[Machinekit] new cnc cape

[Lang Gu]

Hello, everyone .
I'm new drawing a cnc cape sch..
It‘s with 19 Optocoupler isolation INPUT(11 INPUT use for MPG ,) and 16
Non-Isolated
<http://www.baidu.com/link?url=BNsib2kq5dU8yQ3jhUW_wDiqwNZxNq5P7JzjPDx1rfcoNPFdszJvZ8zLIqiWuH-7Woivxv5a-paqfa5Ui_Y1sK5dGrImqKKsL1UuBvKD_I_> OUTPUT
(use 74ls244 )
I use mcp23017 i2c bus for 16 input(for limit --max/min/home etc.)..

BUT I'm not a electronic engineer
<http://www.baidu.com/link?url=saoUwpWVqX9fqxwvTEnna5vS05zf8DhiAKldVez8q5GHfCz1Szl3t9cDThxi9fsGefvPnwieq1CNXvScUhbFfzhG9rRPyDiZA9OtahQhDDybCFnRhdzZVUGuv986kLeU>
so Dare not confirm right。。
Hope electronic engineer proofreading.

[Lang Gu]

Can your help me?
If no error,i will make pcb & open scouce。

圚 2018幎9月28日星期五 UTC+8䞊午10:36:55Lang Gu写道

Post by Lang Gu
Hello, everyone .
I'm new drawing a cnc cape sch..
It‘s with 19 Optocoupler isolation INPUT(11 INPUT use for MPG ,) and 16
Non-Isolated
<http://www.baidu.com/link?url=BNsib2kq5dU8yQ3jhUW_wDiqwNZxNq5P7JzjPDx1rfcoNPFdszJvZ8zLIqiWuH-7Woivxv5a-paqfa5Ui_Y1sK5dGrImqKKsL1UuBvKD_I_> OUTPUT
(use 74ls244 )
I use mcp23017 i2c bus for 16 input(for limit --max/min/home etc.)..
BUT I'm not a electronic engineer
<http://www.baidu.com/link?url=saoUwpWVqX9fqxwvTEnna5vS05zf8DhiAKldVez8q5GHfCz1Szl3t9cDThxi9fsGefvPnwieq1CNXvScUhbFfzhG9rRPyDiZA9OtahQhDDybCFnRhdzZVUGuv986kLeU>
so Dare not confirm right。。
Hope electronic engineer proofreading.

[Kevin Friesth]

Hello,

One potential issue I see with your circuit design is that it doesn't seem
to have io inputs to allow use of encoders on all axis's which would
greatly enhance accuracy and repeatability for movements and actions.
Homing works for startup and such but it doesn't track potential movement
and positioning errors.
ie http://www.anaheimautomation.com/manuals/forms/encoder-guide.php#sthash.U7z4xbhg.dpbs

Regards,

Kevin

Post by Lang Gu
Hello, everyone .
I'm new drawing a cnc cape sch..
It‘s with 19 Optocoupler isolation INPUT(11 INPUT use for MPG ,) and 16
Non-Isolated
<http://www.baidu.com/link?url=BNsib2kq5dU8yQ3jhUW_wDiqwNZxNq5P7JzjPDx1rfcoNPFdszJvZ8zLIqiWuH-7Woivxv5a-paqfa5Ui_Y1sK5dGrImqKKsL1UuBvKD_I_> OUTPUT
(use 74ls244 )
I use mcp23017 i2c bus for 16 input(for limit --max/min/home etc.)..
BUT I'm not a electronic engineer
<http://www.baidu.com/link?url=saoUwpWVqX9fqxwvTEnna5vS05zf8DhiAKldVez8q5GHfCz1Szl3t9cDThxi9fsGefvPnwieq1CNXvScUhbFfzhG9rRPyDiZA9OtahQhDDybCFnRhdzZVUGuv986kLeU>
so Dare not confirm right。。
Hope electronic engineer proofreading.

[Kevin Friesth]

check out
https://www.nxp.com/products/analog/interfaces/ic-bus/ic-bus-controller-and-bridge-ics/fm-plus-i2c-bus-stepper-motor-controller:PCA9629PW

Post by Lang Gu
Hello,
One potential issue I see with your circuit design is that it doesn't seem
to have io inputs to allow use of encoders on all axis's which would
greatly enhance accuracy and repeatability for movements and actions.
Homing works for startup and such but it doesn't track potential movement
and positioning errors. ie
http://www.anaheimautomation.com/manuals/forms/encoder-guide.php#sthash.U7z4xbhg.dpbs
Regards,
Kevin

Post by Lang Gu
Hello, everyone .
I'm new drawing a cnc cape sch..
It‘s with 19 Optocoupler isolation INPUT(11 INPUT use for MPG ,) and 16
Non-Isolated
<http://www.baidu.com/link?url=BNsib2kq5dU8yQ3jhUW_wDiqwNZxNq5P7JzjPDx1rfcoNPFdszJvZ8zLIqiWuH-7Woivxv5a-paqfa5Ui_Y1sK5dGrImqKKsL1UuBvKD_I_> OUTPUT
(use 74ls244 )
I use mcp23017 i2c bus for 16 input(for limit --max/min/home etc.)..
BUT I'm not a electronic engineer
<http://www.baidu.com/link?url=saoUwpWVqX9fqxwvTEnna5vS05zf8DhiAKldVez8q5GHfCz1Szl3t9cDThxi9fsGefvPnwieq1CNXvScUhbFfzhG9rRPyDiZA9OtahQhDDybCFnRhdzZVUGuv986kLeU>
so Dare not confirm right。。
Hope electronic engineer proofreading.

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[Lang Gu]

Hi,kevin,
closed loop or semi-closed loop is hard for me.
So I chose the easy way---use open loop.
Thanks for your advice,this is very helpful for my future.

圚 2018幎9月28日星期五 UTC+8䞋午10:13:44Kevin Friesth写道

Post by Lang Gu
Hello,
One potential issue I see with your circuit design is that it doesn't seem
to have io inputs to allow use of encoders on all axis's which would
greatly enhance accuracy and repeatability for movements and actions.
Homing works for startup and such but it doesn't track potential movement
and positioning errors. ie
http://www.anaheimautomation.com/manuals/forms/encoder-guide.php#sthash.U7z4xbhg.dpbs
Regards,
Kevin

Post by Lang Gu
Hello, everyone .
I'm new drawing a cnc cape sch..
It‘s with 19 Optocoupler isolation INPUT(11 INPUT use for MPG ,) and 16
Non-Isolated
<http://www.baidu.com/link?url=BNsib2kq5dU8yQ3jhUW_wDiqwNZxNq5P7JzjPDx1rfcoNPFdszJvZ8zLIqiWuH-7Woivxv5a-paqfa5Ui_Y1sK5dGrImqKKsL1UuBvKD_I_> OUTPUT
(use 74ls244 )
I use mcp23017 i2c bus for 16 input(for limit --max/min/home etc.)..
BUT I'm not a electronic engineer
<http://www.baidu.com/link?url=saoUwpWVqX9fqxwvTEnna5vS05zf8DhiAKldVez8q5GHfCz1Szl3t9cDThxi9fsGefvPnwieq1CNXvScUhbFfzhG9rRPyDiZA9OtahQhDDybCFnRhdzZVUGuv986kLeU>
so Dare not confirm right。。
Hope electronic engineer proofreading.