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Routing an exact centre

by KnickKnack
posted 09-30-2016 11:38 AM


4 replies so far

View Cooler's profile

Cooler

299 posts in 837 days


#1 posted 09-30-2016 12:39 PM

I take two passes with my dado blade to get a slot centered. I got that from Norm Abrams on his show.

I set up my mortising chisel by taking a cut from the right, then the left until the two only make one cut.

It is worthwhile repeating.

Also, when I am making dados for a 12” shelf, to ensure that the lefts and rights are exactly the same I start with a 25” wide piece and cut the dados across the sheet and then rip it to two 12” sides.

-- This post is a hand-crafted natural product. Slight variations in spelling and grammar should not be viewed as flaws or defects, but rather as an integral characteristic of the creative process.

View KnickKnack's profile

KnickKnack

1088 posts in 3560 days


#2 posted 09-30-2016 12:42 PM

I take two passes with my dado blade to get a slot centered. I got that from Norm Abrams on his show.
- Cooler

And flip the board in between?
That will be centred, yes, but of an indeterminate width – if you need the slot to be the exact width of the dado blade?

I set up my mortising chisel by taking a cut from the right, then the left until the two only make one cut.
- Cooler

Unless I’ve misunderstood this, you’ve done this on a scrap piece of wood before doing it on the “real” piece? That isn’t the situation I described in which you have only a single piece, the “real” piece, available.

-- "Do not speak – unless it improves on silence." --- "Following the rules and protecting the regulations is binding oneself without rope."

View Cooler's profile

Cooler

299 posts in 837 days


#3 posted 09-30-2016 01:05 PM



I take two passes with my dado blade to get a slot centered. I got that from Norm Abrams on his show.
- Cooler

And flip the board in between?
That will be centred, yes, but of an indeterminate width – if you need the slot to be the exact width of the dado blade?

I set up my mortising chisel by taking a cut from the right, then the left until the two only make one cut.
- Cooler

Unless I ve misunderstood this, you ve done this on a scrap piece of wood before doing it on the “real” piece? That isn t the situation I described in which you have only a single piece, the “real” piece, available.

- KnickKnack

You are correct on both points. But for multiple grooves or dados setting up the dado head to the right width will be much quicker. For a single groove or dado your method can make sense.

I’ve seen jigs that make exact sized gooves or dados in two passes.

-- This post is a hand-crafted natural product. Slight variations in spelling and grammar should not be viewed as flaws or defects, but rather as an integral characteristic of the creative process.

View Joe Lyddon's profile

Joe Lyddon

10091 posts in 4046 days


#4 posted 09-30-2016 04:23 PM

For such a small dado, I would NOT use a dado blade, unless it was just ONE 1/8” blade.

I would find the middle by measuring, the old fashioned way…
... adjust fence to get wood Center in the center of the blade.
... THEN, make a Left cut, flip around, & Right cut…
... The cut WILL be in the Center of the wood… no question about it…
... Then, adjust the fence, ever so slightly, make L & R cuts again, to get the final Dado width to fit your needs.

-- Have Fun! Joe Lyddon - Alta Loma, CA USA - Home: http://www.WoodworkStuff.net ... My Small Gallery: http://www.ncwoodworker.net/pp/showgallery.php?ppuser=1389&cat=500"

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