I often incorporate a slot inside the gear or pulley (like a keyway) the width of a nut. Slip a nut down the slot and screw the set screw into the nut through a radial hole. Now the force is between the nut face and the plastic part (compression) rather than on fragile threads in the plastic.
-- Ralph ________________________________________ From: andy pugh [bodge...@gmail.com] Sent: Wednesday, May 27, 2020 6:21 PM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] FERROR MIN_FERROR value? CAUTION: This email originated from outside the Walla Walla University email system. On Thu, 28 May 2020 at 01:13, Chris Albertson <albertson.ch...@gmail.com> wrote: > By total coincidence, I just made both. I needed 30T, 40T, and 60T > pulleys. I tried printing them and they fail after a while. The plastic > simply will not hold the set screw then they slip on the shaft. There was an interesting solution to this on Hackaday a while back: https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Fhackaday.com%2F2019%2F09%2F02%2Fmisuse-this-part-to-attach-3d-printed-stuff-to-a-shaft%2F&data=02%7C01%7Cralph.stirling%40wallawalla.edu%7C02de9b609b9b498e7b4508d802a587de%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637262257266623247&sdata=qvWd3EZgslDbfuG%2FV0drXHQ4gcygHBIGL50GhDaClgU%3D&reserved=0 -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam05.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=02%7C01%7Cralph.stirling%40wallawalla.edu%7C02de9b609b9b498e7b4508d802a587de%7Cd958f048e43142779c8debfb75e7aa64%7C0%7C0%7C637262257266623247&sdata=BKeFz5Nd9F6RtAlHZjFL9JwOwe9IpdtI%2B4amign3kzg%3D&reserved=0 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
