Replies

1. 
   hammer1 | Oct 26, 2004 06:55am | #1

   Are the 1x3 flat or on edge? Flat won't help. A straight, flat frame made with lumber on edge will help. Larger frame lumber will add more strength, 1x3 is a little light for 8'. You could make the frame from 3/4" plywood rips may be 3"- 4" with some center members. Plywood will be less likely to warp than solid wood. Securely fasten the plywood to the frame. Finishing all sides once you have made a flat platform will also help to keep it from warping later.

   Beat it to fit / Paint it to match

1. 
   Saundo | Oct 26, 2004 07:11am | #2

   The 1x3 are flat, I will make a frame out of 2x6 pine. I appreciate your input very much. Thank you.  Saundo

1. 
   hammer1 | Oct 26, 2004 07:48am | #3

   You're welcome. 2x6, if you are talking about framing lumber from HD is overkill and is likely to warp. If you are comfortable with it, make sure you sight down the edges and pick the straightest you can find. You should put a few center pieces as well as end pieces, something like a ladder. Good luck.

   Beat it to fit / Paint it to match

2. 
   JohnWW | Oct 26, 2004 09:18pm | #4

   Your problem is in trying to use such heavy plywood for the track, when it warps it is too stiff to force flat with a frame.

   Use thin plywood (1/4 inch), Masonite, or MDF in any thickness for the track surface.  The Masonite and the MDF won't warp and thin plywood can easily be flattened by a lightweight frame even if it does develop a twist. 

   Any of these will need a frame out of at least 1x3 to stay flat, a heavier frame might be called for if the kids decide to use the track for a bridge or something equally inventive.

   John W.