Turning Reverse G2 and G3

[timdrink01]

I have a lathe that is reversed from most.  Standard spindle direction is M4.  Also it has G2 and G3 reversed, at least from one other lathe. 

The code looks good other than G2/G3.  Using the generic Fanuc turning post.  I can't seem to where I can change them.  Any suggestions?

[Steinwerks]

Are you sure this isn't just the way that the tool is oriented in the turret? M4 is CCW from the point of view of the headstock down the workpiece towards the tailstock. M3 is clockwise.

[timdrink01]

Thanks for the reply.

On this machine, Wasino LJ-106m, M4 is CW looking towards the tailstock. Verified in the OEM manual and other forums.

[LibertyMachine]

And if you mount the tool upside down in the turret, it is on centerline properly?

[timdrink01]

Yes. I've been running parts on this machine for several years. I've already manually programmed and proven the finish profile I'm trying to get Fusion to generate.

[Steinwerks]

Very odd indeed. I would think that the M-code change wouldn't be too difficult but the arc reversal may be trickier. Are you starting with the generic Fanuc post processor?

[timdrink01]

Thanks for the thoughts and questions thus far!  Yes, using the generic Fanuc turning post. In the mean time I've been using find and replace to make the swap. 

Another issue I'm having I need the arcs to be less than 90 deg.  Any suggestions on where to change that? 

[HughesTooling]

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@timdrink01 wrote:

Another issue I'm having I need the arcs to be less than 90 deg.  Any suggestions on where to change that? 

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If you edit the post change this line to 90.

To reverse G02\03 look for all the lines like below and swap all the 2s and 3s so it reads gMotionModal.format(clockwise ? 3 : 2)

.

      writeBlock(conditional(properties.type != "A", gAbsIncModal.format(90)), gPlaneModal.format(17), gMotionModal.format(clockwise ? 2 : 3), iOutput.format(cx - start.x, 0), jOutput.format(cy - start.y, 0), getFeed(feed));

Are you using a PC or mac. After editing the post don't save back to the generic post folder, see standard warning below.

Mark

Do not put custom posts in the generic posts folder. Use the personal folder. or another location.

Fusion 360 CAM Personal Posts Folder Locations

_______________________________________________________________________________

Microsoft Windows:
%appdata%\Autodesk\Fusion 360 CAM\Posts

Mac / Apple / OSX:
/Users/<user id>/Autodesk/Fusion 360 CAM/Posts

[HughesTooling]

@timdrink01 I've come up with an easier way of swapping the G2s and G3s. Add this line at the beginning of the onCircular function.

  clockwise = clockwise ? false : true;

Like this.

Mark

[HughesTooling · Accepted solution]

I just realized the line of code above only reverses G3s, G2s would stay G2.

This will work.

  if(clockwise){
	  clockwise = false;
  }else{
	  clockwise = true;
  }

Mark

[Anonymous]

I had to reverse the arcs on my lathe also.  I just replaced each test of clockwise with a !clockwise so you end up with this:

writeBlock(conditional(properties.type != "A", gAbsIncModal.format(90)), gPlaneModal.format(17), gMotionModal.format(!clockwise ? 2 : 3), xOutput.format(x), yOutput.format(y), zOutput.format(z), iOutput.format(cx - start.x, 0), jOutput.format(cy - start.y, 0), getFeed(feed));

Though I suppose Mark's way is even easier.  But could be reduced to just:

clockwise = !clockwise

Dave

[timdrink01]

Well this is embarrassing. The fabulous group on the gave me a couple of different options to make it work.  Long story short.  This machine does NOT have the G2/G3 reversed, only M3/M4 is reversed.  I was working with the machinist on the floor and well, we just miscommunicated...

It wasn't a total loose though.  Going through the code changes has started to give me a much better insight to the post programing language. Thank you again for every ones input.