[Machinekit] Re: new cnc cape

[Lang Gu]

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

在 2018年9月28日星期五 UTC+8上午10:36:55，Lang Gu写道：
>
> 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 
> 
>  OUTPUT 
> (use 74ls244 )
> I use mcp23017 i2c bus  for 16 input(for limit --max/min/home etc.)..
>
> BUT， I'm not a electronic engineer 
> 
> ，so Dare not confirm right。。
> Hope electronic engineer proofreading.
>

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[Machinekit] Re: new cnc cape

[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

On Thursday, September 27, 2018 at 9:36:55 PM UTC-5, Lang Gu wrote:
>
> 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 
> 
>  OUTPUT 
> (use 74ls244 )
> I use mcp23017 i2c bus  for 16 input(for limit --max/min/home etc.)..
>
> BUT， I'm not a electronic engineer 
> 
> ，so Dare not confirm right。。
> Hope electronic engineer proofreading.
>

-- 
website: http://www.machinekit.io blog: http://blog.machinekit.io github: 
https://github.com/machinekit
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[Machinekit] Re: new cnc cape

[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. 

在 2018年9月28日星期五 UTC+8下午10:13:44，Kevin Friesth写道：
>
> 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
>
> On Thursday, September 27, 2018 at 9:36:55 PM UTC-5, Lang Gu wrote:
>>
>> 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 
>> 
>>  OUTPUT 
>> (use 74ls244 )
>> I use mcp23017 i2c bus  for 16 input(for limit --max/min/home etc.)..
>>
>> BUT， I'm not a electronic engineer 
>> 
>> ，so Dare not confirm right。。
>> Hope electronic engineer proofreading.
>>
>

-- 
website: http://www.machinekit.io blog: http://blog.machinekit.io github: 
https://github.com/machinekit
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Re: [Machinekit] Re: new cnc cape

[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

On Fri, Sep 28, 2018 at 9:13 AM Kevin Friesth  wrote:

> 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
>
> On Thursday, September 27, 2018 at 9:36:55 PM UTC-5, Lang Gu wrote:
>>
>> 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
>> 
>>  OUTPUT
>> (use 74ls244 )
>> I use mcp23017 i2c bus  for 16 input(for limit --max/min/home etc.)..
>>
>> BUT， I'm not a electronic engineer
>> 
>> ，so Dare not confirm right。。
>> Hope electronic engineer proofreading.
>>
> --
> website: http://www.machinekit.io blog: http://blog.machinekit.io github:
> https://github.com/machinekit
> ---
> You received this message because you are subscribed to the Google Groups
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> For more options, visit https://groups.google.com/d/optout.
>

-- 
website: http://www.machinekit.io blog: http://blog.machinekit.io github: 
https://github.com/machinekit
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