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Topics - Davemorl

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General Mach Discussion / 4th Axis PID
« on: November 22, 2016, 04:13:06 AM »
Hi all, firstly I'd like to say hello as this is my first post, also thank you for all the help you have provided with me building my DIY cnc router/mill.

I have an idea for a project as we all usually do. I apologise in advance if this has been covered before. I can't find a relevant thread, if there is one I would be great full for a link.

Ok, so my idea which isn't new is to create a 4th axis with a dc motor with a encoder attached via a belt or gear arrangement. Something like this;
http://uk.rs-online.com/web/p/rotary-encoders/9189086/

So my thoughts are if I get a nice big dc motor and have control over position using from my UC300 from mach 3 USB port, this would then output to an arduino or a pic IC custom board with the relevant coding to then give rotation direction and position to the motor using the encoder as a feedback to correct for any errors.

I understand that a stepper is probably the easiest route but as you know a large stepper motor or servo for that matter is very pricey. Also less challenging :)

Can anyone firstly see a flaw in my very embryonic idea firstly and secondly if this has this been done which I'm sure it has does anyone have a link for the c++ code of arduino to save me a lot of headaches and surely weeks of time haha.

I look forward to your replies. Thank you in advance.

Kind regards
Dave

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