by Halfj-7 » Mon Aug 26, 2019 12:54 pm
My track ended up being a tri-oval due to the way I banked the corners. I really like it, over say a paperclip, since the front and back stretches have to be driven slightly different. I can go deep into corner 1, but have to let up a little early into 3. My track is 16' long, and around 7 wide, 4 lanes at 4.25" spacing.
When I made a corner, I laid out all 4 lanes plus inside and outside edges on a full sheet of 1/2" MDF. I didn't go a full 180 degrees (turn 1 and 2), instead I stopped at 170 degrees. Then routed just the inside lane. I did the same thing for 3 and 4, just mirror imaged 1 and 2.
Then I cut it out the inside and outside edges. Laid it on the table and used a ratchet strap at widest point to pull it into a bank, trying to get to 180 degrees. Didnt quite make it, but I lined up the back stretch at right angles to corners and screwed it all down with shims under the banking. The front stretch was rough in with and I used a home made plastic/flexible fence to do the inside lane. Search engine "Luf's router fence" for an idea.
Once the inside lane was done, I made a router guide out of plexi-glass and a couple pins and routed out the other lanes like you would on any other track. Routing on top the banking was a worry at first, but ended up just fine.