5 AXIS SWARF CUTTING ON TRUNNION

[Dennis Dielschneider from McCaytool]

Has anybody had any problems making a swarf cut were the tool goes vertical along the cut, then makes a bad move at that point. The B axis (platter on the trunnion) swings 90 + degrees and gouges the part. Part shows good on verify, but not good in g-code.

[Chris Parish]

Dennis:

 

gotta remember one thing ... Backplot / Verify is "pre-processed" g-code...

 

only way for sure of a perfect part is to use vericut / cimco / meta-cut

[bogusmill]

I've had recent experiance with this. A number of things can help with swarf paths. A smaller step size will give closer "oversight" if you will and help keep it from deciding to rotate the wrong way. Turning on point generaters will help some as well though both will increase program size. I was also having problems with small divits at each line of code. The air brake was not even connected to air so I thought the brake was off. However the cut became smooth only after entering the M11 and M13 brake off code.

[Steve Hattori]

What kind of machine? Is the post set for neg tilt only, or tilt both ways? Also, like Bogus says- if you are using the std mcam swarf, use point generator, or if only the transitions around corners are bad try setting a fine stepover in the "fanning" box to make transitions gradual..

[Watcher]

quote:

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only way for sure of a perfect part is to use vericut / cimco / meta-cut

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Hi CParish,

 

Cimco is very helpful but a bit handicapped to simulate multiaxis G-Code. They do good with Heidenhain conversational, but the support for Multiaxis with ISO controls is not reliable enough as Vericut / Meta-cut I guess...

 

JM2C

[gcode]

If your post is a newer X post, make sure

the axis and limit definitons in the machine

def are correct.

I had a 5X post that was outputing some very

dangerous code, spinning 360° in the middle

of a cut and stuff like that.

Setting the angular travel limits in the

machine definiton fixed the problem.

[Guest CNC Apps Guy 1]

quote:

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...only way for sure of a perfect part is to use vericut / cimco / meta-cut /

CAMplete

...

---

There. Fissed.

[Bruce Caulley]

Turn axis lines on in backplot and have a close look in the area you are having trouble with. I have found a few "unexplained" gouges this way.

 

Bruce

[Greg Williams]

Vericut is the answer.

[Superman]

Many a problem.

Graphically on the screen is the required toolpath. In verify the path shows correct.

 

It's the post that adapts the paths to suit the machines limits

We have a 5-axis trunion on the X-axis (with limits from A+20 to A-110. Swarfe paths cannot go past A0, by default the "Inhouse Post" works in the A- area, A+ can be used ( switch is in Misc Intergers).

 

As soon as A0 is crossed, Z rapid retracts, reconfigures the last point into the default area, rapids back to that last contact point and continues swarfing. ( gouge at this point)

 

Another version is a very fast angular move, ( say 90 or 180 deg ) with no actual cutting on the part- just a reposition move with the tool against the part ( another gouge )

 

You can control this by the point generators,step size, or more wiser programming ( break the swarfing into sections-if possible ), (sometimes the fanning, but not always).

 

Can inhouse post be altered to allow the use of the entire axes within the machine's limits ?

[Greg Williams]

quote:

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Can inhouse post be altered to allow the use of the entire axes within the machine's limits ?

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I would think so, Have you asked them?

Is there a misc interger turned on that is locking the trunion to A-?

[Superman]

quote:

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Is there a misc interger turned on that is locking the trunion to A-?

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MI set to 0 = swarfe in A- only

MI set to 1 = swarfe in A+ only

 

Cannot swarfe from A20 to A-90, the post would re-configure the path mid-cut to continue the toolpath, all it needed was to cross the A0 line by sometimes only 1-2 degrees.

 

OK - you have a closed contour with 3 deg outward draft on 3 sides, the last side has 3 deg inward. Now swarfe the walls and not have a major rotation at one point

 

Machine could do it --Mastercam will create a toolpath, but the Post can't, unless it gets broken into 2 ops.

[Greg Williams]

Well ya need to ask the question to this man,

 

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