- 1-1/4" Forstner Bit
- Drill press
- Speed square
- 1-1/4-in. trim-head screws
- 1x2 board
- 1x4 board
- 3/8-in dowel
- rubber bands
Project step-by-step (6)
Crosscut the Lumber to Length
Begin this desktop catapult project by first clamping down your board and use your jigsaw to crosscut the 1x4 board to 8 in. for the base (Part A), the 1x2 board to 12 in. for the arm (Part B) and the 1x2 to (2) 6 in. lengths for the vertical struts (Part C). Mark the lengths with a pencil and use a speed square with the jigsaw to make a straight cut.
Cut Notches with Jigsaw
Place the 6 in. boards on the corners of the face of the 8 in. board and scribe the lines that need to be cut with a jigsaw. Clamp the 8 in. board to the work surface and cut out the notches with a jigsaw.
Drill the Holes for the Dowels
Temporarily fasten the struts together with painter’s tape face to face. Mark 3/4 in. and 4 in. on one of the struts and drill 7/16 in. holes on those marks with a drill press. Mark 3 in. from one end of the arm (Part B) and 3/4 in. from the other end. Drill straight through the board with a 7/16 in. bit and drill press.
Use a Forstner Bit to Create the Desktop Catapult Bucket
Mark a spot 1-1/4 in. from the end of the arm (Part B) and 3/4 in. from the edge. Drill about halfway through the board with a 1-1/4 in. diameter Forstner bit.
Fasten the Struts to the Base
Drill a pilot hole in the struts (Part C) and fasten them to the base with two 2 in. trim head screws.
Finish the Assembly with the Dowels
Cut the dowel to three 4-1/2 in. lengths and slide them into the holes, creating the final form of the catapult. Put the rubber bands on the catapult to finish the project.