Thanks for the lead Tony. I cruised some of the Honeywell sensor pages and the Digikey catalog page with the 1GP4001 on it. I had studied the previous Digikey page because I was interested in the Honeywell 103SR13A-1 which are installed on my Hardinge lathe. I am guessing that for rigid tapping that the sensor will need the zero speed feature. It did not seem obvious to me which sensors where zero speed capable. What should I look for that would indicate this?
This has gotten me to thinking about magnetism. My first guess with flag sensors was that a ferrous flag would bridge the magnetic gap between a magnet and a Hall sensor, so I set up a magnet and a 103SR such that the magnet was just out of range to the sensor. When I placed a small screw driver in between, I expected to trigger the sensor, but it didn't. Then I placed the magnet in range, triggering the sensor, replaced the screwdriver, which deactivated the sensor. So the flag seems to block or perturb the magnetic field instead of conducting it. Which also makes sense, but is not what I would have guessed. This magnetism is weird stuff. Kirk ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On Tue, 2007-12-04 at 16:53 -0600, Tony Bussan wrote: > Check out something like a Honeywell 1GP4001. They are in a sealed can with > the back bias magnet. Digikey has them for about $7. There are other > models and more expensive housed models also. Some are good down to zero > speed, some are not. I can find out more info if you like. I design speed > and position sensors there. > > > Tony > > Disclamer: My views do not reflect those of my employer. > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Kirk Wallace > Sent: Monday, December 03, 2007 12:26 PM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] Magnetic Geartooth Sensor for Spindle > > Has anyone tried using a magnetic sensor such as a crankshaft position > sensor for a spindle encoder? I would not have to protect this > arrangement nearly so well as an optical system against oil and dirt. > > Initially, I found this part - AKL001-12E: > > http://www.nve.com/Downloads/gtsensor_catalog.pdf > > The "gear" and bias magnet would be easy to make and mount. I guess the > tricky part is in dealing with the analog nature of the sensor, which > means more than one or two components to wire, but no big deal. > ------------------------------------------------------------------------- SF.Net email is sponsored by: The Future of Linux Business White Paper from Novell. From the desktop to the data center, Linux is going mainstream. Let it simplify your IT future. http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
