jumpy multiaxis toolpath

[joshd]

hey guys,

first post here and i'm hoping you can help me out. i'm new to 5axis programming and so far i've been able to eventually figure out a solution to my problems until now. i have a 2011 haas vm2 with a tr160 and the part i'm trying to machine is basicly a large hollow box. i want to use a shorter length ball mill in an extended holder and surface the inside rather than a 5inch .375 endmill to get way down inside the part. after quite a bit of messing around i ended up with a toolpath that looks good in verify/machine simulation but when i post to the machine it jerks all over the place. it seems to travel the right path just not in a smooth motion. i'm trying to narrow down where my problem lies (cam/machine settings). heres a small portion of the code i'm getting, maybe you guys can point me in the right direction. thanks in advance!

 

 

 

 

 

 

O0001(BOX 5AX)

(DATE=DD-MM-YY - 02-12-11 TIME=HH:MM - 11:12)

(MATERIAL - ALUMINUM INCH - 6061)

(T15|8MM 2 FLUTE BALL |H15)

G20

G0 G17 G40 G49 G80 G90

G0 G28 G91 Z0.

(8MM 2 FLUTE BALL |TOOL - 15|DIA. OFF. - 15|LEN. - 15|TOOL DIA. - .314961)

M11

M13

T15 M6

G0 G54 G90 X3.3629 Y-7.346 B7.325 A34.996 S10000 M3

G43 H15 Z2.1813 M8

Z3.062

Y-7.9625

Z2.662

G1 Z2.262 F35.

X3.3636 Y-7.9755 F55.

X3.3663 Y-7.9916

X3.371 Y-8.0072

X3.3776 Y-8.0221

X3.3859 Y-8.0361 Z2.2621

X3.3959 Y-8.049 Z2.2622

X3.4073 Y-8.0606

X3.4202 Y-8.0707 Z2.2623

X3.4341 Y-8.0791 Z2.2624

X3.449 Y-8.0858 Z2.2625

X3.4645 Y-8.0905 Z2.2626

X3.4806 Y-8.0934

X3.4969 Y-8.0945 Z2.2627

G93 X3.4565 Y-8.1167 Z2.2474 B7.773 A34.995 F999.99

X2.9728 Y-8.356 Z2.0797 B12.976 A34.996 F999.99

X2.954 Y-8.3644 Z2.0737 B13.172 A34.997 F999.99

X2.4239 Y-8.5727 Z1.9279 B18.585 F999.99

X2.3775 Y-8.5885 Z1.9171 B19.048 A34.995 F999.99

X1.855 Y-8.7433 Z1.8089 B24.163 A34.993 F999.99

X1.8136 Y-8.7538 Z1.8015 B24.562 A34.994 F999.99

X1.2667 Y-8.8684 Z1.7208 B29.76 A34.997 F999.99

X1.2279 Y-8.875 Z1.7158 B30.124 A35. F999.99

X.6498 Y-8.9472 Z1.6659 B35.509 A34.995 F999.99

X.6208 Y-8.9496 Z1.6643 B35.777 F999.99

X.0572 Y-8.9748 Z1.6464 B40.973 A34.996 F999.99

X.0161 Y-8.9751 Z1.6459 B41.352 A34.998 F999.99

X-.5766 Y-8.9532 Z1.6616 B46.814 A34.996 F999.99

X-.6033 Y-8.951 Z1.6633 B47.061 A34.995 F999.99

X-1.157 Y-8.8862 Z1.7087 B52.211 F999.99

X-1.2134 Y-8.8772 Z1.7149 B52.74 F999.99

[K2csq7]

Welcome Josh, If you can get a file up on the FTP (5th topic down from the top) you will get much better responses

[dforsythe]

unlock the brake for A and B

 

 

[joshd]

i added the file to the ftp site called "5ax box". it's tool path 33 that i'm working on. some things like the step over are adjusted high just for verify speed.

[EX-wccprogrammer]

Insert 'G94' after the 'G43' line. This disables exact-stop mode on Haas machines. Then it will run smoother.

[joshd]

G94 didn't make a difference and i double checked to make sure a and b are unlocked and they are.

[EX-wccprogrammer]

The problem with Haas 5-Axis is that they don't make one. The B-Axis is always a 'bolt-on' or they have a dual rotary trunnion. The problem that kills simultaneous motion is the lack of synchronized motion between the bolt-on and the machine. Call Haas out and have them correct the inverse-time parameters for your rotary setup.

 

HTH

[Colin Gilchrist]

Josh,

 

I'd recommend calling Haas and having them check the parameter settings in the control for the Trunion. They can usually make the synchronization between the rotary axes much better.

 

On the Mastercam side, I'd also recommend checking your max and min feedrate settings for inverse time.

 

You are outputting G93 and getting the same feed value (F999.) on every line. Do a search here on the forum for "inverse time". This subject has been covered many times with very good explanations. In a nutshell though: the feed value on each line represents the amount of time it takes to complete the move.

 

Getting the same feed output on every line tells me you are hitting a limit.

[Teh Bear without Brains kinda idiot]

unlock the brake for A and B

~~~~~~~~~~~~~~~~~~~~~~

+1

We run two Haases with tr210 and tr160

put codes M11 and M13 before the actual movement not before the toolchange

M6 is macroprogram and ours brakes the axes A and B

 

HTH

[K2csq7]

before the actual movement not before the toolchange

[jfich]

I saved a file on the FTP site called 5AX BOXJ. I have always had good luck with 5axis flow toolpath doing stuff like that.

[Teh Bear without Brains kinda idiot]

joshd

No need to see your file

I see your code and thats enough

On my machine you will have "jerking"

I explained why in previous reply

exactly in the places where you have only one axial movement like here

X-.6033 Y-8.951 Z1.6633 B47.061 A34.995 F999.99

X-1.157 Y-8.8862 Z1.7087 B52.211 F999.99 (AXIS A IS CLOSED HERE )

X-1.2134 Y-8.8772 Z1.7149 B52.74 F999.99 (STILL CLOSED)

You not move your A axis so it will be closed automatically cause M11 is not active

Next time when you`ll have A movement it will be opened and it takes time so comes the "jerk"

if in every block there would be A and B movement axis will be opened

When one axis is not moving it will be closed

I run 5X Haases with trunion for 5 years and I know what I say.

tEST MY THEORY

 

br

HTH

[joshd]

Hey guys just wanted to thank you for the help. I tried a bunch of different approaches before going back to the original 'jumpy' toolpath and now I think it will work ok. Funny how taking a couple days off of a project can clear your mind and get you re engaged!