On Saturday 24 August 2019 01:53:28 John Dammeyer wrote: > > > Now just to change the 5 Volt PWM into 0V to 10V analogue. > > > > Thats a mesa spinx1. > > > > > > Cheers, Gene Heskett > > -- > > That's more than $100Cdn with exchange rate and shipping compared to a > few dollars and some protoboard.
Crazy! Last time I bought one it was about an $18 bill. Several other of our suppliers have similar priced products, albeit not quite as linear as the spinx1. $24 and ship to the lower 48 right now. > But, in case you missed some of my > other postings under this subject line. The goal is to create a > workable document for someone who has(had) a functioning WIN-XP/MACH3 > system that no longer works and help them migrate with minimal cost to > LinuxCNC. No new BoB. If they were using a VFD with PWM to 0-10V (a > checkbox in MACH3) with a parallel port then they have the hardware. That 0-10 volts is not built into the bob that seems to come with most machines already setup for mach. It is however not reverse-able, nor capable of speed control, which is done from the knob on the box. I fought with everything in that control box that came with the 6040 mill and finally threw it all away, That 24 volt motor power supply for instance, folded back to around 13 volts when the A axis was plugged in. And I didn't trust the tb6550 drivers, so I went out to the shop and got the motor driver kit I had been using on the micromill for a decade. which had a 28 volt, 12.5 amp supply, 4 2M542 drivers, and a bob for one parport in it. Its computer already had a 5i25 in it, so I bought 2 7i76's, rewrote the 5i25's and made 2 boxes, one to run the 6040 with, and one to run the G0704 with. I removed the bob from that box, so now it has a bunch of white cables reaching to 7i76. A sainsmart bob also lives there with the 7i76 for further expansion. Then while I'm in the horsepistol for a ticker tuneup, had a heart attack they aren't done fixing yet, lightning got the old del running the G0704, and I've not brought it back to life yet. Probably the psu, which I should have a spare for. Power led color stuck on yellow. Goes on and off according to the 4 seconds on the button rule, but no further activity. > I already have my mill running with a single parallel port but the > single phase motor is still controlled with a switch because I'm too > lazy to temporarily wire in a relay. What I do have for my mill is a > sweet Bergerda 1.8kW AC Servo that works very nicely with step/dir > signals and has a 2500 line encoder (10,000 pulses per rev) which > means it needs more than the parallel port can deliver. Yes, that encoder will run out of bandwidth trying to get thru that bobs opto-iso circuitry. So you are out the cost of at least a 5i25 which has at least 100x more bandwidth at its encoder inputs. I've had to cut and bypass the opto crap on the bobs several times now. I am a CET, but many machinists far more capable than I at turning cranks, wouldn't feel comfortable doing such hacking. > So that means > a Smooth Stepper and MACH3 or the MESA 7i92H which is the cheaper > option and plugs directly into my existing BoB. (part of the > criteria). I'll have to look at the 7i92. Just did, wouldn't consider it as it would tie up the single net port on most motherboards. I consider a working network a requirement and all my machines can browse the net. And sitting in in the middle of ones NAT-ed address block would mean it has to share net space with all that traffic. Scary at the crosstalk possibilities. Druther not. From the computer running that machine to the machine is 100% private. I haven't looked at it from that angle. Its a one time expense, which if it makes the job easier, is for me an automatic go. So the worthless, uncontrollable 110 volt vfd that came with the 6040 now is a $110 clone from ebay in the dark brown box, and 100% controllable with a spinx1. And the 7i76 gives me controls for the spindle motor coolant pump, and the air for the mister & individual home switches and at least a dozen other things I have yet to build, like tool changers. All I have to do is last long enough to get it done. But with the ticker waiting on a new aortic valve, as this one is pumping at about 30% efficiency, so I'm not exerting myself. ATM I look like your grandmothers pin cushion, and have yet to remove the patch just above the fold crease of my right leg, which they will use again in about 2 weeks to implant the new valve. Sounds crazy, but that valve fix is today an outpatient cath-lab job. > As long as LinuxCNC can create the correct step/dir pulses then open > loop tapping should be possible. But even if not, the Bergerda drive > can output it's encoder pulses scaled by a numuerator/denominator set > of parameters so that can be fed back to through the 7i92H. > > I have started on the conversion document. But it will be a while > yet. Have to make a mount for the new motor and cast and machine a > pulley to give me 1:1. Then I'll have 0 to 3000 RPM on the spindle. > > John > Take care John. And I'm sure I'll learn something from it. > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users 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) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
