Comments on: Arduino powered CD changing robot

By: vacuum equipment

vacuum equipment — Fri, 25 Dec 2009 09:11:05 +0000

Regards,
tamberg

By: rossasarus

rossasarus — Fri, 19 Jun 2009 21:45:57 +0000

_matt
you’re probably not going crazy. The load is (afaik) only needed when reporposing pc power supplies. I think it is a sensing circuit that somehow is useful in its original purpose. I have found a few pc psu that didn’t need a resistor, but not many.

By: _matt

_matt — Fri, 19 Jun 2009 21:05:34 +0000

Regarding the power supply:
i’ve heard multiple times that power supplies need a load (the light) so they’ll supply their full power

i’ve never had a power supply that had that requirement

am i going crazy?

By: Dan Fruzzetti

Dan Fruzzetti — Fri, 19 Jun 2009 19:56:03 +0000

OMG supershwa: I was thinking the exact same thing; it looks like a cannibalized R.O.B. I can just hear myself losing at gyromite now.

By: Taylor

Taylor — Fri, 19 Jun 2009 19:29:09 +0000

Wow. Very neat, but I could think of more practical uses for the same device.

By: supershwa

supershwa — Fri, 19 Jun 2009 17:45:36 +0000

this one reminded me of that old nintendo r.o.b. robot: http://en.wikipedia.org/wiki/R.O.B.

just not as johnny number 5 looking.

By: xyz

xyz — Fri, 19 Jun 2009 17:43:06 +0000

Here is an example that uses wooden fingers that grip the cd by the hole. http://www.sentex.net/~mwandel/tech/changer.html

By: orangesrhyme

orangesrhyme — Fri, 19 Jun 2009 17:34:09 +0000

Add CD repair (scratch removal, etc) into that and you’ve got it made.

By: benny

benny — Fri, 19 Jun 2009 16:21:27 +0000

I wonder if it could be adapted for my 8 track player?
Arduino rocks!

By: srilyk

srilyk — Fri, 19 Jun 2009 15:52:23 +0000

paul123 and rossasarus,

Instead of using suction you could use a relay with a solenoid. You could use some type of lever system to create some outward gripping jaws (like an armatron with the grippers flipped outward)

If your gripping jaw is precise enough you should be able to grip just the top CD off the stack. I suppose you could do something of a different nature to drop a CD off the bottom of the stack, but you would need a more powerful solenoid to hold the entire stack in place.

Of course, instead of a solenoid you could use a lever and a large rubberized surface. Think of a razor scooter’s brake system. Just turn the concept 90 degrees and enlarge it. That *could* work, but the grabber idea would work better (hence the industry standard).

By: rossasarus

rossasarus — Fri, 19 Jun 2009 13:28:00 +0000

Hey Paul123,
The original link was mine. I really struggled trying to find the “best” way to grip a cd. The commercial units use something that grabs the discs from the center. The cheapest idea I have found to duplicate that is to actually use the ‘rose’ (i think that is actually what it is called) from a cd case. You would need a cone mounted below it to position it perfectly on the disc, and you would need a servo or something similar to pull it off of the rose when you unload.

I don’t think your idea of pulling from the bottom will work. I think it would scratch the cd bottoms too much when the weight of the stack pushes down on the one disc sliding/dropping out.

Good luck! Post here when you’re finished.

By: tamberg

tamberg — Fri, 19 Jun 2009 08:22:39 +0000

Another project (CD juke box) with a similar mechanism: http://hydraraptor.blogspot.com/2007/06/day-music-died.html

Regards,
tamberg

By: paul123

paul123 — Fri, 19 Jun 2009 07:44:41 +0000

I have been wanting to build a simple CD loader to allow ripping of a large library of CD’s. A quite basic one that feeds 1 cd from the bottom of a stack held above the drive tray. the tray can hold about 100 CD’s. I just need an easy way to take the CD off the tray ready for the next to drop in. Any ideas? dont want suction or complex grabbers or swing arms if possible

By: will88

will88 — Fri, 19 Jun 2009 07:09:03 +0000

yo mate sum1 tryin use ur site to launch a trojan check ur flash and rss console and go mib on there ass

a faithful follower

By: 36chambers

36chambers — Fri, 19 Jun 2009 05:26:47 +0000

Something like this would be very useful if you run any sort of duplication/video services business.

I would like to see one optimized for multiple drives in a stack. With a Z axis it could load/unload multiple drives. Then it becomes a very useful tool.