Laser Cut 3mm MDF Compression Testing Jig
thingiverse
This is a low-force compression testing jig made from 3mm thick MDF on a 24"x18" laser cutter. It works with a set of weights to create a moment about a pivot point. The test specimen resists the moment. It is suitable for teaching about Moments (Torque) and Column Buckling (for loads up to about 75N) I have posted a Youtube video describing it's use to https://youtu.be/D3uR74XVNJs It would probably handle greater loads with a 6mm thick load arm... feel free to modify the included Fusion 360 design. I've left it all at 3mm for ease of manufacture. I have included "full sheet" drawings suitable for producing class sets as well as the original, individual part profiles. Each jig requires: Bottom Gussets (5) Bottom One Side (1) Bottom Other Side (1) Loading Surface (1) Tower Outline (2) Tower Gusset (1) Top Tower Brace (1) Arm (1) Bottom Tower Brace (1) 2 x 1/4" (or 6mm) nuts with bolts. 3/4" long works nicely. I use the testing jig so the students can develop compressive strength data for the Laser Cut Truss Challenge (handout attached), but it could be used just to teach about moments.
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