Emcoturn 120 Using DMM DYN2 ZRI & Centroid ACORN for Accurate homing
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- เผยแพร่เมื่อ 21 ต.ค. 2024
- When used in conjuction with the mechanical limit switch, the marker pulse from the DYN2 drive and minor modification to the HOM file makes for a very accurate homing routine.
Yes ! Just did the same on my mill, took 5 minutes and repeats within microns. Not like with the inductive switches. Wish I could do the same on my lathe, Clearpaths need a second feedback line ... PS : all my ZRIs are wired on the same input, it does not seem to be a problem since they have no chance to remain closed.
Thank you. I did this too, It even works with dyn2 drives and home switch’s wired in series. Thank you
Kurt Kenyon, yep. It was enjoyable working with DMM and Centroid on this project.
Is there a way to do this with clear path servo or steppers? I have a lathe I’m converting and it has encoders mounted on the end of the ball screws. Could they be replaced with ones that have a zero reference point? I was leaning toward clear path’s but now I’m thinking this is going to be more reliable system.
Clear paths are good servos. Do you have an Emcoturn with the proximity sensor on the ballscrew pulleys? If so, you can use them as your "ZRI"
Marty, At the end of this video you have a picture of the wiring. One of the things I noted were the fuses that I assume are for the the three servo drivers. The question of how to fuse these control boxes is one I have had for a while. Is there a rule of thumb that can be used to size fuses? steve mckay
trottrr50 it's dependant on the size of the motors and voltage they run at.
Is a mechanical switch more consistently accurate than a proximity switch used for homing?
No, in my opinion a good proximity switch is more accurate for homing if set up properly
@@martyscncgarage5275 What's the typical accuracy of a proximity switch used for homing? For example would it be consistent enough to be able to continue working on a piece if the machine had to restart and rehome?
The best way to home a machine is to use a good mechanical switch to get it close, and the back off of it and search for the index pulse on the encoder of a servo motor. Next best would be a quality proximity sensor.
That's badass Marty. I'm going to do this on mine as well! How accurate is this ? Have you tested?
Ultra accurate homing using the marker pulse.
Hy Marty, did you find a solution for the toolchanger?
Yes. Just finished a video. I finished my Emcoturn 140. Same PLC. Waiting for Centroid to approve it. You will need ether1616
That's pretty cool!
I might do the same, at least this allows tool offsets to remain fairly spot on. It seems getting this level of accuracy or even near this with mechanical or optical (proximity) type switches is near on impossible. Plus, you then have servos :-)
Yes. Very accurate homing. If you guys from DMM, tell them Martyscncgarage referred ya!
@@martyscncgarage5275 thanks, have asked for some pricing. Need to decide between 400 and 750watt units. Harrison m300 conversion.
I think I would try and go for 750w direct drive or 400@2:1. If you don't need fast rapids then 400w should be ok.
Talk to Michael Tien at DMM let him know I referred you.
Thanks. The cost difference is not an issue, space might be tight but I can make a plan. Going 750W at least allows both options if needed.
Does this work for dual driven gantrys ?
janne k you mean like the Y axis gantry on a router? Yes it can pair motors. Please visit the Centroid CNC user forums, do your research and ask your questions there. centroidcncforum.com/viewforum.php?f=60
What i meant was, if i home such a gantry with dual motors and they both hit mechanical switches to then turn opposite direction until they find their own internal mark, isnt there a risk of one of them finding it say right away and the other perhaps going almost a full revolution making the gantry not square to the table ? Im sure im just having a brainfart and theres ways to account and adjust for this.
janne k take it to the Centroid User Forums, describe and ask your question there. Centroid staff monitors it
Ok will do. thanks.
The UCCNC is more userfriendly on the diagnostics screen