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Tool length offsets Fanuc O-M

Thank you! I do have the manuals. I've always found them too "techincal" to follow easily. I seem to lack the necessary patience, until I am forced into a corner.
Besides the Keep Relays, I should also mention the DATA tables. You typically find both in the rear of the Electrical or Ladder Manuals. You'll know you're in the right place as there will be at the top of the page, a K or D followed by a number. The K's will tend to be low numbers whereas the D's will be higher numbers. Like in the 200's let's say. Then there will typically be 8 rows of Function Descriptions. One describing the machine response when the Bit is high (1) and another when the Bit is set low (0).
Note the exact layout will be Manufacturer dependent.

Tread carefully in these waters. If you don't understand completely what you're changing, just leave it alone. Also be sure to record your changes in the manual.
 
Besides the Keep Relays, I should also mention the DATA tables. You typically find both in the rear of the Electrical or Ladder Manuals. You'll know you're in the right place as there will be at the top of the page, a K or D followed by a number. The K's will tend to be low numbers whereas the D's will be higher numbers. Like in the 200's let's say. Then there will typically be 8 rows of Function Descriptions. One describing the machine response when the Bit is high (1) and another when the Bit is set low (0).
Note the exact layout will be Manufacturer dependent.

Tread carefully in these waters. If you don't understand completely what you're changing, just leave it alone. Also be sure to record your changes in the manual.
Got it! Thank you! I learned a long time ago to document everything, before and after! And with cell phones, to take pictures of everything!

As it turns out, my machine position is matching the relative position, exactly, as someone mentioned earlier in this thread that they may or may not. Any idea what conditions they would not be equal? It's such a pleasure to actually see English dimensions after not, for so long.

Therefore, my tool setting issue persists; not reading "true" height above (or into the part) from part zero. I am missing one crucial step, I can feel it, and with some more time, I think I can nail it. As I mentioned, my programs work fine with multiple tools, but it'd be nice to be able to watch the tool approach, physically and on the absolute screen, while debugging a new program.

I appreciate your time!

Mark
 
Hi Folks.

I've been dealing with this ever since I was introduced to Fanuc controls years ago and just dealt with it, but decided that it's time to get the record set straight (in my mind anyhow). I know that it's been discussed in the past but I can't find those threads again.

My O-M is mounted on a mid 90s LeBlond-Makino 4 axis mill.

I set my tools by touching off on top of a 6" block which sits directly on the machine table. I input the relative position in the tool offsets. Then I use a dial indicator to find the difference from the top of the 6" block to the top of my part and input that difference into the G54 Z register.

The machine puts the tool exactly where it needs to be (in Z) but the on screen "position" is never correct.

If I touch off the tool directly on top of my part, input the relative position into the G54 Z register, and zero in the tool length offset, the machine puts the tool where it needs to be (in Z) and the absolute location shows properly on the "position" screen. Obviously, I can only do this with one tool, but would love to be able to get the same result with multiple tools. What am I missing or doing wrong?? Many thanks for looking!

Edited: added some pictures incase someone recognizes an error in my math or methods.

Mark
Depending on your tool.magazine/carasel . An example is say 20 stations for tools . The first 20 are the tool diameter or radius in the data table depending on the machine manufacturer. From 21 to 40 are the tool length . Tool 1 for radius 21 is its length.. Tool 2 is the same length is 22.
Hope this helps.
 








 
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