On Tuesday 24 November 2020 21:15:31 John Figie wrote: > Andy, > > Thanks for the suggestions, I think that is really helpful. I will > have to look at the docs for this stuff. > > As for the lathe it is actually a model 1550 NC even though the swing > is 14". I have the manual for it and it has a complete parts breakdown > with illustrations. It looks like the original machine had encoders. > The spindle encoder is still on the machine and I think it is the > original The encoder for the main leadscrew was mounted at the end of > the screw but it doesn't look like the original. > The manual also says the "parts shown" are for serial numbers 1550001 > - to _______. Note that I have number 1550003. The way some of the > limit switches were mounted and wired using conduit fittings seemed > kind of "home brew" to me, but functional, and when I look at the > manual it looks like that is really the way this machine was made. > I am really excited about the thought of getting this machine running. > Being a 1972 model machine, the tool capability is kind of limited. > There are only 4 tool positions and it would be difficult to rework > the tool post to accept some kind of quick change tooling, but I will > deal with that after I get it running. The DC spindle motor and > variable speed (mechanical) drive has been replaced with a 5 Hp 3 > phase induction motor. The lathe also has a 3 speed gear box > incorporated into the headstock. > Thats a great candidate to retrofit with a vfd, but I wouldn't change the motor just yet, a new technology has recently come down the pike thats a bit more efficient AND synchronous. Give it 5 years to wear off the luster and then replace it. The new tech promises to be much more efficient at the lower speeds.
And Andy is more familiar with Mesa stuff than I'll ever be. His advice is good. > John Figie > > On Tue, Nov 24, 2020 at 5:07 PM andy pugh <bodge...@gmail.com> wrote: > > On Tue, 24 Nov 2020 at 20:25, John Figie <zephyr9...@gmail.com> wrote: > > > I am thinking that I want to use Mesa Etherent I/O cards and I > > > want to > > > > use > > > > > PID servo control. > > > > > > About the motors: These are Peerless DC motors (8 brushes). 66V > > > max and 3.75 Amps Max. 800 RPM coupled directly to the ball screws > > > with a servo coupling. > > > > Mesa have a suitable dual-motor servo drive, the 7i40HV: > > > > http://store.mesanet.com/index.php?route=product/product&path=83_90&; > >product_id=147 > > > > That pretty-much puts you in the 50-pin-header section of the Mesa > > catalogue, so as the main FPGA card your choices (using Ethernet) > > are 7i93 (headers for two cards) or 7i80HD (headers for 3 cards, and > > available with two different FPGA sizes) > > > > http://store.mesanet.com/index.php?route=product/product&path=83_85&; > >product_id=341 > > > > http://store.mesanet.com/index.php?route=product/product&path=83_85&; > >product_id=62 > > > > The 7i40 includes an interface for incremental encoders, so you > > would probably just need to choose a generic IO board such as the > > 7i37TA to complete the system. > > (Or you could go with a 7i44 and a bunch of smart-serial > > peripherals) > > > > The 7i40 manual is not linked from the product page (something of an > > oversight, PCW) but is here: > > http://www.mesanet.com/pdf/motion/7i40man.pdf > > > > The 7i40 will work with any firmware with "SV" in the bitfile name, > > so despite the fact that it is not mentioned in the 7i40 manual, the > > 7i80HD with the 7i80hd_16_sv12 would be able to drive up to 12 > > motors via 6x7i40 cards. > > In practice you would "turn off" the other potential "SV" sections > > to use the pins as GPIO for the other cards. > > > > It looks like you can probably use the 7i80HD-16 unless you need to > > use a 7i49 card to read resolvers. > > Which begs the question, what was the feedback method used when the > > lathe was new? > > > > Similarly the 7i93 appears to have SV and SVRM (servo/resolver) > > bitfiles available so should work. > > > > -- > > atp > > "A motorcycle is a bicycle with a pandemonium attachment and is > > designed for the especial use of mechanical geniuses, daredevils and > > lunatics." > > — George Fitch, Atlanta Constitution Newspaper, 1912 > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > _______________________________________________ > 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
