Drill a Square Hole?

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Blog entry by Grumpy posted 728 days ago 1735 reads 0 times favorited 7 comments Add to Favorites Watch

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.

-- Grumpy - "Always look on the bright side of life"- Monty Python

7 comments so far

View Prplhrtjarhead's profile


80 posts in 740 days

#1 posted 728 days ago

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.

-- "We'll preserve for our children this, the last best hope of man on earth, or we'll sentence them to take the last step into a thousand years of darkness." R. Reagan, "The Speech", 1964

View Jim Jakosh's profile

Jim Jakosh

11329 posts in 1739 days

#2 posted 728 days ago

I would think it would. The part would have to be very secure so as not to move from that off center cutting.
I’ll bet that is an expensive puppy!

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View JamesN's profile


26 posts in 804 days

#3 posted 727 days ago

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.

View harry1's profile


512 posts in 919 days

#4 posted 727 days ago

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.

-- Harry, Western Australia

View Dennisgrosen's profile


10850 posts in 1749 days

#5 posted 727 days ago

interesting …

but as I remebered 30 years back we used a bit with the same shape as
the fish bisquite you use to connect two pieces of wood

I can be wrong on this since it so long time ago but I thought back then
it maybee cuold be used on wood too


View J's profile


48 posts in 781 days

#6 posted 727 days ago

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.

View Grumpy's profile


19393 posts in 2485 days

#7 posted 726 days ago

I think those who mentioned the cost would be right. A very expensive looking item.

-- Grumpy - "Always look on the bright side of life"- Monty Python

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