HASS VF4 rapid movement

[phodee6]

Does anyone know how to fix the rapid movement in HASS VF4 and VF2 when machining with 3d toolpaths or even 2d toolpaths. The x and y travel do not meet at the same time when moving like shown in the backplot in Mastercam, this is a huge problem becasue the tool will cut into areas where the tool should not go.

[Rocketmachinist]

Search for your answer, it helps. Linky

[phodee6]

Thanks for that link, no fixes for this dogleg rapid movement, Thanks Haas for the $400 block! rubbish machines

[Machineguy]

The HAAS is not the problem! 95% of all the machines do a dogleg in rapid mode. THATS STANDARD.

Check your output from your post.Z will move first to a CLEARANCE plane you set. Then x, y.

Look at a side view of the verify screen. How high are you rapid Z moves? If they dont clear the part you are going to hit something, more then likely.

Dont blame the machine for doing what it supposed to do. Move as fast as it can to the next feed move.

Dog leg is normal. It has bit a lot of us, OK!

When you understand this you will be a better programmer for it.

 

This can really get you when your rapid moves are different from "PATH TO PATH" using the same tool. A 3d model of you part will show this really quick in verify.

 

Hang in there, were here to help.

[Pilot Plant Supervisor]

I always use full vertical retract. I usually only get one chance, so time is not as important as knowing the tool will clear.

[phodee6]

i hear you, either way this dogleg situation should not be there, when looking at the rapid lines in the back plot and verifying the tool path there are no indication of this collision. I was doing a large nest using surface high speed (core roughing) tool path, I had the clearance plane set at absolute 2.000, part clearance 1.000 and the linear entry and exit at .500. I thought this would be plenty for a 2inch deep cavity, anyways live and learn, this is my first large 3d nest project for a haas machine and using the latest mastercam version, most of my 3d programing experience has been with the old mastercam series starting from mastecam3 - mastercam9 (10years) and the only thing you had to worry about was the tool plunging through the surface

[Machineguy]

I'm using a 2010 VM-3. Its different then the VF-3. Its loaded with all the options. The resolution is much tighter then the VF version.

It doglegs also. You learn to adapt to what the machines can do an program within that framework. When doing 4-axis work on a vertical or horz, Crearance planes must be set correctly.One miss caculation can ruin your whole day.

Your example of 2.00 in absolute. Where is your ZO ? Some toolpaths work different in the clearance planes. They may stay low

when you expect them to go high to the next area.Just dont assume anything. Always look at a side view to see what the path is doing, and always clear enough for dog leg motion.

Next read the code for that path. Look for "Z" moves. It can save you a lot.

 

Machineguy

[phodee6]

i have the z zero set on top of stock and i always look at all angle before sending anything out but you are right you can't assume anything, its the mother of all f*&k ups.

[MrFish]

This is a Mastercam verify/backplot issue. You can set your control def so that the verify should verify with a dog leg to show these crashes but it has a bug so does not work. I have sent this to QC many versions ago but still hasn't been fixed !!

 

 

My link

[Redfire427]

The simple fix for this is to uncheck the "rapid" and use a high feedfate which will produce a linear move rather than a dogleg. On our junk Haas mills, I use 300 ipm for the "rapid" feedrate. This way, whatever you see in backplot/verify, is what you will get at the machine with no surprises.

 

Carmen

[Pilot Plant Supervisor]

I have used the 300 IPM feed instead of rapid, but I almost got bit because I didn't draw my clamps in. The tool started heading for the clamp and I hit feed hold, but at 300 IPM, the machine had to decelerate and it almost didn't stop in time. I decided to spare my shorts and just use full vertical retract.