creating an accurate trough

[brian]

I've been asked to make a 1.5 dia trough for a flute.It starts out with two 1 inch peaces of wood that will both have a 1.5 wide by .75 deep trough.When glued together it makes a 1.5" radius bore
He wants it fairly accurate.
I've used the shape editor to try to get what I want so far I've been able to get the 1.5" wide I need but the accurate depth is the issue.So far either it's been to shallow or way to deep

Brian

[Brady Watson]

Just draw a 1.5" circle, using node editing mode (N key) and remove the 2 upper arcs. You'll have a perfect shape.

-B

[garyb]

As Brady said node edit your 1.5" circle for a profile, then do a two rail sweep
Gary

[harold_weber]

If you are going to make more than a few of these parts, I'd buy the Whiteside #1415 corebox bit (which is a 3/4 radius) and create a toolpath that simply has a few depth passes and one light final cleanup pass. The cutting will go much faster (there will be no stepover, just stepdown). Hope that's clear - coffee's not ready yet.

[Gary Campbell]

Brian...
Agree with Brady & Gary on the 2 rail sweep. Cut 2 pieces of material together as per Gary's picture, then assemble.

Cant see how Harold's method will work. Using a 3/4 radius tool can possibly reduce stepover of 1 1/2" radius cut path, but not eliminate multiple paths to get final cut.

[harold_weber]

OH,,,,,,,,,,,,,,,,, now that I've had some coffee, I see he wants a 1.5 inch radius circle, I thought I read 1.5 inch diameter. Sorry.

[Gary Campbell]

I KNEW it was a coffee problem!

[MogulTx]

I have heard of this "Two rail sweep" a couple of times on this forum. I need to look through the help files and see what I can learn about that. I think it will be the next big tool in my skills kit ... it sounds like it will add some great capabilities.

[gc3]

http://www.vectric.com/forum/viewtopic.php?f=28&t=4749

here is a good and quick tut on a sweep

[brian]

Thanks for the quick responses.
I didn't think the two rail sweep would work for this.


Thanks again