2014-11-25 18:19 GMT-03:00 Dave Cole <[email protected]>: > Since you have limited availability of local parts; you might want to > consider using some automotive sensors such as the camshaft and > crankshaft sensors used by most cars these days. > > I've replaced some on Fords over the years and they typically fit into a > hole recess in the engine block and extend to sense a gear or segmented > ring. Around here (Midwest USA) I have seen them as cheap as $15 or > so. I believe the sensors I was checking/replacing were run off 5 volt > power, so they should not be difficult to interface. Apparently the > Ford sensors I was testing were hall effect sensors. > > More cam and crank sensor info that you probably need. > > http://www.aa1car.com/library/crank_sensors.htm > > http://easyautodiagnostics.com/misc-index/ckp-cmp-sensor-basics-1 > > If you stagger two hall effect sensors on a gear so they are out of > phase by 90 degrees, you can create a full quadrature signal fairly easily. > > If you have a timing belt pulley, that may work as well. >
Well for the Mazak I can still use the original encoder since I can scale it, even if it's not that exact. But I'm giving it a try since it's already there. I'm planning on using some sensor like the ones you mentioned for the heat treating machine we're finishing to retrofitt because I have some of these encoders without index pulse. The maing thing is I need to position the cam to get a homogeneous heat around the profile. The idea of making the 360 teeht gear is not out of the question either, but I think I'm going to use the encoder and add the physical index with a hall sensor. Here's a link of the process with a round coil, the idea is to use coils with the shape of the lobe. The problem of the non homogeneous occurs more with high lift camshaft. http://youtu.be/RmW3_c0-4Oc. -- *Leonardo Marsaglia*. ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
