# i forgot the formula...

• posted on March 5, 2007, 11:18 pm
hi,
if i use a 2 3/8 hole saw to drill a hole in a door what will the diameter of the circle be? (guess i should go back to high school, eh)?
thanks,
sammy

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• posted on March 5, 2007, 11:25 pm
um, uh, am I missing something here?

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• posted on March 5, 2007, 11:32 pm
The formula is E = MC^2.
But a 2 3/8" hole saw will usually make a 2 3/8" diameter hole. The radius will be 1 3/16 and the circumference will be 1 3/16 x 3.1415

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• posted on March 6, 2007, 1:47 am

pi * d = circumference, no? (2 3/8 * 3.1415) ?
Patriarch

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• posted on March 6, 2007, 1:20 pm

Actually, the diameter, what he asked for, is the width of the hole, 2 3/8". I guess he assumes that the diameter of the hole that he drills with a 2 3/8" hole saw will be different because of the kerf.

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• posted on March 6, 2007, 4:51 pm
wrote in

The OP asked a different question than Oughtsix tried to answer. And Oughtsix has been out of geometry class for a while, so I tried to correct that.
Do I still not win? ;)
BTW, Leon, nice square jig in ABPW today.
Patriarch

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• posted on March 6, 2007, 9:37 pm

2 points for Jonny on the spot. ;~)

Thanks, the original posted jig inspired me to design one that would not need any measurements to interfere with an accurate build.

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• posted on March 6, 2007, 11:03 pm
Yep, my highschool geometry is turning over in her grave.

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• posted on March 6, 2007, 11:38 pm

Your high school English teacher probably isn't doing much better. ;-)
Puckdropper
--
Wise is the man who attempts to answer his question before asking it.

To email me directly, send a message to puckdropper (at) fastmail.fm

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• posted on March 5, 2007, 11:32 pm

How thick is the hole saw blade? Tom

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• posted on March 5, 2007, 11:33 pm

Or rather, kerf. Tom

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• posted on March 5, 2007, 11:34 pm

That would be piD or 3.14x diameter
Pete

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• posted on March 5, 2007, 11:36 pm
whoops. meant circumference. but i figured it out. sorry for the confusion.
thanks,
sammy

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• posted on March 5, 2007, 11:44 pm

It will be 2 3/8" and the wrong size for your door knob. Your standard door knob will need a 2 1/8" hole.
Mike O.

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• posted on March 6, 2007, 1:22 pm
wrote:

Did he mention a door knob? ;~)

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• posted on March 7, 2007, 2:52 am
On Tue, 06 Mar 2007 13:22:06 GMT, "Leon"

I guess I've worked too many doors!
Mike O.

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• posted on March 6, 2007, 4:16 am

That would be d x 1 In this case, 2.375 x 1.0000000 = 2.375
Don't stop at high school, keep going back.

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• posted on March 7, 2007, 3:24 am
sammy wrote: | hi, | | if i use a 2 3/8 hole saw to drill a hole in a door what will the | diameter of the circle be? (guess i should go back to high school, | eh)?
D = D
:-D
-- Morris Dovey DeSoto Solar DeSoto, Iowa USA http://www.iedu.com/DeSoto/solar.html