Bar feeder (want it to poke part every run)

qc machinist said:

I am wanting to check bar length every part because sometimes the count can be off from messing with the program trying different tools/paths or even different order of operations trying to get it dialed in for production.

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Ox said:

Is your unit currently just loading the new bar, and then "counting down" as you pull with the sub maybe?

Again - IDK your unit, but my guess is that must be how your unit is set up, and you likely need to go though the SETTINGS and tell it that you want it to push the bar out each cycle.

I'm not sure if there is such a setting for not pushing, but still checking?


IF you are pulling with the sub and are not pushing with the feeder for the porpoise of not buggering the pusher tip, what I doo is to pull with the sub at 100 RPM, and then speed up after the collet closes and a 1 sec dwell. Then the pusher will back off your preset distance while it speeds up.

Again - answering a vague question on an unknown unit, with LNS experience.


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Think Snow Eh!
Ox

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Rick Finsta said:

Well we have no idea what control your machine is running so you need to tell us that. DMG/Mori, last I checked, were Mitsubishi or Fanuc from Japan or Heidenhein or Siemens from Germany, with their CELOS overlay to standardize workflow between them. You need to know what macro capabilities you have, and how to program them.

Best option for you is probably to reach out to the company that supports your machine and get an applications engineer to help you write the macro.

Here is the basic logic I use with spindle-length bar-pulled material:
The operator enters starting bar length in Variable #501 (this way you can load partial bars)
The operator enters part length in Variable #502
If you are starting a new parts counter, the operator sets #507 to zero

At the start of the program, or at bar change, a safe cutoff program is run (called as a subprogram or using logic to jump to and from a section after the M2/M30).

The program adds parting/facing/pullback to #502 and stores it in #503 (you can also use a separate variable for this instead of putting the value in the program but it doesn't matter)
The program removes the remnant from the bar length entered and stores this in #504
The program divides #504 by #503, drops the remainder, and sets this as #505 (total parts it will try to machine from the bar, you can omit this or put a block skip on this and manually set this variable to a number of parts desired if you like)
The program sets #506 to zero (this is just to compare the counters to later on)

Now, you have a N01 return so the above logic is only executed upon program start, or upon loading a new bar.

The program subtracts one part length from the total remaining (sets #504 to #504 minus #503)
The program runs a check that #504 is equal to or greater than zero (there is enough material to make this part) and alarms if there is not enough material.

*Here is the machining code.*
The bar is either pulled out by #503 either before or after cutoff as applicable for your part (like if you do face work, then bar pull, then cutoff, versus bar pull all the way out and perform all machining operations)
*End of machining code*

The program adds one to #507 which is just your running parts total
The program subtracts one part form the total that were calculated to fit the bar (sets #505 to #505 minus one)
The program compares #505 to #506 - if #505 is less than or equal to #506, it jumps to the program end (say, N99) or bar change
Here, you have a jump back to N01

N99
Here, you have your end program code, including the machine updating #501 with whatever bar length exists in #504 after adding back your remnant (so that when you start again it will subtract the remnant - this is just so an operator can measure a bar and stick it in without having to remember to subtract the remnant length before entering #501).

M30

Here you have your safe cutoff, bar change, your alarm jumps, etc.

That's how I do it at least.

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qc machinist said:

Yes i'm pulling with the sub as i do not know how accurate the pusher is, we're running titanium so things could go bad fast. I didn't think about setting the barfeeder to push while still using the sub to pull. Does it check bar length every time when set to push the material. I really appreciate your help.

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