tool length

[vvv_contractor]

Hello there,

 

i am a mechanical designer and software developer.

i am learning to use mastercam and g-code so i can write program to understander g-code.

 

my question for today is: if i see g49 in my nc file is that means it will not compensate tool lengths?

i am trying to machine a part and have 4 tools with different length and each time i am running it, it seams to me like it only recognize one length, causing the machine to dig into workpiece and sometime it not cutting.

[mayday]

G49 cancels all tool lenght offsets

each new tool needs a g43 h# to register the new tool lenght

 

example

TOOL#1

G0G90G54X0Y0S800M3

G43Z1.H1M8

ECT.

 

TOOL#2

G0G90G54X0Y0S800M3

G43Z1.H2M8

ECT.

[vvv_contractor]

hi mayday,

thank you for prompt respond.

 

are you saying that each time a system prompt me to change tool, i have to register the length and z height of my cnc machine?

 

here is my nc file i have programed it using "from tool" in tool offset registers option.

 

%

O0000

(PROGRAM NAME - CASE_BLADE)

(DATE=DD-MM-YY - 03-09-03 TIME=HH:MM - 10:20)

N100G20

N102G0G17G40G49G80G90

( 3/16 FLAT ENDMILL TOOL - 2 DIA. OFF. - 0 LEN. - 0 DIA. - .1875)

N104T2M6

N106G0G90X0.Y0.A0.S2900M3

N108G43H0Z.5

N110X-.2712Y-.3024

N112Z.25

N114Z.1

N116G1Z-.008F6.16

N118X.2712F6.26

N120Y-.1814

N122X-.2712

N124Y-.0605

N126X.2712

N128Y.0605

N130X-.2712

N132Y.1814

N134X.2712

N136Y.3024

N138X-.2712

N140G0Z.242

N142X-.2813Y.3125

N144Z.1

N146G1Z-.008F6.16

N148Y-.3125F6.26

N150X.2813

N152Y.3125

N154X-.2813

N156G0Z5.

N158X0.Y0.

N160Z0.

N162Z.5

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N930G0Z5.

N932Z.5

N934M5

N936G91G28Z0.

N938G28X0.Y0.A0.

N940M01

( 1/8 FLAT ENDMILL TOOL - 1 DIA. OFF. - 0 LEN. - 0 DIA. - .125)

N942T1M6

N944G0G90X0.Y0.A0.S2900M3

N946G43H0Z.5

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%

[mayday]

if you notice at your tool change (m6)

you have an H0 after G43, the machine is not comping for tool lenght. it needs a value i.e. G43H1 ect.

you have to measure your tools first and enter there lenghts in the tool ofset page.idealy matching tool# with offset#. less confusing. at tool change call the H value of that tool with the G43

[robk]

+1 May^day

 

good explanation

 

quote:

---

are you saying that each time a system prompt me to change tool, i have to register the length and z height of my cnc machine?

---

Yes... Your H# is your TLO#. Put in the length of the tool into your corresponding offset #. That way the machine knows where the tool is in relation to where the part is.

 

Rob

[chris m]

Edit/ These guys out typed me so I'm late chiming in, but I'll leave it here anyway /Edit

 

 

What he's saying is that you should have four tool length offsets in your CNC control that are set by touching the tool off and using the "measure" or "calculate" feature to let the machine know where it needs to position the Z axis in order to have the tool tip touch the part. The tool length offsets typically have the same # as the tool #; H1 for T1, H2 for T2, etc. As you can see in your (long) posted code the G43 word is calling H0 every time you get a tool change, therefore the machine will not read the tool length offsets in the machine (if they are there)

 

You should have a G43 H1 for T1, G43 H2 for T2 in order to properly machine a part.

 

C

 

[ 09-03-2003, 11:01 AM: Message edited by: chris m ]

[vvv_contractor]

where do i enter the tool offset length in mastercam v9?

 

but i have already entered the all the values from "define tool" dialogbox.

 

thanks

[robk]

When you create a new tool..In the tool paramaters page. It asks for length offset #.

 

Rob

[mayday]

first tab in the opp

tool#

dia. offset

len. offset

 

 

Hey, welcome to the forum

 

[ 09-03-2003, 11:10 AM: Message edited by: May^Day ]

[chris m]

Just remember that you can have the code perfect and still whack the machine if the values in the CNC aren't there...

 

C

[Brendan P]

quote:

---

Just remember that you can have the code perfect and still whack the machine if the values in the CNC aren't there...

---

Haaaaa...

Speaking from first hand experience I presume?

[Guest CNC Apps Guy 1]

That H0 is what's killing you. As was stated earlier, you need to have your "H" number match you "T" number.

 

James teh "Day late and a dollar short..."

[crazy^millman]

Also check your job set-up and make sure it is not adding tool dia and lengths with a vaule of 0. I always turn that to from tool. That also could be given you a fit. You would also want to change that in your config but we can get into that later.

 

Crazy Millman

 

[ 09-04-2003, 01:22 AM: Message edited by: Millman^crazy ]

[heeler]

One thing to remember, This is for fanuc controls. I'm sure that some others use the H word as well for tool length. We have a Vickers 2100 that applies tool length with the tool change/call. Same for our routers with a xxxxor control. The H word on the Vickers is for the work piece offset (like a G54 ect).

 

HTH

Glenn-

[chris m]

quote:

---

This is for fanuc controls

---

Fanuc, Yasnac, Haas, Okuma are all like this (at least the ones I've seen)

 

No experience with some of the other, less 'common' controls

 

C

[Rick Damiani]

quote:

---

where do i enter the tool offset length in mastercam v9?

---

Maybe it's just my suspicous nature, or maybe I have too much experence with engineers trying to write thier own G-code, but I'm wondering if there isn't a communicaiton problem here. i.e. vvv is asking one thing and we are answering something else entirely.

 

vvv_contractor: are you looking for a place to input a tool length value you measure in the machine, or are you looking for a way to call that value up in your program? The advice posted so far is all about the latter. For us to help with the former, we'll need to know what machine you are trying to run.

[kccadcam]

quote:

---

The H word on the Vickers is for the work piece offset (like a G54 ect).

---

H is for height offset!! Why would Vickers do somthing like this?? Just to see some awsome crashes for us old Fanuc/Yasnac boys??

[chris m]

Actually, Kevin, in my Okuma VMCs H is for both TLO and Work Offsets

 

G56 H1 is TLO for T01

G15 H1 is Work Offset 1

 

I want to know what idiot devised that scheme

 

Took a little getting used to; especially for the operator who is running a Matsuura with a Yasnac control and one of the Okumas at the same time...

 

C

[tryon]

[ 09-07-2003, 01:23 AM: Message edited by: try-on ]

[Jack Mitchell]

Only to clarify vvv_contractor's question:

 

As a programmer we do not concern ourselves with differing tool lengths - we treat all tools as the same length otherwise things can really get out of hand.

 

As the operator, we simply view the tool call within the program and go about setting workpiece zero and measuring our tool lengths and diameters as required.

 

So somebody gives me the operator a drawing and a program to run: Setup vise, mount workpiece, preselect tools and holders, mount tools into magazine.

 

As the operator I always select the longest tool to establish "Z" zero that way all the other shorter tools will have a negative sign attached to them as opposed to both negatives and positives.

 

Tool 1 = 12.5"

Tool 2 = 3.2"

Tool 3 = 5.5"

Tool 4 = 8.0"

 

Since Tool 1 is longest then we touch off and set G54 Z to -12.5

We also make sure that this particular tool has "0" zero set in the offset screen on the machine tool only because we established part zero with this tool.

 

G43 H01 X0 Y0 Z2.0 S1000 M03 - longest tool with zero offset definitely stops 2" above part.

 

H01 = 0

H02 = 12.5-3.2 H02 = -9.3

H03 = 12.5-5.5 H03 = -7.0

H04 = 12.5-8.0 H03 = -5.5

 

G43 H02 X0 Y0 Z2.0 S1000 M03 – second tool with offset definitely stops 2” above part.

 

G43 means add tool length

G44 means subtract tool length

G49 cancels all active tool lengths

 

When using MasterCam we can set graphical tool lengths – but this is only visual practice. The real offsets are realized by correct programming and proper setup performed by the operator.

 

I don’t intend to make this simplistic or draw conclusions. It just dawned on me that perhaps you were not aware of the differences.

 

 

Regards, Jack