I had a thought about that and there is one BUT... I am going to use stepper motor to control the rotary axis and as far as i know there is only one way to create a closed loop system - EMC outputs PWM signal and receives encoder data and then there has to be PWM-to-step signal converter.
Viesturs 2010/5/14 dave <[email protected]>: > Maybe this is the place to use an absolute encoder? Just an off the wall > thought. > > Dave > > > On Fri, 2010-05-14 at 10:59 -0400, Cal Grandy wrote: >> You might consider homing the head prior to energizing the high pressure >> hoses. Only a sequence control. >> >> >> ----- Original Message ----- >> From: "Viesturs Lacis" <[email protected]> >> To: "Enhanced Machine Controller (EMC)" <[email protected]> >> Sent: Friday, May 14, 2010 7:35 >> Subject: Re: [Emc-users] Homing of rotary axis >> >> >> 2010/5/14 Andy Pugh <[email protected]>: >> > On 14 May 2010 00:16, <[email protected]> wrote: >> > >> > >> > >> > (Ian, your idea would work fine too, but he asked to minimise the >> > amount of movement that his hoses are subjected to) >> > >> >> Yes, the essence is that I do not want the head to tilt those 50 >> degrees (which is maximum tilt angle) every time i turn on the >> machine, because it puts a lot of stress to high-pressure tubing >> (water pressure reaches ~4000 bar). >> >> Ian, thank You for a suggestion on playing with HOME_OFFSET value for >> fine-tuning the home position. I find that in some cases it might be >> easier than adjusting the home switch itself. >> >> > I think it need be nothing more complex than a semi-circular metal disc on >> > the rear shaft >> > extension of the motor and an optical slot detector. >> >> Yes, it seems like a pretty simple setup to me too, Thank You for an idea! >> >> Viesturs >> >> ------------------------------------------------------------------------------ >> >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> >> >> ------------------------------------------------------------------------------ >> >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > ------------------------------------------------------------------------------ > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
