something rolls so smoothly on top of triangles!
I made some for my kids to play with a couple months ago, and now the contraption is being shared among classes at my boy's school. There's a video here on my web site that shows how easy they are to make:
http://www.thefrankes.com/wp/?p=2518
(And yes, I cheated a bit with the video!)
Last edited by Alex Franke; 10-24-2011, 11:26 PM.online at http://www.theFrankes.com
while ( !( succeed = try() ) ) ;
"Life is short, Art long, Occasion sudden and dangerous, Experience deceitful, and Judgment difficult." -HippocratesComment
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Very cool video, Alex. I assume the Reuleaux triangle is based on an equilateral triangle after watching your son draw one. Never heard of them before but they are cool.This is usually done with Reuleaux triangles, which are basically a simple curve of constant width. Something can roll on top of them very smoothly, but they don't make good wheels because the centers don't stay centered. They rotate nicely inside of a square, which is why they can be used to drill square holes.
They're very easy to make, and if you have kids, I'd recommend making some. It's a blast to see the looks on their faces when something rolls so smoothly on top of triangles!
I made some for my kids to play with a couple months ago, and now the contraption is being shared among classes at my boy's school. There's a video here on my web site that shows how easy they are to make:
http://www.thefrankes.com/wp/?p=2518
(And yes, I cheated a bit with the video!)
After reading your link, I agree that the OP's video must be a Harry Watt bit that drills a hole that is "nearly square."Last edited by phrog; 10-25-2011, 04:04 PM.RichardComment
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Looks like a Wankel engine with sharp edges.Bob
Bad decisions make good stories.Comment
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How to Drill Square Holes
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