On Monday 07 April 2008, Mark Wendt (Contractor) wrote: >Bummer. It's got a good price tag on it, and for the machine I'm >planning on using it on, it would be economical. I'm trying to find >something like that which would be economical for a two-axis machine. > >Mark > >At 09:08 AM 4/7/2008, you wrote: >>This looks a lot like a device I tested a year ago with hal_inpt. >>Unfortunately, it did not work very well. Here's a link to the message >>I wrote at the time: >>http://www.mail-archive.com/[email protected]/msg02091.html >> >>Excerpt: >> While this device is recognized by hal_input, it behaves very >> oddly--the way it operates is at odds with other similar devices. I >> don't think this device would be useful with emc without >> device-specific hacks, and even then it would be problematic. Read >> on if you'd like a longer explanation. >> >>Jeff
The basic design reminds me of the jog dials we used for videotape editing, where the outside dial is center off speed dial with up to 5 speeds both ways depending on how far it was turned, and a center dial that just moved the tape a frame at a time, at about 8 frames a revolution. Unforch, and I have 3 of them, I find they are, by the time I get them, badly worn as they are all mechanical finger switches sliding on the contact pattern etched on the pcb. Cast pot metal frame, no real bearings and IIRC Panasonic wants about $130 a copy for replacements. So I shelved that idea, and now have plans to use some 24 volt steppers and generate a quadrature signal into a 2nd parport with them. These will be pure motor follows the generator jog though. But ATM I'd dead, the xylotex 4 axis board I put in a month ago broke a mirror and let all the smoke out yesterday evening while I was tapping the A axis into alignment with the x axis with a 4 oz wooden hammer. NDI why yet. But I will find out, and fix it, I am a C.E.T. Thinking out loud about how hal might work, could it be possible to convert the quadrature signals into a center off, jog either way speed dial in hal? That would I'd think, be handier than a pure follow action if there was a good distance to go, count the pulses up or down for the jog speed, one click=1 microstep per second, 10=10 per second? Oh oh, there I go, thinking again... What do you think of that idea, Chris Radek? -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) "All language designers are arrogant. Goes with the territory..." (By Larry Wall) ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Register now and save $200. Hurry, offer ends at 11:59 p.m., Monday, April 7! Use priority code J8TLD2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
