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Thread: Drilling square holes
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20th May 2012, 02:37 PM #1
Drilling square holes
Thought this might interest some:
[ame=http://www.youtube.com/watch?v=ALiqAXiTQBg]Square Hole Drill-bit - YouTube[/ame]
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20th May 2012 02:37 PM # ADSGoogle Adsense Advertisement
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20th May 2012, 02:50 PM #2Senior Member
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interesting...not sure id like to be standing too close with the sound it was making but
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20th May 2012, 04:21 PM #3Senior Member
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Used a boring head during my apprenticeship in 1986 that bored square holes.
Was adjustable for size.
Never had a reason to use one since.
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20th May 2012, 09:26 PM #4
Hi,
Thanks for posting that, i've seen the same principal work in theory but never in practice. Your right though Bunny Lover, the noise is terrible, and it appears to be only in Al.
Ewan
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20th May 2012, 09:31 PM #5
Where do you buy the square bolts and nuts to fit them??
I'll have to have a look at bunnies next time for square bolts?
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20th May 2012, 09:33 PM #6
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20th May 2012, 09:42 PM #7SENIOR MEMBER
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20th May 2012, 10:51 PM #8
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21st May 2012, 12:44 AM #9Dave J Guest
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21st May 2012, 12:50 PM #10Senior Member
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Watts Bros. (still surviving) developed the square hole drill about 1917. There is a bit of information on why they work here:
Drilling a Square Hole
In the Dec/Jan 1992 issue of MEW there was an article describing the principle, and a description of making one, by one of their contributors. Would be an interesting exercise, but I'm not going to do it!
Frank.
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21st May 2012, 05:23 PM #11
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22nd May 2012, 01:12 AM #12GOLD MEMBER
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Its also why you cant check if something is round by measuring it with a micrometer or the like.
Stuart
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