I just got done cobbling together a cheap power feed unit for my Unimat 3. I used nothing more than an Erector Set motor and 2 of the pulleys that come with most sets. The 1 to 1 pulley ratio actually seems like a nice speed. Can easily make multiple pullies to add options for different speeds. You can use a Unimat belt, too. Haven't tried it under resistance while making a cut yet, but it should do well with light cuts. The video looks like the feed is a bit herky-jerky, but that is just the video - it actually feeds very steadily. Any thoughts?
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