Hi Stuart, If you are going to do some computer assisted hand tapping, you might want to add some haptic feedback. If you measure the spindle current and use that as a measure of load, you could drive a small servo connected to the mpg and use it as a brake. If you make the braking force proportional to the spindle load, that might let you "feel" when the tap gets dull or jams on chips.
Regards, Ken On 09/30/2010 09:41 AM, Stuart Stevenson wrote: > Gentlemen, > I am working on a project on the Enshu. I am not sure how valuable it will > be but I sure want to try it. I want to tap threads using the MPG. > The spindle drive is a full servo. The spindle motor has a resolver for > feedback to the spindle drive. The EMC2 DAC signal to the spindle drive is > +-10V. I have found a quadrature signal out of the spindle drive. This > spindle drive uses the resolver feedback to generate this quadrature signal > (A and B). The spindle has a prox and amplifier that feeds a signal into a > daughterboard on the spindle drive for spindle orientation during tool > change. The daughter board has a pin that outputs a pulse once per > revolution corresponding to the radial position of the spindle. I intend to > use the A and B as encoder feedback into EMC and the orientation pulse as an > index pulse into EMC. This will allow full servo control of the spindle as a > C axis. > I would like ideas on the best way to implement this. I would like to have > the spindle set up as a C axis but without a C axis display on the screen > (unless I am using the C axis as an actual C axis but that is another > project). I don't think I NEED any display for the spindle for this project. > I think I would like to be able to command a G code to engage the spindle > and an F code for feedrate to move the C and Z in a coordinated fashion. > Maybe I am thinking backwards. Maybe driving the Z axis with the MPG and the > C (spindle) coordinated with the Z is the best way. > Since I am thinking 'manual' then maybe a button is better than a G code. > If I had a button how would I tell the machine the pitch of the thread? > Maybe a screen display like the FO/SO/MV displays. This would adjust in > proper increments per the chosen units and allow the MPG to set the pitch > prior to engaging the coordination button. > thoughts - comments - ideas > thanks > Stuart > > ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
