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Author Topic: HOLD machine via LPT pin?  (Read 8482 times)

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Re: HOLD machine via LPT pin?
« Reply #10 on: October 22, 2009, 04:19:11 PM »
If this is molded hot wire and from some case it isn't enough "hot" the shape will be deformed and all next process will be for nothing.


... sounds like you need to modulate the feedrate by tool condition.

High temperature -> High feedrate
Low temperature -> low feedrate.

Wasn't there a possibility to do a "feed per revolution" mode? (Hood?   >:D )
If so, you just needed to transform the hot wire temperature to spindle index pulses some way.   ;D

Konrad

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Re: HOLD machine via LPT pin?
« Reply #11 on: October 22, 2009, 04:23:01 PM »
G95 does feed per rev.

Will be very interested to see what your tests reveal, can see a few applications where it would be handy for me if it can do that :)

Hood

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Re: HOLD machine via LPT pin?
« Reply #12 on: October 22, 2009, 04:45:51 PM »
Just asked Art and he has said it halts immediately without deceleration.
Hood

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Re: HOLD machine via LPT pin?
« Reply #13 on: October 22, 2009, 04:50:40 PM »
 Vaklin
You could possibly do this in a similar way  as I do with the FRO pot, what I have is if the pot is put to zero a Brain will feedhold then when the pot is again increased the start button will be pressed via the brain and the motion will again start.
You could use an input instead of the pot, you need to look at other things in the Brain as well such as the FeedHold LED, this is so that it will only press the start if the feedhold LED is currently active thus avoiding false triggering.
Hood
Re: HOLD machine via LPT pin?
« Reply #14 on: October 22, 2009, 05:01:05 PM »
Konrad, I'm so happy you touched my sick theme from few months. Here is no spindle at all. But... almost all adequate CAM software hearing mill knows rotate tool. Especially checked SolidCAM. Next step to take a look to mastercam. In any case I'll cheat the software, but this is slow solution.

The described behavior has a lot of application. BTW if the stepper drivers are smart and checks the current in windings they will know is the step actually goes or not. Hold the step with the trigger until it done (some timeout, possible to done never) logic AND from all steppers and HOLD until all rest steps are present will prepare closed loop steppers. ;) For servos situation is bit different, but if one good guy has understood what I have talked, soon servo drivers will have two different pulse dependable closed loop controls. Unfortunately, for now I can't explain more about this feature, because I don't know will he does this or not.


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Hood, no buttons. This will be absolutely automatic solution. How often and how many times will present the "not ready" condition knows no one. Stupid is to stay near the machine to wait if this present or not. Also, temperature depends from what part of the tool is in use right now. High temperature will compensate with low heating PWM, low one ... only with no movement until it normalized. Temperature is provisional in this explanation. Every condition which you want and can resolve is suitable.


----

Good is to know for missing deceleration. Important is to know after recovering machine starts on the same place with the rest of steps to done program line.

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Re: HOLD machine via LPT pin?
« Reply #15 on: October 22, 2009, 05:05:25 PM »
I was meaning an input from the tool to signal it was ready rather than just a button for the operator, some form of thermocouple possibly?

Hood
Re: HOLD machine via LPT pin?
« Reply #16 on: October 22, 2009, 06:07:04 PM »
How to measure is another question. In any case the signal is binary. Ready/ NOT Ready. Doesn't matter what this means relative to exact tool, motor or something more. Enough is to await until condition is normalized. Anyone can use it as wants. Just should to test, is solution explained by Konrad covers this. This feature can be used to hold the machine on the night with switch key too. End of working time, turn the key to hold, go to the home. On the next morning just turn the key to GO and go ahead :)

Funny and usable ...
Re: HOLD machine via LPT pin?
« Reply #17 on: October 23, 2009, 08:36:08 AM »
Just tested Konrad's solution. Works pretty fine! Stops after complete the step, next step pulse comes after recovery, no fluctuation...
Very useable for servo drivers with "not in place yet" output which are driving big tables... And for my strange needs is useable too.

10X Konrad!

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Re: HOLD machine via LPT pin?
« Reply #18 on: October 23, 2009, 10:36:14 AM »
Will be excellent if it is the case and there is no loss of position, only problem I have in my test so far is it screws up the SmoothStepper :(

Hood
Re: HOLD machine via LPT pin?
« Reply #19 on: October 23, 2009, 12:32:21 PM »
Ask the producer... Don't tell me the answer. I know. Every producer does THE BEST, doesn't change anything because of "support", because of lot of PCB's sold and ready for sale .... because they are doing for money :(
But, doesn't matter. In any case ask the producer... BTW, to be objective in your questions, can you add somewhere a big size photo of the solder and component side of the PCB. I want to take a look about architecture. 169 eur without delivery just to take a look is out of mind. After that we can discuss for what exactly you have paid and how to do it usable...