TOOL lenght offset on VMC4020

[pilot001]

Hello !

Ive made some investigation...

Shouldt we use G43 H1 for lenght comp ON ? And G49 for turning it OFF ?
Or fadal will use H1 as ON ?

.
.
M6t2
g43 h2
g0 z 2.0
.
.

AKOS

[jdtoolmaker]

DareBee,

Yep, I program all my toolpaths z centre at bottom. 1-16 are my set cutters, 17 is engraving tip, 18 is drill, 19-21 spares.

We currently have a 15xt, but just bought a 4020 w/4th axis 15k spindle.. Can't wait to get it in, end of this week. Never used 4th axis, so a little nervous but very excited!

[pilot001]

Hi !

Finally , i did the tool lenght offset test.

I Did not used G43 for it. With tool 1 i did SETZ so it was zeroed at the iron piece.

But some pics will tell the story...

Yes.. this is in MM so 8.8 offset was not 8,8 "... ca 1/4" that is.

this Gcode was used


Tool table /tool 1 was the "etalon" so it doesnt needed any offsetting/



Tool's offset was displayed during operaton :



Z0 with tool1 /NO offset for tool 1 / /iron block was not under the spidle just before it. /safety first /



Z0 for Tool 2 with offset /8.8 mm/

[pilot001]

Hi !

It is very imprtant that the H command /with number/ is in the SAME line as the M6 T1 is.

IN other case it will cause that fadal doesnt use the offset.

Good : N12 M6 T3 H3

BAD :
N12 M6 T3
N13 H3


Had this issue today got a drill broken.

AKOS

[jdtoolmaker]

pilot,

here is the start of a generated .nc file from mastercam for fadal format 2:

N140 ( MATERIAL - ALUMINUM MM - 2024 )
N150 G21
N160 G0 G17 G40 G80 G90
N170 ( Ø12.0 X R0.5 BULL NOSE [ROUGH] TOOL - 1 DIA. OFF. - 1 LEN. - 1 DIA - 12. )
N180 T1 M6
N190 A-0.
N200 G0 G90 S7500 M3 E1 X92.775 Y-50.938
N210 H1 Z60. M8
N220 Z41.
N230 G1 Z39.25 F100.

hope it helps

cheers

[DareBee]

Doing a SETZ ANYWHERE BUT HOME is DANGEROUS.
Use your tool offsets.
You have to USE an H call AFTER every tool change and BEFORE the next Z move.

Just like above
N180 T1 M6
N190 A-0.
N200 G0 G90 S7500 M3 E1 X92.775 Y-50.938
N210 H1 Z60. M8



H# matches the tool #

[jdtoolmaker]

I hope he takes it in, pictures look dangerous. Is that an offcut he's using that's maybe been machined ?

He's obviously trying to set his tools outside the machine, something I despise in 3d cavity machining. Although, I know alot of people who use that method.

Anyone else set tools outside machine and have no errors or missmatch ?

I can't see how anything other than setting tool heights in machine to bed / job could be more accurate.. ?

Cheers, Shaun.

[pilot001]

HI !

On the pics....

It is a TEST configuration !!

SO in real live work condition :

I select one tool and do a SETZ with it. The rest of the tools will be offsetted relative to the first one.
Probably it is the safest to do it by selecting the longest one to do the SETZ.

AKOS

[DareBee]

NO SETZ NO SETZ NO SETZ NO SETZ NO SETZ NO SETZ

You are changing the home position YOU WILL CRASH YOUR TOOL CHANGER

I am done with this thread - have a nice day

[denmar]

Come on Akos: what is the problem? JUST SET Z0 AT TOOL CHANGE POSITION; JOG YOUR TOOLS ANY WHERE (.100) ABOVE THE PART AND SL,1, DO THE SAME WITH THE REST.
THE PROGRAM:
ASUMMING THE PROGRAM HOME POSTION IS AT TOP LEFT CORNER (X0Y0) LEAVE THE Z ALONE.
H1Z0
G1F30.Z- WHATEVER YOUR DEPTH IS
X,,,,, STARCUTTING.
wANT TO KNOW WHY THE Z AXIS SHOULD BE AT THE CS POSITION?
RIGHT AFTER A TOOL CHANGE, THE HEAD WILL RUSH DOWN TO WHERE YOU SET UP THE OFFSET; WILL NOT GIVE YOU A CHANCE TO STOP IT IF SOMETHING GOES WRONG. (LIKE WRONG TOOL IN THE SPINDLE OR WRONG OFFSET.
CAPISCE?

[pilot001]

Hi !

SETZ at part will not cause the tool changer to crash.

But probably will do some crazy stuff with tools sometimes. Anyway your advice is good. Like XY can be hommed / setx sety /.

Z can be zeroed at any height. like half way or at tool changer heigh.

Like :

setting 1 : jog XY then setx , sety.
setting 2 : jog z high then setz (sorry darebee ) or leave Z at CS point.
setting 3 : joggint toolz to part and using sl 1 sl 2 setc.
Run the Gcode (and pray)

AKOS

[denmar]

Why did you asked for help if you end up doing it your way?