http://tech.groups.yahoo.com/group/CNCPro/ CNCPro Thu, 19 Nov 2009 13:41:37 GMT Z P http://tech.groups.yahoo.com/group/CNCPro/message/1514 http://tech.groups.yahoo.com/group/CNCPro/message/1514 There are the so called rate multiplier chips in both binary and BCD format where a clock is applied to the chip and an output pulse train ensues. The output Thu, 19 Nov 2009 13:01:38 GMT Andrew Mathison http://tech.groups.yahoo.com/group/CNCPro/message/1513 http://tech.groups.yahoo.com/group/CNCPro/message/1513 Hi Rich Dean You wrote:- Are you aware that USDigital sells a chip that takes their encoder inputs and multiplies by any factor you program it to? This makes a Wed, 18 Nov 2009 06:27:29 GMT Roland Jollivet http://tech.groups.yahoo.com/group/CNCPro/message/1512 http://tech.groups.yahoo.com/group/CNCPro/message/1512 I'm sure that applies to closed loop servo's that do use encoders. So it simply injects pulses so the software 'corrects' the motor position until it's where Wed, 18 Nov 2009 04:58:41 GMT Tracy Presnell http://tech.groups.yahoo.com/group/CNCPro/message/1511 http://tech.groups.yahoo.com/group/CNCPro/message/1511 With CNC Pro, that's how I do it. Jog to the part and input the offset from 0 (again, I use the home switches as M53 origin or 0,0,0) into M5X that I call in Wed, 18 Nov 2009 04:47:06 GMT Rich Dean http://tech.groups.yahoo.com/group/CNCPro/message/1510 http://tech.groups.yahoo.com/group/CNCPro/message/1510 Tracy, Assuming you have set zero to a fixture then use the jog to the part Z and read the display. Input the diff in the tool table. A slow jog rate will get Wed, 18 Nov 2009 01:57:40 GMT Tracy Presnell http://tech.groups.yahoo.com/group/CNCPro/message/1509 http://tech.groups.yahoo.com/group/CNCPro/message/1509 Rich, Okay, for that it would be fine. But, if I'm using the MPG to set up the Z tool offset, I want to know what the amount moved it so that I can enter it in Wed, 18 Nov 2009 01:47:06 GMT Rich Dean http://tech.groups.yahoo.com/group/CNCPro/message/1508 http://tech.groups.yahoo.com/group/CNCPro/message/1508 Tracy, Well, usually I don't care how far I moved an axis from a previous point, only that it moves in precise known steps as I seek a new point or add an Wed, 18 Nov 2009 01:33:17 GMT Tracy Presnell http://tech.groups.yahoo.com/group/CNCPro/message/1507 http://tech.groups.yahoo.com/group/CNCPro/message/1507 Okay. But, if the computer isn't involved with the MPG then how does it know how far it moved to update the program? Maybe I don't understand. Tracy Wed, 18 Nov 2009 01:26:35 GMT Rich Dean http://tech.groups.yahoo.com/group/CNCPro/message/1506 http://tech.groups.yahoo.com/group/CNCPro/message/1506 Tracy & all, Are you aware that USDigital sells a chip that takes their encoder inputs and multiplies by any factor you program it to? This makes a stand alone Wed, 18 Nov 2009 01:11:55 GMT Tracy Presnell http://tech.groups.yahoo.com/group/CNCPro/message/1505 http://tech.groups.yahoo.com/group/CNCPro/message/1505 Gary, I was responding to your comment, --"BTW even if the MPG generates the pulses directly, there is likely to be intelligence in the device in the form of a Wed, 18 Nov 2009 01:05:53 GMT Tracy Presnell http://tech.groups.yahoo.com/group/CNCPro/message/1504 http://tech.groups.yahoo.com/group/CNCPro/message/1504 Dean, One click on the wheel is configurable in the software to be whatever you want it to be. Of course, you have to take into account the ability of the Wed, 18 Nov 2009 01:03:59 GMT gary http://tech.groups.yahoo.com/group/CNCPro/message/1503 http://tech.groups.yahoo.com/group/CNCPro/message/1503 Rich, Yep, understood, I can see the use of that for sure, but note also that a key press is also tactile, i.e. one press is equivalent to one "click" - note Wed, 18 Nov 2009 00:57:15 GMT gary http://tech.groups.yahoo.com/group/CNCPro/message/1502 http://tech.groups.yahoo.com/group/CNCPro/message/1502 Hi Tracy, Not sure exactly what you are saying there (or at least the point you are trying to make), that's how virtually all peripherals interact with the Wed, 18 Nov 2009 00:54:45 GMT Rich Dean http://tech.groups.yahoo.com/group/CNCPro/message/1501 http://tech.groups.yahoo.com/group/CNCPro/message/1501 Tracy, so, how is the MPG dial calibrated for a specific increment? Increment and rate are two different things. -=RichD=- Wed, 18 Nov 2009 00:47:12 GMT Rich Dean http://tech.groups.yahoo.com/group/CNCPro/message/1500 http://tech.groups.yahoo.com/group/CNCPro/message/1500 Gary, Re: the detent. It is absolutely necessary. When I turn the dial and feel one "click" I know I have inputted the selected increment without looking at