Friday, October 1, 2010
CNC axis full motion working
Wahoo! I finally reached the major milestone of having the slider+platform moving back and forth using the Arduino.
During this week I got the belt path system working which puts tension on the belt and maximises the surface-contact area of the sprocket drive. Mid-week I was able to just stick the belt to the ends of the axis and hook up the stepper to the Arduino through an H-Bridge. The rest of the week I developed a hook system on either end of the cnc axis which allows me to adjust the tension of the belt.
I have found if the belt is too lose the stepper skips teeth and the position of the axis is totally lost (I'm not using any kind of position feedback, so I have to rely on the stepper being exactly where it says it is). If the belt is too tight, the stepper cannot overcome the friction, and the coils just skip the step, which again causes me to lose calculated position.
With the end of the semester in sight I'm still unsure I will be able to get the typewriter concept going. At the moment I am completely pouring my efforts into the fabrication of the physical device, as I already know the software aspect is possible, and that is something that I can pull all-nighters on to get done. Fabrication can only happen during the limited hours of the 3D labs, so all my attention is on physical fabrication.
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