Hey gene and peter. Well that's good to know that the ency card only supports 5v. So that's a no show. All good I'll use them for something else I guess.
So gene. First off my encoder has a b Z push pull single ended outputs. Looks like your solution is the plan. I have a spindle sensor already on the spindle. And my vfd can output a and b signals. Fine. Just no Z signals. So I'll use A and B for speed and the proxy sensor for rigid tapping plus spindle orientation. I'll be in touch in a few days. Once I get this encoder card working. Regards Andrew On Thu, 15 Apr 2021, 4:34 PM Gene Heskett, <[email protected]> wrote: > On Wednesday 14 April 2021 23:15:56 andrew beck wrote: > > > Hey guys > > > > looking for info on how to wire up a mesa ency encoder card to my vfd. > > > > I have a encoder card that outputs 12v to the encoder that I have > > (which is also a 12 v encoder) but would like to split the encoder > > pulses off to my 7i77 as well as back to schiender altivar 71 vfd. > > > > the vfd does output the encoder pulses but won't output the z pulse so > > I am thinking of using the ENCY card to allow me to tap in to signals. > > > > couple of questions > > > > 1 does the ency card handle 12v > > > > 2 what is the best way to wire it up. I have a standard quad encoder > > but with push pull outputs > > > > regards > > > > Andrew > > You are not teling us if the encoder you have is an A/B/Z encoder > Some where, if you want well behaved systems, you MUST have an index > signal, preferably one related to the spindle on a 1 to 1 basis. If you > want to do threading, you must make this so. > > When I decided my optical encoder just plain had too much quantization > noise to do a good job, the next most obvious place to put a higher > resolution encoder was not on my milling machines spindle but on he > spindle motor by drilling and tapping the rear of the shaft and making > an extension to it to drive the encoder, which I bought on ebay for a > $20 bill. A 1024 line encoder. But when it arrived, it was a > differential output and the mesa card I was using at the time was a TTL > input, but $4 worth of rs485 to translate the differential into a single > ended TTL fixed that right up. But that left me without a spindle > inedx, the Z in this equation. So I gooped a screw to the side of the > drawbar cap in the mill, and put an ATS-667 hall effect to watch it pass > by once per revolution of the spindle. So that gave me an index. But > what to use for a scale, and what do I do about the fact that the G0704 > has a two speed head And the working scale, due to the gear ratios in > the head, is a 4 or 5 digit number depending on the gear its in. > > Developing the two scale factors I needed was a matter of hooking up a > counter to one leg of the encoder, and some hal logic to record the > counter at turn 3, run it to 103, then subracting the counter reading at > turn 3 from the counter reading at turn 103, and dividing that by 100, > giving the needed scale ratios. Some more hal trickery to complete that > based on 2 switches I put on the gear shift knob that tells hal when it > is fully engaged and which gear its in. An added bonus for when its not > fully in gear is that I keep the motor running at about 20 rpm when it > not in gear, and the servo response is milliseconds, I can be singing at > 3000 revs, reach up and turn the gearshift knob, the first 2 degrees of > it slows the motor to a crawl, and the other gears teeth engage silently > because they ae moving so slow, and when its finally fully engaged, the > other switch reapplies the motors requested speed, and 30 milliseconds > later the tach says 1500 revs. Or vice-versa. > > Because the quantization noise is reduced by a factor of several hundred > by the much higher encoder resolution, the servo no longer rattles the > head gears, making a sound like the bearing balls are square, and runs > dead silent now. > > Anyone who wants to know how I did that is welcome to PM me asking for > the ini and hal files that make it happen. The same basic solution can > do what you want to do Andrew. > > 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 > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
