Siemens 840d post "allow helical moves "

[Anonymous]

It seems the "allow helical moves " option doesn't work with Siemens 840d post, but it works with other posts, like Funac , Haas ,  even 802d post.

[Anonymous]

Fanuc G-code:

N25 T3 M6

N30 S2865 M3

N35 G54 N40 M8

N45 G0 X81.465 Y109.532

N50 G43 Z15. H3

N55 G0 Z2.55

N60 G3 X77.334 Y99.938 Z2.117 I1.035 J-6.133 F350.

N65 X87.772 Y100.11 Z1.684 I5.164 J3.46

N70 X83.331 Y109.552 Z1.251 I-5.272 J3.285

.............

[Anonymous]

840d G-code:

N18 T3 D1
N19 M6
N20 CYCLE832(0.1, 112001)
N21 S2865 M3
N22 G54
N23 G0 X81.465 Y109.532
N24 G0 Z15
N25 M8
N26 R1=802.1 ; Cutting
N27 R4=350 ; Entry
N28 R5=350 ; Exit
N29 R6=8000 ; Direct
N30 R8=350 ; Ramping
N31 G0 Z2.55
N32 G17
N33 G1 X81.156 Y109.472 Z2.539 F=R8
N34 G1 X80.85 Y109.396 Z2.528
N35 G1 X80.549 Y109.305 Z2.517
N36 G1 X80.252 Y109.198 Z2.506

.................

[Anonymous]

These are 840d g-code

[Anonymous]

I have same problems with Siemens 840d post.

Semi-working solution is to enable ArcTurn. This will enable IJK mode which outputs helical moves. BUT there is HUGE problem with this method. Lead-in and lead-out moves might give incorrect coordinates or arcs could be too small for Siemens Sinumerik controller. This will result in alarm on controller and machine will stop. So you have to disable small lead-in and lead-outs. 

Suggestions for post-processor update:

-use IJK for adaptive / bore operations

-use radius mode for lead-in, lead-out and 2d contoure operations

[Laurens-3DTechDraw]

Yeah can't do helical moves with radiusmode.

So need to enable arcturn.

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@Anonymous wrote:

I have same problems with Siemens 840d post.

Semi-working solution is to enable ArcTurn. This will enable IJK mode which outputs helical moves. BUT there is HUGE problem with this method. Lead-in and lead-out moves might give incorrect coordinates or arcs could be too small for Siemens Sinumerik controller. This will result in alarm on controller and machine will stop. So you have to disable small lead-in and lead-outs. 

Suggestions for post-processor update:

-use IJK for adaptive / bore operations

-use radius mode for lead-in, lead-out and 2d contoure operations

---

There is a tolerance parameter in the machine how much the points are allowed to deviate.

The thing is with IJK the machine will error, with radiusmode it will execute but cut the wrong path(As the same error is present in the code). So I rather have IJK.

It's this parameter for the 840D I believe: