I am going to make a motor cycle lift that uses an arm, which goes under the bike frame (and or wheels). The arm running on 25mm diameter nylon rollers will move up and down a piece of heavy section 50mm Square tubing. To lift and lower the arm it will be attached to a tube (approx 150mm long) with nuts at each end which is operated by a piece of threaded rod 800mm long turned by a half inch hand drill. Would 16mm ISO thread be OK or would ACME General thread be better. Would tapered bearings either end (say car wheel bearings) be the best way to handle the end thrust during operation? Any suggestions much appreciated. Bazzer
the question is who would be the last woman on earth MO
Never even thought about it but now that you brought it upwhat a freaking thought that is! No more other people, means no more food, no more shopping! I'd hang myself, lol.
Acme thread would be preferable to the ISO for repeated use and longevity of the lifting screw. Check the jack in your car boot and you'll see it's an acme thread. Mind the pitch and a nice zerk fitting somewhere to keep the rod greased would be nice. Tapered bearings are designed for just that, to handle large amounts of end thrust so your on the right track. The problem is with fitting a proper race for the bearing to sit in but something might be cobbled from an old brake rotor. good luck
i imagine it'd be pretty lonely and daunting. not much point of being around either, is there?
