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2. Requirements | ||||||||
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I decided to use the same geared motor that I used for the Mark II Polymorph extruder?, as it is sturdy and very low cost. I also decided to use a slotted wheel and optical switching for detecting rotation, and further that the wheel should be printable using an everyday inkjet printer on the acetate sheets intended for overhead projectors. Finally I decided that to go for a resolution of 400 steps per revolution. That is the same as the steppers that Ed Sells and I are using for the first cartesian axes for RepRap as it gives us a linear axis resolution of 0.1mm, which is the RepRap target. | |||||||
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I decided to use the same geared motor that I used for the Mark II Polymorph extruder, as it is sturdy and very low cost. I also decided to use a slotted wheel and optical switching for detecting rotation, and further that the wheel should be printable using an everyday inkjet printer on the acetate sheets intended for overhead projectors. Finally I decided that to go for a resolution of 400 steps per revolution. That is the same as the steppers that Ed Sells and I are using for the first cartesian axes for RepRap as it gives us a linear axis resolution of 0.1mm, which is the RepRap target. | |||||||
3. The Slotted Wheel | ||||||||