Stuart, See:
http://deepblue.lib.umich.edu/bitstream/2027.42/60859/1/paulgrif_1.pdf Figure 2.1 Ken On 10/01/2010 09:32 PM, Stuart Stevenson wrote: > 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 >> >> > > > ------------------------------------------------------------------------------ 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
