On Friday 04 September 2015 09:49:08 andy pugh wrote: > On 4 September 2015 at 14:40, Gene Heskett <[email protected]> wrote: > > Or a narrower, it might even slip > > before it destroys the motor, polygroove belt. > > This reminds me. My Holbrook has a Poly-V belt. It's probably bigger > than you are considering, despite only being a 9x20 lathe: > https://picasaweb.google.com/lh/photo/JsV7Nr5e3hKpspS7eWj5R9MTjNZETYmy >PJy0liipFm0?feat=directlink > > But indicates that at least one manufacturer thought it was a good > plan. That belt is _after_ the 2-speed reduction box. There are no > gears in the head.
That sure does sound like they had confidence in its never slipping. I swapped out an easily broken solid conductor cable for a stranded one, then hooked up my analog 100Mhz dual trace to see what sort of shape the quadrature was, jacked the opto's about 20 thou farther apart to get a very good 90 degree phase relationship, then tweaked the led brightness for a 50% duty cycle, and it ran well after shoving it back into its normal resting place, getting the end of a piece of 1/2" A2 trimmed to 9.998mms, making a good friction fit for a 10mm bore sprocket. Took that to the new mill and plowed a couple 1/8" grooves to match the setscrew locations, about 20 thou deep. Setscrews seem to lock it together pretty solid. Re-rigged a piece of .625 cold roll, intending to cut about 150 thou of 50 tpi threads to make the lock pin retainer of a spindle brake I have under construction. But the G76 won't run back to its starting position without a valid signal from a near module that is supposed to detect that the spindle is up to speed, so it hangs there forever. Fired up a copy of the hal-configuration, intending to fine tune the 5i25.0.pwmgen.00.scale so the spindle was a little closer to the right speed. And found a bug. It would not accept, from the hal-config command line, an adjustment of the "scale". Throwing the error box up but its too short to see the complete command line. Such stuff has worked quite well in the past. So I stopped LCNC, and changed the 1300 I had in that setting to 1200 in the .ini file just for effects. Restarted LCNC, rehomed & touched off to a reasonably accurate rod OD. But now the spindle won't run, no way, no how. Spins normally by hand. All the leds on the B.o.B. act normal, the fans sound like they are "at speed" too. So I turned off the accessory power and walked away to let everything cool. I need to find a nose bag for us anyway. This is, to make an understatement, frustrating. I'd have less trouble if I could find a 5 conductor stranded ribbon cable to replace the 4 conductor solid crap from radio shack, for use inside the box. Every other time I open the box lid, which has the BoB mounted on it, some wire breaks off the BoB. But it wasn't being exercised when it quit. Sigh... Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
