When building a slingshot utilizing scales, it's necessary to have to wood be as flat as possible. The reason is that it helps in preventing delamination. When I was staring out in making slingshots, I didn't have the necessary tools to ensure flatness (a jointer or planer), so I often just tried to purchase stock that was as flat as possible. However, you can use your router to ensure flat stock, and that's what we will be doing today.
What you will need:
- Jig made out of scrap wood / mdf
- Hot glue gun
First thing we are going to do is hot glue each end of our stock:
We now clamp the jig to the table, and ensure it's secure!
I'm using a flush trim bit with a bottom bearing, but you can use any straight bit:
Start with the thinnest stock you have, and make a very small pass.
WARNING: DO NOT HIT THE CLAMP
After several passes you'll have a nice flat top:
Using your chisel, carefully pry the scale off of the jig.
You'll notice the jig was not greatly affected by the hot glue. Just be careful with the chisel not to damage the jig in the process.
Now repeat the steps with the rest of the stock finishing only one side first! Then pass the stock through on the alternate side.
Now you will have flat stock for your next slingshot project!!