Geometry/ Engineers/ CAD peeps - Can you helpa D.A. out?

I am building a poker table. I have run into a hurdle that I am getting stumped on.

I have an oval (the play surface) that is 91.25" long by 43 5/8" wide.

I created this oval by taking a standard 4x8 sheet of ply and cutting the corners off to make it an oval. Measure 24" in from the side and end, then used a 5/16" router bit to make the cut with a circle jig set 24" in length gives me the rounded arc.

For my play surface, I used the same 24" point from above and moved my router circle jig to a 22" length to create the play surface.

Now I need to build an arm rest that needs to over hang the play surface by 1" with a total width of 5.5". The arm rest will be pieced together as the total dimensions will be larger than a 4x8 sheet of plywood.

My question is: what length measurement do I set my circle jig at in order to create the correct arc?

Does that make sense???

 

Set your guide at 23 for the inner arc and 28.5” for the outer.

 

How? 28.5" would be off the end of the plywood.

I am envisioning cutting the end arcs and then joining them to the straight side pieces.

 

If I am understanding you correctly, you just need to screw another piece of wood onto whatever you are cutting.
This temporary piece will be used for the arc center.

 

Sounds like you have a 24 inch radius, just on the two ends? I'm envisioning a straight section on the long sides?


For the outside radius, extend your router out the 1". For the inside radius, move your router back 4 13/16", from your original position.

 

@eggfooyoung

To create the original oval out of the 4x8 sheet, Yes, I used a 24" radius.

To create the play surface, I used a 22" radius from my original 24" pivot point and 2" down the side to connect the outside of the arc.

The sides are still straight.

 

This is why everyone should have a buddy with a CNC Router...

 

Figured it out last night while laying in bed.

My play surface radius was 22". For whatever I want the over hang to be, 1" in my case, I subtract that from the play surface radius. The outside radius I get by adding the width of the piece I want to cut out. So in my case, 5.5" + 21 gives me an outside radius of 26.5"

A friend with a CNC that cuts plywood would be amazing for these two cuts. Alas, I don't have anyone like that.

 

I'm in Nashville if it's anywhere close to you. I've even got a 5' X 12' machine that we would cut you a big one on.

 

gambling is illegal.

 

Dang! That'd be awesome but I'm in Columbia, SC.

Thank you tremendously for the offer.

 

Is this what you are trying to do?

 

The ends were cut with a 24" r, not Ø. No flats on the short sides.

 

Am I seeing this right?

 

@Chris

You've got it.

The 24" radius cut was to get the 4x8 sheets in a oval.

The 22" radius cut is my "play surface"

I need to make an arm rest to over hang the play surface by 1". Total width of arm rest is 5.5"

 

I think your numbers might be off just a bit in regards to the arm rest. If you want the width of the arm rest to be 5.5", it would overhang the playing surface by 3.5". If you want it to overhang the playing surface by 1", the arm rest would need to be 3" wide.

Which is correct?

 

5-1/2" arm rest:





3" arm rest:

 

Or perhaps this is what you are talking about:



The dimension lines are pretty cramped, but I believe you can see what I'm talking about.