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Forum topic by markv posted 07-13-2012 08:49 AM 821 views 0 times favorited 10 replies Add to Favorites Watch
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markv

5 posts in 801 days


07-13-2012 08:49 AM

Hi, I am a newbie and realize I should have paid attention in algebra. Here is what I am trying to figure out. I am making a case with a 2.5”W stile. I am trying to route 3 evenly spaced flutes with a 3/8 cove bit but none of my formulas seem to work out. I am sure one of you guys can help.


10 replies so far

View Newage Neanderthal's profile

Newage Neanderthal

190 posts in 1205 days


#1 posted 07-13-2012 09:54 AM

3*3/8=9/8
20/8-9/8=11/8
11/8 divided by 4=11/32
so 11/32 in between each outer edge of the cove

2.5/3=.83333333333333333333333
that how far to center lines

This is why dividers were invited, space it off and call it done

-- www.newageneanderthal.blogspot.com . @NANeanderthal on twitter

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markv

5 posts in 801 days


#2 posted 07-13-2012 10:11 AM

Thanks for the quick reply, that is exactly what I needed.

View jmos's profile

jmos

681 posts in 1024 days


#3 posted 07-13-2012 10:48 AM

A quick way to do this without the math is to take a rule and lay it on the stile so that 0 is on one edge and 4” is on the other. It will have to be slanted to do this. Now, each 1” mark is equally spaced across the board; make ticks at 1”, 2”, and 3”, and you have three equally spaced center lines.

Quick and accurate.

-- John

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dusty2

315 posts in 2084 days


#4 posted 07-13-2012 11:45 AM

jmos: A neat trick so frequently ignored.

-- Making Sawdust Safely

View EPJartisan's profile

EPJartisan

1056 posts in 1780 days


#5 posted 07-13-2012 03:11 PM

One used frequently by anyone making dovetails by hand though.. LOL. great reminder tip, jmos. I have often realized math is handy, but there is always a more hand-on method available.

-- " 'Truth' is like a beautiful flower, unique to each plant and to the season it blossoms ... 'Fact' is the root and leaf, allowing the plant grow and bloom again."

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PurpLev

8476 posts in 2303 days


#6 posted 07-13-2012 03:15 PM

also a good reminder why gauges are so much easier to use than rulers and measurements in woodworking.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

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chrisstef

10841 posts in 1661 days


#7 posted 07-13-2012 03:16 PM

There’s an App fpr that …. ive got it on my iphone as “Tapeulator”. Comes in pretty handy i tell ya, but the ruler trick is much easier for laying things out considering you dont have to measure in 32nds.

-- "there aren’t many hand tools as awe-inspiring as the #8 jointer. I mean, it just reeks of cast iron heft and hubris" - Smitty

View waho6o9's profile

waho6o9

4921 posts in 1231 days


#8 posted 07-13-2012 03:22 PM

Thanks for the math and the ruler trick. I appreciate the different ways of
accomplishing the same thing, and it’s good to know.

View richgreer's profile

richgreer

4524 posts in 1729 days


#9 posted 07-13-2012 03:23 PM

Despite having an advanced math degree, when I needed to cut three evenly spaced flutes I didn’t use any math at all.

I cut the center one first. After a little experimentation I was able to find dead center and that is where I cut the first flute.

I then strived to put the second flute half way between the center and the edge. Cut the second flute, turn the board around and cut the third flute. Even if you miss the spot that is dead center between the middle and the edge, you will still get 3 evenly spaced flutes.

Don’t hurt your brain trying to figure the math out.

-- Rich, Cedar Rapids, IA - I'm a woodworker. I don't create beauty, I reveal it.

View dust4tears's profile

dust4tears

397 posts in 803 days


#10 posted 07-13-2012 06:10 PM

Great question~
I learned something new today…..I can go back to bed. Day accomplished~

-- Ride hard or go home~

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