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Front Arm Crossbeam
This is the front crossbeam for the 'SG90 Sawtooth-Foot Inchworm Crawler' kit. It ties the horn-side drive arm and the idler-side swing arm to the front sawtooth foot. The plate is 40 x 80 x 6 mm with four 3.4 mm M3 clearance holes on the 30 x 20 mm foot pattern. It also has four 3.4 mm arm slots at x ±6 that run 15–33 mm out from the centre on each side, so the arm spacing can be adjusted. Each slot has a 6.5 mm wide, 3.5 mm deep counterbore underneath, which keeps the M3x16 screw heads flush against the foot.
🧩 Part of the SG90 Sawtooth-Foot Inchworm Crawler (ties both arms to the front foot) kit.
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