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Square corners

This is a discussion on Square corners within the Portable Routing forums, part of the Routers category; A thought has just popped into my head, how do professional door makers make the ...


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Old 04-30-2010, 11:16 PM   #1 (permalink)
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A thought has just popped into my head, how do professional door makers make the patterns with square corners. I know that they use CNC machines, but that in itself doesn't answer the question. I wonder if multiple cutters are used, finishing the internal corners with a "V" cutter.

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Old 05-01-2010, 12:57 AM   #2 (permalink)
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Originally Posted by harrysin View Post
A thought has just popped into my head, how do professional door makers make the patterns with square corners. I know that they use CNC machines, but that in itself doesn't answer the question. I wonder if multiple cutters are used, finishing the internal corners with a "V" cutter.
Hi Harry - with a CNC I think they overshoot a bit, lift out of the work and replunge in going the next direction.
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Old 05-01-2010, 01:58 AM   #3 (permalink)
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Wouldn't that still leave round corners John?
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Old 05-01-2010, 07:21 AM   #4 (permalink)
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What kind of doors are you talking about Harry?
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Old 05-01-2010, 08:29 AM   #5 (permalink)
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Hi Harry,

It would probably follow along the same principles as the following links.

YouTube - Drilling a square hole! (www.howround.com)
YouTube - square hole drilling
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Old 05-01-2010, 08:54 AM   #6 (permalink)
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What kind of doors are you talking about Harry?
Excuse the lousy photo., but if you look at it carefully, you'll notice that the outside corners are perfectly square.
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Old 05-01-2010, 08:58 AM   #7 (permalink)
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Hi Harry,

It would probably follow along the same principles as the following links.

YouTube - Drilling a square hole! (www.howround.com)
YouTube - square hole drilling
I can't see that Ken, in spite of it being very interesting, there really are some clever people out there. I hope all is well in the Hamlin household.
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Old 05-01-2010, 09:28 AM   #8 (permalink)
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Hi Harry

The only way I see how they do it , is with the stamp mold type,(just like a big waffle iron press ) that's to say when they make the stock (MDF) they stamp them out with a 200 ton press.

When they make the stock (MDF) it looks like dry oat meal..

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Excuse the lousy photo., but if you look at it carefully, you'll notice that the outside corners are perfectly square.
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Old 05-01-2010, 09:55 AM   #9 (permalink)
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Probably not practical for "inexpensive" CNC machines but if you add another axis to allow the cutting bit to be tilted, you can mill a square corner with a V-cutter. The bit is tipped such that one side is parallel to the cut direction and the tip is in the corner. Now you can cut square. And technically, it still isn't square, the tip of a V-cutter is till a bit rounded but close enough for government work.

An alternative to tilting the bit is to tilt the work piece but ultimately this all means more steps, more complexity and more cost so I doubt it how its done in production cabinetry.


p.s. - my post is referring to INSIDE corners. If you mean an outside corner, you will get a square corner as the bit transitions from an "X" travel to a "Y" travel because all the cutting happens just at the little tangential point. However due to some slop in the equipment it can and probably will round over a little bit.

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Old 05-01-2010, 10:44 AM   #10 (permalink)
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Take a look at these vids. It becomes clear soon enough. Yes, things are quite well here, especially that it's stopped raining... for now.

YouTube - Square-Hole Drill in Three Dimensions
YouTube - Drilling a Hexagonal Hole
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