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3K views 7 replies 7 participants last post by  Grumpy 
#1 ·
Drill a Square Hole?

We have all seen a mortising machine poke a square hole out of wood but have a look at this for a metal cutter. I wonder if it could be used on wood?. Just a thought.

http://static.photobucket.com/player.swf
 
#2 ·
Looks to me as though it would work on wood, but you need the whole machine, not just the bit. I'm sure you saw this, but the chuck was spinning on two different axis.

Great idea though. I'm sure some American company must have done the same, dang chinese don't give a hoot about a patent.
 
#4 ·
I've actually seen a couple of things made to make square holes in wood. They "Wobbled" as they worked. I say wobbled because it is the easiest way I can think of to describe the rotation. The wobble created the effect of making a square from a round bit. I wish I could remember what the name was, I was looking for a shop made mortising machine when I came across it.
 
#5 ·
Each time I watch that clip Tony I wish that the slowmo would concentrate on the trajectory of the chuck not just the bit. Let's face it, even if such a bit could be used in a standard drill press (which I'm certain it can't) the cost compared to the conventional mortice bit would preclude it's use by hobbyists.
 
#7 ·
There is no reason why one couldn't drill holes in wood like this, but I bet the fact that there is a supplementary good (the mortising machine/bit) makes this method of drilling a square hole foolishly cost prohibitive.
Larger scale bits that use the same planetary gearing system and Reuleaux triangle shaped bits have been used in mining for years and the rotary engine (Mazda's RX motor) also uses the same planetary movement designed by Felix Wankel.

I found a patent on Google.
http://www.google.com/patents/US4074778
 
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