tool changer component integreted on a axis
08 Dec 2013 02:24 #41399
by andypugh
index-enable is a bidirectional pin. The encoder counter module sets it low to indicate that an index has been seen and that the encoder has been zeroed.
Replied by andypugh on topic tool changer component integreted on a axis
one thing that I don't understand in you example, its that you set " index_enable = 1" and in case1 you will see if "!index_enable", so it should never happens.
index-enable is a bidirectional pin. The encoder counter module sets it low to indicate that an index has been seen and that the encoder has been zeroed.
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08 Dec 2013 02:32 #41400
by jtc
Replied by jtc on topic tool changer component integreted on a axis
now makes sense.
Thanks!
Thanks!
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10 Dec 2013 05:31 #41445
by emcPT
Replied by emcPT on topic tool changer component integreted on a axis
We are quite close to obtain a solution using only a component.
Hard to debug the code during the component programming but it appears to be near stable.
One thing that, despite all day working on this, we did not achieved is the ability to set the current position to zero in the A axis right after the homing sequence ends (in a similar way like an ordinary axis does) - after homing the DRO is set to 0.
What we are doing now (after the home) is to read what ever value the current position is and sum a value so that the commanded position equals the desired position.
It seams to be working, but for debug proposes and to be more readable it would be much better to see 30.000, 60.000 (30 and 60 degrees) than 43.23434, 63.23232 in one linuxcnc run, and different values on another run.
The problem is that the initial position is never the same as the toolchanger can rotate more or less until homed (depends on the toolchanger position when linuxcnc starts).
Hard to debug the code during the component programming but it appears to be near stable.
One thing that, despite all day working on this, we did not achieved is the ability to set the current position to zero in the A axis right after the homing sequence ends (in a similar way like an ordinary axis does) - after homing the DRO is set to 0.
What we are doing now (after the home) is to read what ever value the current position is and sum a value so that the commanded position equals the desired position.
It seams to be working, but for debug proposes and to be more readable it would be much better to see 30.000, 60.000 (30 and 60 degrees) than 43.23434, 63.23232 in one linuxcnc run, and different values on another run.
The problem is that the initial position is never the same as the toolchanger can rotate more or less until homed (depends on the toolchanger position when linuxcnc starts).
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10 Dec 2013 05:44 #41446
by andypugh
Replied by andypugh on topic tool changer component integreted on a axis
You should be able to do this by zeroing the encoder, either with .index-enable or with .reset.One thing that, despite all day working on this, we did not achieved is the ability to set the current position to zero in the A axis right after the homing sequence ends .
The following user(s) said Thank You: emcPT
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10 Dec 2013 05:56 #41450
by emcPT
Replied by emcPT on topic tool changer component integreted on a axis
On the morning we will post the results.
Thank you again.
Thank you again.
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11 Dec 2013 06:50 #41492
by emcPT
Replied by emcPT on topic tool changer component integreted on a axis
Just to inform that the .reset did what was expected.
We still have a small issue but we will probably manage it.
We still have a small issue but we will probably manage it.
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12 Dec 2013 03:01 #41523
by emcPT
Replied by emcPT on topic tool changer component integreted on a axis
With the help posted in this thread and the example of the Boxford lathe we were able to create the toolchanger! 
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