I made a worm gear assembly using the same components and played with the gear on ready rod (which i used to form the gear) , the thought of trying it as a rack setup had seriously crossed my mind and i was planning to try it on a small project that I've been chipping away at . I have no doubt it will work , the gear that i made was aluminum and I was wondering what the wear properties will be , now you've got me wondering how delrin would wear , i think it would have good wear but would probably strip a tooth easily .
keep us posted on how it works out for you
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