|Project by Paul||posted 01-04-2014 02:49 PM||2788 views||24 times favorited||18 comments|
My parents were visiting over the Christmas break, and dad and I needed some shop time. So, we went to the shop and built a mini catapult from another one we had seen before. We actually made two of them for my boys, and they had a lot of fun launching back and forth at each other. Actually, they had more fun launching dog treats and watching them chase them all over.
The design is pretty simple, and only measures 10” long and 5 1/2” wide. All material was scrap pine.
It launches a clay ball (or a dog treat) about 25-30’.
I’ve added more pictures and measurements for the design. I didn’t have plans for one of these, but built it off of one I had seen before, so using the basic overall dimensions we were able to make a couple of them.
All material is 3/4” pine. The base is 10” long. The width is 5 1/2”. On the ends, you can see that I drilled slots in for the tension bars. the tension bars are just 3/4” by 1/8”. The dowel rod is 10” (1/4” diameter). The bucket at the end is 2 1/2” long and 1 1/4” wide. I just used a 3/4” forstner bit for the hole.
Everything was glued together with a brad nail at all joints. The diagonal supports were just cut at 45 degrees.
The middle rod is just a 1” dowel, with holes drilled in each end for 1/4” dowels (I did not drill all the way through, no need to). You’ll notice 2 – 1/8” dowels in the middle rod. That was done to hold the string.
The end piece (where the dowel swing arm hits) is 2 1/2 inches high with just a padded bumper on it (like you would use for a drawer).
The brace/release arm is 5” long and is 1/2” square, and is held on loosely with a bolt, as it needs to swing freely. It catches the teeth on the middle rod. Notice the teeth are cut at right angles, so it fits the release arm squarely. The tooth/catch wheel is 2 1/2” in diameter. There are 18 teeth. The teeth measure 1/2” x 1/4” each. This was just cut out on the band saw.
I hope that helps with the measurements.
-- Paul, Iowa