Hi, I have a question for you electronics experts out there...... I have added a little lathe to my mini-mill which I want to act both as an 'A' axis or an independent lathe. So, I would like to use the same stepper to drive the spindle in both cases. As it stands at the moment I have a driver board driving the 'A' axis as normal and a separate driver board fed from a simple oscillator for step generation feeding it as a lathe. Each driver ends in a plug so that I can unplug the lathe motor from the 'A' axis driver and plug it into the 'lathe' driver as I want. The problem I have is that the independent lathe driver doesn't have any ramping capability and so, to get the lathe running, I have to wind the multiturn speed pot right down, enable the driver, and then wind the pot back up slowly to the speed I want - the stepper won't start on its own at a high step rate. So, can anyone point me to some kind of suitable circuit (schematic) for a ramping oscillator to feed in the step pulses so that I can just turn it on at a preset final speed value and leave it to bring itself up to speed or suggest some other way of doping this thing? ( I wondered bout a PIC chip but I don't really understand them well enough yet..) Thanks....
-- Best wishes, Ian ____________ Ian W. Wright Sheffield UK "The difference between theory and practice is much smaller in theory than in practice..." ------------------------------------------------------------------------- Sponsored by: SourceForge.net Community Choice Awards: VOTE NOW! Studies have shown that voting for your favorite open source project, along with a healthy diet, reduces your potential for chronic lameness and boredom. Vote Now at http://www.sourceforge.net/community/cca08 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
