thanks all I will avoid the glue & imbalance problem by using optical reflector. Interesting, the epoxy putty toroid flew apart leaving a section that included the magnet. i concluded the bond to the steel was not uniform despite prep.. Now looking for opto and matte black paint. Thx TomP
On Sat, Nov 7, 2020 at 12:12 AM <[email protected]> wrote: > > How about *NOT* securing a magnet to the shaft? A magnet rotating at high > speed will probably cause a balance problem even if you can secure it. Use a > gear tooth sensor and mount a small steel gear on the shaft. Search Digikey > for "gear tooth sensor" (no quotation marks) for lots of sensors. > > -----Original Message----- > From: Thomas J Powderly <[email protected]> > Sent: November 6, 2020 11:50 AM > To: [email protected] > Subject: [Emc-developers] spindle speed hall sensor magnet > > I'm having trouble securing a magnet onto a trim router spindle shaft for > hall sensor rpm. > > I tried a 3m 2 part glue and a loctite kneadble epoxy putty, > > both blew up as i approached the 35000 rpm of the trim router. > > The control scheme works ( arduino with pid, pyvcp speed set and rpm meter, > zero cross detector opto triac ... ) > > Does anyone have suggestion for securing the magnet on the shaft? > > Is glue a solution? > > This is all manual work, no machine available. > > Magnet is 5mm dia x 3mm high neodynium on a 10 mm shaft, between end bearing > and brush. > > tia > > thx tomp > > > > > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers > > > > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
