pnp for a CD loader,

[David Haigh]

Looking at building this a long standing project has anyone actually used this software for anything like this?

Thanks.

David

[Arthur Wolf]

Hello David.

Do you mean using a PNP to grab CDs from stacks and loading them into CD readers or writers?

That's a pretty straightforward CNC application that you should be able to set up with pretty much any CNC control system (wouldn't even have to be pick-and-place specific as a lot of the "electronics components" pick and place features I expect you wouldn't really need.

Do you have a more detailed description of the machine you intend to make? I think that'd help with everybody here being better able to advise you.

PS: If you ever get stuck with designing or building your machine: wolf....@gmail.com.

Cheers.

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勇気とユーモア

[David Haigh]

Hi Arthur, Exactly that, have 6 drives in a tower, and I'm currently setting up  "Automatic-Ripping-Machine" ARM to do the copying. It will be running in a VM on a W11 PC. But then I thought what about some form of robot to load and unload the discs. So, early days yet as I have the follow little experience Linux, FreeCAD, python! It's going to be one hell of a learning curve. Which is another reason why I want to do it. 

So looking into the robot side of things I came across OpenPNP, and with it's already setup resources wondered if it was adaptable? As I will need a Z of at least 40cm. Looking at 3d printers there seem to be loads of ways to make a core xyz frame, so no issues there apart from the cost of the electronic side of things. But I haven't settled on a control software package I would like to utilize. That's were the question comes in!

Thanks for the reply

David.

[Arthur Wolf]

So first off, I don't think you need 3 axes.

You can easily do this with two axes.

You got 3 "positions": input CD pile, CD reader(s), output CD pile.

That's something you should be able to manage easily with a 2 axis setup (horizontal+vertical).

Plus a relay/SSR for a simple vacuum control setup.

I'm not sure if I'd go with a corexy system, it's more difficult to get right than a straightforward axis-on-axis setup if you're a beginner (you have to be very serious about tightening and tolerances and wrapping etc), and I'm not sure if you actually need the extra speed/light weight.

If you really need speed here, a great option would be a flattened/2D version of the linear delta architecture (or if you really need 3D movement, an actual/non-flattened linear delta structure). The 2D version of linear delta is much simpler to get right, it's just two linear axes, a few ball bearings and 4 long "plates".

I wouldn't worry too much about the learning curve, nowadays, there is a ton of great documentation online, and you can use chatgpt for guidance/advice, and there are great communities like this one too.

For control software/firmware/hardware, I'm the guy that created the smoothieware project so probably won't get very objective/un-biased advice from me about that, but what you'll get is help if you ever need it.

In general, I think if you just go with a simple gcode-based control board (like openpnp uses), and a simple xy setup, it should be fairly straightforward to get something going that works well.

To view this discussion visit https://groups.google.com/d/msgid/openpnp/03a9139d-7eab-4724-bfe2-a3605ae37aacn%40googlegroups.com.

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勇気とユーモア

[David Haigh]

HI Arthur,

Thanks for that, still in the early stages as I say. Only small caveat is it's final location! This will be an Ikea Ivor shelf 80 x 30 cm, height being adjustable. Don't need anything high speed as It will be waiting on the drives to eject. Will need some form of gate in the program to stop disc popping out when the pic up arm is in the way but other than that I don't see any issues.

As for lifting the cd's I'm thinking of an expanding plug, off a servo and a limit switch set up, have seen "Jack the ripper bot" and like the way his pick up worked. 

Was thinking three bins "To rip", "Ripped", and "Failed to rip" 

Thanks for the info on your own work. I'll investigate that further.

Regards.

Dave