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Need help - Mac 512Ke floppy drive

Need help - Mac 512Ke floppy drive Troubleshooting 54 posts Nov 18, 2014 — Dec 23, 2014
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#31 Wed, 10 Dec 2014 - 23:22
So I just realized that I selected the worst possible material to print that part!. They do have an ultra fine detail option which I will be testing next. I have high hopes that it will work I will post progress soon!

#32 Thu, 11 Dec 2014 - 01:16
Is the small side of the new gear, the part that's supposed to be making contact with the gear to the left of it in the video?

rather than the front side which we can see a gap?

#33 Thu, 11 Dec 2014 - 01:34
The new gear is on the far right. It is a compound gear, so it has a small gear at the top and the larger gear at the base. The one at the top is making proper contact. The one of the bottom is completely missing the master motor gear driver which you can see is not moving. It is the small golden gear. In confident the new part I am printing now will work.

#34 Thu, 11 Dec 2014 - 02:19
I didnt think 3D printers had that kind of resolution. thats neat. 

#36 Thu, 11 Dec 2014 - 08:44
^ wow

#37 Thu, 11 Dec 2014 - 13:41
The latest 3D printers have quite fine spatial resolutions.

#38 Thu, 11 Dec 2014 - 17:06
It looks good. I agree, it might be a resolution problem. Or the plastic shrinking a tiny amount when it cools. I know you will get it, gnolivos.

What type of cad program, and printer are you using?

#39 Thu, 11 Dec 2014 - 18:21
Solidworks for cad. Shapeways for printing.

#40 Fri, 12 Dec 2014 - 00:06
What is the diameter of the necessary gear?  I see some 3010 gears on Ebay but it looks like they're about 16mm in diameter or a little more than 1/2 inch.

Ah, here we go.  I was just seeing collections of many sizes, but here's one made up of several 3010-2B gears:

http://www.ebay.com/itm/20pcs-New-3010-2B-Plastic-Gears-Modulus-0-5-Robot-Parts-for-Toy-DIY-Accessories-/161182886963?pt=Radio_Control_Parts_Accessories&hash=item25873fac33

Big diameter is 16mm.  Small diameter is 6mm.  Is that too big.  Above TK wrote that the gear is smaller than a dime, so I'm guessing it is too big....

#41 Fri, 12 Dec 2014 - 00:11
Diameter of the large gear is 9.4mm. Believe me, I looked all over the Internet and found several places selling these, but nothing in the exact size.

#42 Sat, 13 Dec 2014 - 07:13
I have generated precise CAD for all four gears of the floppy drive. I am currently printing them in fine detail, and will be testing as soon as they arrive. I would let you all know if this works out the way I expected to.

#43 Sat, 13 Dec 2014 - 13:02
arrive? as in you have to order them? 

#44 Sat, 13 Dec 2014 - 13:43
Yessir. I print at Shapeways.com

#45 Sat, 13 Dec 2014 - 14:40
Ah. I see

#46 Sat, 13 Dec 2014 - 18:17
A quick nerdy update to keep us all entertained  :)

As long as the parts can print with fine enough detail, this is going to work like a charm, and we will be able to rescue a lot of 'bad' Mac floppy drives/motors.  I heard from a few of you, that not only the smaller gear gets damaged over time, so now we will have a full set available to fix these floppy eject mechanisms....  if all goes well!

Heres some proof, a quick motion analysis I made of the parts I created (reverse engineered).  Everything seems like it would engage properly with clearances etc.

#47 Sat, 13 Dec 2014 - 19:04
Super awesome!  i love it.

#48 Sun, 14 Dec 2014 - 14:22
Render...

image.jpg

#49 Mon, 15 Dec 2014 - 23:40
More fun info while I wait for the gears!

#50 Tue, 16 Dec 2014 - 16:53
You might want to check with some of the custom gear companies on-line and get a quote.  It might be cheaper to have 100 sets run off than to print 20 sets.   I don't know, but it's an avenue worth investigating, I think, unless the printed gears are already very affordable.

For example, when I needed a new gasket/seal for my vintage digital watch, I was able to send my last unused original to an O'ring company and they ran off 200 of them at less than $.50 each.   Of course, I don't need 200 of them...

For example, you might ask for a quote from these guys: 

http://www.rushgears.com/Replacement_Parts/

#51 Tue, 16 Dec 2014 - 17:19
I can get a full printed set for about $17. Not bad.

#52 Mon, 22 Dec 2014 - 20:55
Does anybody have a donor floppy eject motor that they want to give away to me? I really only need the black plastic enclosure, I managed to break mine and I can't further test of the gears although it looks like ithey will work very well!

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