Miter Cuts?

[bakerkr]

Hi Everyone!

Wanted to know if anyone has any experince in cutting miter joints. Haven't done it yet, but seems I could use my 90 degree bits and make several passes to get a perfect 45 degree cut. Any jig ideals?

Thanks,
Kevin

[mikejohn]

I cut some mitres in 40mm (1-1/2") walnut recently and they were spot on
I did it in quite a number off passes though, it wasn't my walnut

I didn't need to jig it, just clamped away from the ends.
...............Mike

[jthelen]

Kevin,
I worked a cabinet shop where we did something called miter folding. This idea is you cut most but not all the way through. To assemble you applied glue in the miter, folded it together, and clamped it. You would need to experiment with amount of skin you left. We did this with a special 90 degree saw blade on a big Shoda router but the principal should apply. I have not have a chance to try it on my machine yet.

Jim

[Brady Watson]

Kevin...be sure to use a true 90° bit. MANY of them are between 87 - 93° for whatever reason. If you use a true 90, it will work very well.

-Brady

[bakerkr]

Brady,

Where did you get the true 90 degree bit?

Kevin

[Brady Watson]

I have found that the Freud brand of V-bits and the Gerber brand (from Gerber CNC) where right on the money...unlike my Bosch that comes in at 89° and Ryobi ones that are 91°...this sort of thing drves me nuts! I PAID for a 90°...ya know?

-Brady

[mikejohn]

I have a 19mm Trend which is spot on.
.............Mike

[slendon]

I believe that to make the folded mitre work you need to use a v bit with a small flat end, not a sharp point, this allows the material to stretch round the corner.

For full mitre cuts I use a large (32mm I think) Hersaf bit with replaceable cutters, indexable replacement blades are cheap and the accuracy spot on...it would be easy to grind flats on a blade and experiment.

Steve

[Brady Watson]

Yes Steve, you are correct...IF you are not cutting all the way thru the material.

-Brady

[jthelen]

Steve,
Her-Saf bits already leave a flat on the bottom as the point is offset about .014" for bit relief. See the note at the top of this page
http://www.hersaf.com/v_specs.html
Full line of V cutters.
http://www.hersaf.com/cutters04.html

Jim