What is the difference between Auto and MDI at the tool change

[cnc_swe]

I have a machine DahLih that when run in MDI always work when I change tools, but in Auto, the machine tool errors at times. Is there a simple explanation to what I will find the error. Sometimes the machine can work all day with no errors. Previous owner mentioned that it might solve himself if you run any macro for tool change. Could it be mechanical or just a setting?

[christinandavid]

Is a macro-program called (on-screen program) when you perform a tool change?

If it is, check there are no macro-variable conflicts, between the tool-change macro-program and your 'main' part-program.

If no macro-program is called at tool change, disregard everything I have just said.

DP

[Bones75]

My understanding from my machine, and many hours of looking around, and trial and error is this. Auto tool change is machine specific command, within the machines ladder logic (IE its brains). So when it is given its specific command for a tool change, it does it, and all you sent is one command.
As for MDI mode, well on my machine, it no longer obeys the original tool change command, which on my machine is basically a sub-program anyway. So, I have to have the commands sent to it, along with the program thru drip feed. So it is told step by step how to do tool change.

Move Z axis to tool change position (in my case home position)
Bring tool changer towards machine
Let go off tool
Move Z-axis up... etc. etc.

Would be a lot easier with one command, rather then 10 or more.
There could be a better explanation, but that is what I have learned on my own, and could be right or wrong on definitions, but that's my machine.

[cnc_swe]

christinandavid:

The prefore owner said that a macro might solve my problem but he could not Fanuc macro without reference to any support.

Bones75:

If is machine specific command what could go wrong in the command. When I think of possible errors, I think it ought to be the wrong time on a loop or something from toolchanger reproducing the wrong answer.
The machine changes tools but it is wrong sometimes.
My thought is just a guess.
I see it only from a mechanical standpoint.
Does anyone know what command or macro is and how it is structured.
How do toolchanger that it is the right number when switching.
Is ATC zero at startup, and so on.

Are you on my mind?

[christinandavid]

If MDI tool calls ALWAYS work correctly, there must be an issue in your programming format. Give us a program example, for example, do you ready next tool with T command prior to toolchange?

DP

[cnc_swe]

Sorry about the delay. I can help out as a carpenter during the day, so everything mechanically is unfortunately fallow.

My machine is sectioned into a terminal during the time I expand my workshop. I have not done anything in the Fanuc system, but only in the SINUMERIK 810 M / T.
So my questions are more theoretical and from what I saw when I bought the machine.
I hope to install it within 4 weeks and then go into more detail when I have the system up and running.
But let the discussion continue.

[txcncman]

My first guess is that you have an intermittent mechanical problem. A good machine mechanic can diagnose this for you and repair it.

[cnc_swe]

Thanks for the reply txcncman, you may well be right. I am completely ignorant of the macro programming but I've been thinking about it as you
say may be a mechanical failure. There were no other errors that the seller said, and I was surprised that did not know the cause of which was child's play.

But he was perhaps more producer than a mechanic.
When the machine is in place, I get by measuring carefully and try to understand what is happening.
Although time functions as relays can probably create these errors. I will look for an operating Chema for ATC.
Maybe some friendly grounds here on the forum owns one