This is the only axis that needs to be homed. The pen must be adjustable to get to the exact center of the coaster or the drawing will be distorted. It has a slotted mounting hole that lets the arm rotate. The belt is a cut pieces with the ends clamped at the carriage. This is a belt driven, cantilevered arm that uses 6mm shafts and linear bearings. The bed connects to the motor pulley with a closed loop belt. It has little springy fingers that grip the coaster when it is on the bed. They have little shafts that snap into the base. There are (3) 3mm bearings on the bed perimeter that provide support and keep it level. The base of the machine has two stacked 5mm bearings in the center for the bed to rotate on. I already have a laser cutter for square coasters and I wanted to try something unique for round coaster. I designed this machine to draw custom, round drink coasters.
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