Hi Ken, That is a good idea!!! Isn't it possible to use a stepper motor as a pulse generator? If so, wouldn't it be possible to variably bias that same stepper to achieve the haptic feedback? thanks for the idea Stuart
On Fri, Oct 1, 2010 at 7:45 PM, Kenneth Lerman <kenneth.ler...@se-ltd.com>wrote: > > 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 > -- dos centavos ------------------------------------------------------------------------------ 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
