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Forum topic by markv posted 742 days ago 805 views 0 times favorited 10 replies Add to Favorites Watch
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5 posts in 744 days

742 days ago

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 1148 days

#1 posted 742 days ago

11/8 divided by 4=11/32
so 11/32 in between each outer edge of the cove

that how far to center lines

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

-- . @NANeanderthal on twitter

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5 posts in 744 days

#2 posted 742 days ago

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

View jmos's profile


681 posts in 968 days

#3 posted 742 days ago

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

View dusty2's profile


312 posts in 2027 days

#4 posted 742 days ago

jmos: A neat trick so frequently ignored.

-- Making Sawdust Safely

View EPJartisan's profile


1045 posts in 1723 days

#5 posted 742 days ago

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."

View PurpLev's profile


8476 posts in 2247 days

#6 posted 742 days ago

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.

View chrisstef's profile (online now)


10398 posts in 1604 days

#7 posted 742 days ago

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


4747 posts in 1175 days

#8 posted 742 days ago

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


4522 posts in 1673 days

#9 posted 742 days ago

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


397 posts in 747 days

#10 posted 742 days ago

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

-- Ride hard or go home~

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