I'm trying to align a wood block across a 10 inch table saw blade for a cove cut

Rhino Rhino for Mac
1

Hi all,
I am going to be pushing a piece of wood across a 10 inch table saw blade at an angle to create a cove profile. I have the profile ( a simple radius) drawn out in Rhino, and am trying to figure out how to align the “blade” ( a 10 inch diameter, 1/8 thick solid cylinder) to best match the profile. Is there is a way to align a circle of a specific diameter to an existing surface curve?
Thanks for any help
Stefan

2

What is the stock size and what elliptical cove size are you trying to achieve?

3

Hi John,
The stock blank is 2" high and 2.5" wide. 3/4" from the outside face, and 1/2" up from the base is a 3/4" radius. The final shape is an “L” with a a radiused inside corner. I’m a bit flexible with the end shape, something fair and close will do.
Thanks for any ideas you have.
S

4

Can you upload a sketch of what the coved stock should look like after it’s cut please?
I think that would help with understanding what you need.

5

hey john, see this:

i’m on a phone so can’t give any rhino examples but the idea is to run the board across the table saw blade at an angle and basically carve out a cove

6

I understand the process @jeff_hammond, I’ve done it myself. I wanted to fully understand what @Stefan1 wants to get.

1 Like
7

This will in most cases not be a perfect match to an ellipse, but at least you will get the depth and width using the following method:

  1. Draw a circle (the diam of the cutting blade) with its quadrant in the “bottom center” of the cove (red).
  2. Draw a straight line at the height of the surface of the work piece (red).
  3. Starting from from an intersection point between the circle and the line, draw an arc or circle (red)
  4. The intersection between the last circle and the edges of the coves will give you the angle (green line and circle in the picture.)
  5. ( edit ): Add the thickness of the blade inwards of the cove edge, along the circle path.

Cut Cove.jpg1398×702 502 KB

Hope this helps.

// Rolf

1 Like
8

Sorry for the late response, at the shop all day. Rolf’s description is perfect for what I needed! Thanks John and Jeff for your help as well.
S