|Forum topic by Grantman||posted 07-25-2010 02:39 PM||1090 views||0 times favorited||5 replies|
07-25-2010 02:39 PM
I am building a sofa table, 6’ long x 12” wide. The base is 1/2” copper pipe and the top is 6/4 Canary Wood. Rather than one solid piece six feet long, I have two 3’ pieces “connected” by copper pipe. As you may be able to see on the attached drawing, when placing the two pieces on the top of the frame now, they’re too heavy for the top rail and it sags in the middle. I’ve exaggerated the drawing for effect. (bottom drawing)
If that doesn’t work, try this.
I am planning on inserting three pieces of copper tubing to match the three bottom rails between the two slabs of canary wood. The pipe has a nominal 5/8” O.D. but actually measures .635. On a test piece last evening, I was able to bang the pipe in but it’s too tight. I think I need a 21/32” or 41/64” bit.
My question is, how much space around the pipe should I allow for wood movement? The one advantage of using the 5/8” bit is that there’s no chance of the pipes bending and therefore no dip in the middle. If I get a larger opening, the wood may sag a bit.