Mazak Impulse - Oak retrofit build log

All things related to Centroid Oak, Allin1DC, MPU11 and Legacy products

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ashesman
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Re: Mazak Impulse - Oak retrofit build log

Post by ashesman »

tblough wrote: Tue Nov 02, 2021 7:56 am3M VHB tape?
IGood ideas. I had originally thought about tape but the screen brackets are there to stiffen up the front so wanted a more rigid joint. Although with that much tape it would probably be ok..

Maybe I should do some tests on some tape.
ashesman
Posts: 274
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Re: Mazak Impulse - Oak retrofit build log

Post by ashesman »

cncsnw wrote: Tue Nov 02, 2021 1:36 pm
ashesman wrote:After a fair bit of testing, I am pretty sure there is something gammy in Centroids spindle encoder zeroing function M150.
Does the problem only show up when the spindle has been running at comparatively high speed?

Try adding logic that ensures the spindle speed is below around 2000 RPM before you call M150.
I do the orient at 200 RPM. Or maybe 100. The spindle turns smoothly. I tried adding extra time to make sure it was turning at a stable speed. The key thing here is how it zeros exactly 90, 180, 270 degrees from where it should sometimes. I didnt even go any further with it. I know the signals are ok and I know centroid wont help so I sucked it up and replaced the VFD with a C2000 that will do the orient itself.
Titleiiarms
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Re: Mazak Impulse - Oak retrofit build log

Post by Titleiiarms »

Cant remember your spindle setup and its too late now that you bit the bullet for a new VFD.. But I noted on my Comet/Viper conversion the old control setup/VFD drive used a seperate mag pickup attached to the the spindle shaft just below the belt drive. Had a curved magnet screwed right to it and a seperate encoder box to output the orient signals. I almost used it till I finally got the Yaskawa A1000 and add on board and then add on software/firmware to enable the card :) Pain it the rear but its slick once it works.
Guy
Titleiiarms
Dilliner, PA
tblough
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Re: Mazak Impulse - Oak retrofit build log

Post by tblough »

ashesman wrote: Tue Nov 02, 2021 2:37 pm
tblough wrote: Tue Nov 02, 2021 7:56 am3M VHB tape?
IGood ideas. I had originally thought about tape but the screen brackets are there to stiffen up the front so wanted a more rigid joint. Although with that much tape it would probably be ok..

Maybe I should do some tests on some tape.
Another option would be to plug weld them from the back.
Cheers,

Tom
Confidence is the feeling you have before you fully understand the situation.
I have CDO. It's like OCD, but the letters are where they should be.
ashesman
Posts: 274
Joined: Thu Dec 03, 2020 4:54 am
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Re: Mazak Impulse - Oak retrofit build log

Post by ashesman »

tblough wrote: Tue Nov 02, 2021 7:31 pm
ashesman wrote: Tue Nov 02, 2021 2:37 pm
tblough wrote: Tue Nov 02, 2021 7:56 am3M VHB tape?
IGood ideas. I had originally thought about tape but the screen brackets are there to stiffen up the front so wanted a more rigid joint. Although with that much tape it would probably be ok..

Maybe I should do some tests on some tape.
Another option would be to plug weld them from the back.
I did plug weld all the others from the back with TIG. The mark on the outside is minimal but still probably noticable. I was hoping to powder coat it so can't use any fillers on the outside. I also can't get down the sides of the screen to weld unfortunately.
ashesman
Posts: 274
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Re: Mazak Impulse - Oak retrofit build log

Post by ashesman »

I finally feel like I had a win today! After five VFDs, I finally have one that does everything properly. Well close enough anyway. It was a surprisingly large amount of work to get the Delta C2000 installed, wired and configured. There are no setup examples for tuning it nicely on an AC servo motor but eventually I got there.

I was also able to get rid of my PID loop for orientation in the Oak PLC too which was nice. It worked OK until it turned out there was a bug in the Oak where it did not zero the spindle encoder correctly every time! Took quite a bit of PLC code changes and testing to get it all back to a simple old digital IO orient!

Anyway, Delta C2000 is done. I think that the Hitachi SJ-P1 is a nicer VFD in almost every respect and would recommend it as my first option to anyone running an induction motor with/without orient or PM motor without orient. It is nicer to configure, has useable PC software with a USB cable, nicer wiring terminals and accessibility. Everything about it right from the packaging boasts higher quality. Was the same price too.
20211113_184450[1].jpg
Anyways, here is an example video of the C2000 running and orienting. 6000 RPM, 0.35s acceleration/deceleration times.



Now I can finally get back to finishing my control panel. God I know how to make a project take a long time!!!
Titleiiarms
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Re: Mazak Impulse - Oak retrofit build log

Post by Titleiiarms »

Looking Good ! Love the persitence... I think we all go into these conversions with a plan for project costs and amount of time needed, then it gets blown clear out of the water in our pursuit to end up what we invisioned in the first place. Its a fun learning experience ( and costly at times) but we can take pride in what we created and actually fix the stuff that breaks down the road since we built it.. I know if I had to do it again with the same machine, it would go ten times faster. I enjoyed the conversion ( most of the time) but I did it to make a useless machine that had been a 9K lb boat anchor into a money making machine, and its starting to do that now .
Guy
Titleiiarms
Dilliner, PA
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