topic Siemens 840C post processor in HSM Post Processor Forum

Siemens 840C post processor

KristianB95 — Thu, 22 Mar 2018 12:27:53 GMT

Hello,

I have a machine running with a Simens 840C controller from 1994.

I have made some changes based on a post processor for 840D, and another that I downloaded on this site.

Im nearly there, but still have a few problems, that i need solved.

This is how it looks, when i post atm.

%MPF1002
N10 (2. SIDE)
N11 (T42 D=16 CR=0 TAPER=90deg - ZMIN=-4.55 - spot drill)
N12 G90 G94
N13 G71
N14 G64
N15 G17
N16 G0 Z150 (I dont want this at the top, because it only moves in Z when changing tool in the start.)

N17 (Drill4)
N18 M9
N19 M6 T42 D42
N20 G64
N21 S497 M3
N22 G56
N23 G0 X7.5 Y-10
N24 G0 Z35
N25 M8
N26 G17
N27 F50
N29 G81 R2=3 R3=-4.55 R10=25
N30 X62.5
N31 G80
N35 G81 R2=3 R3=-4.35 R10=25
N36 X35 (This line need to be above N35, or els it will drill two times in X62.6 with conditions from first N29, and the N35 )
N37 G80
N38 G0 Z35

N40 G0 Z150
N41 M30

Hope i can get some help here! 🙂

Re: Siemens 840C post processor

ArjanDijk — Mon, 26 Mar 2018 11:35:10 GMT

Can you upload your model? I don't know why it does two cycles.

Re: Siemens 840C post processor

KristianB95 — Mon, 26 Mar 2018 13:13:11 GMT

That is because it is two diffent hole depths 🙂

Re: Siemens 840C post processor

ArjanDijk — Mon, 26 Mar 2018 21:41:30 GMT

It was a bit of a puzzle, but I found out a few things

You were in bad luck as the Siemens post defines all Cycles in onCycle, where Fanuc defines it in onCyclePoint, the problem is that onCycle does not contain the first cyclepoint in your case, so you don't have the XY coordinates you need to compare with.

What I did is

Copy the complete contents of onCycle to onCyclePoint, place it above the other lines in onCyclePoint
Place the block below on the first line of onCyclePoint

  if (true) {
    var _x=xOutput.getCurrent();
    var _y=yOutput.getCurrent();
    if(x!==_x||y!==_y){ 

    writeBlock(gMotionModal.format(0),xOutput.format(x), yOutput.format(y), "(Sets starting point)");
    }    
    
  }

It works for me, not sure if it works in any case