Half-round concave cut on a curved 2x8 semicircle

Hi Robert

"A simple diagram here would work wonders" = yes it would.
Also a picture(s) is worth a 1000 words...
Just make the diagram then save it and then upload it to the forum same thing for a snapshot or two
Just select edit on your post,then hit the item called Manage Attachments, then select the files you saved or snapshots and the up loader will do the rest.

Download Paint.net it's free and will let you draw a simple diagram.

http://www.majorgeeks.com/download.php?det=4548

Paint.NET is image and photo manipulation software designed to be used on computers that run Windows XP or 2000. Paint.NET is jointly developed at Washington State University with additional help from Microsoft, and is meant to be a free replacement for the MS Paint software that comes with all Windows operating systems.

The programming language used to create Paint.NET is C#, with GDI+ extensions.

Paint.NET has many of the powerful features that expensive commercial applications have, including the ability to use layers.

This is the second semester that Paint.NET has been a project at Washington State University, and we have the goal of adding as much functionality as expensive commercial applications provide, but of course, for free!

Bj

Robert

I notice that you haven't yet been able to post a picture of your dilema and that you haven't got an answer to your problem.

I think I understand your problem and suggest that you need to think outside the box, or board, in this case.

Instead of trying to accomplish the answer with one piece of wood gusset, the problem can quite easily be solved using two pieces as follows.

Firstly, cut 2 blanks of 2 X 8 nominal to the identical size, then temporary attach the two pieces together using long wood screws in areas that you will not be cutting into. Put a mark on the inside of the piece to indicate the two inside faces before attaching them together.

Next, cut the arc profile on your band saw on the 4 X 8 nominal blank. Now remove the temporary screws from the gusset. Both pieces will now be matched with the same cutting irregularities and identical profile and are now ready for routing.

Chuck up a 3/4" cove bit with bearing in your table top router and route along your arc on the inside face of the half gusset. Route the two pieces in a least 3 passes to the overall height of 3/4 +/- " height .

When routing is completed for both pieces, simply screw or bolt the two halves together and you should have the concaved arch profile that you are looking for.

The resulting gusset will be 3 +/-" thick and have a 3/4 "side leg, that will provide lateral support to the gusset.

I am assuming you will be using U bolts or pipe hangers to attach the gussets to your metal framework.

I hope this simple solution is helpful and won't require you to pull out any more hair or lose any more sleep over your dilema and allow you to get on with your project.

Route away.

Ric

Robert

I have some concerns as to what you may be attempting to do !!!!

raising the bit and using a collet let the template follow the collet on the underside of the stock

Click to expand...

I hope you mean "bearing or guide bushing" and not the " collet " as there is a good chance, that if you make contact to the collet, while the motor is powered up, it may loosen your router bit and cause either extensive damage to you, your router or both.

I am not sure you can raise the cove bit high enough to route properly while setting your router bit to the proper depth inside the collet as the shanks are fairly short to begin with, assuming you are using a 3/4 cove bit with top bearing?? Do not attempt to shorten the amount of shaft that goes into the collet as again dire consequences may result.

Hope I'm not too overly cautious here, but I would feel remorse if something were to happen that I could have prevented.

Please clear up any confusion and let us know how you make out with your project.

Ric