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Step 6Set up a tension pulley
Now we need to setup the tensioning pulley - this is to keep the belt tight enough to engage the stepper motor, regardless of any slop and inaccuracies in the build, but also shlould allow the belt to slip if something goes wrong, without breaking anything.
I soldered the third shaft (from previous step) onto some scrap metal (from an old heatsink) with a hole for a pivot at one end, and a hole for a spring at the other. I then used a screw to loosely mount one end, and the other it pulled by some springs (pulled from old pens) to keep the belt tight.
The tension is not very critical at all - you just need enough to make sure it doesn't slip.
I soldered the third shaft (from previous step) onto some scrap metal (from an old heatsink) with a hole for a pivot at one end, and a hole for a spring at the other. I then used a screw to loosely mount one end, and the other it pulled by some springs (pulled from old pens) to keep the belt tight.
The tension is not very critical at all - you just need enough to make sure it doesn't slip.
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