800K eject motor failure

[mactjaap]

The eject motor of one of my 800k disk drives is broken. This motor pulls the eject mechanism to the back and the disk will come out. Without the engine the disk is kept in the device and you have to get it out with a paperclip in the small hole in the front.

One of the small plastic gear wheels is broken. I have replaced the total motor of one of my spare drives, but I would like to repair it because it is from a working unit. Did one of the members of the forum this before? Where to buy these kind of small parts? I tried in a shop with model trains, but no luck.

Here are some pictures so you know where I am talking about.

The disk unit with the motor. You have to remove the two screws (green) and you can remove the motor. Don't forget to remove the small connector too.

Here you see two motors. The top one is OK and the bottom one is the one which is broken. I'm missing the most right gear wheel. This one has two wheels. A smaller and a bigger in one wheel. The defect wheel is on the table most right.

Remove these three screws to open the motor.

 

[techknight]

you can build a CNC lathe fairly cheaply depending on how you do it.

You could put the gear in some kind of CAD software, such as jetcam and have the CNC file it produces, make a new gear for you. just use a very fine routing lathe bit in a rotary tool, for the CNC to use.

 

[H3NRY]

This seems to be common. I have two drives with the same broken gear. I suppose the plastic becomes brittle with age?

 

[mactjaap]

Yes... You're right!

It also seems that the plastic of the broken gear is different from the rest.

I got also an advice to look in broken dvd players and printers for spares.

 

[trag]

you can build a CNC lathe fairly cheaply depending on how you do it.
You could put the gear in some kind of CAD software, such as jetcam and have the CNC file it produces, make a new gear for you. just use a very fine routing lathe bit in a rotary tool, for the CNC to use.

For just this one part, it would be cheaper and easier to use one of the 3-D printing services springing up all around. Still, that gear would probably cost $30 - $50 from such a service. That seems to be their minimum. Might be cheaper if he orders several of them.

 

[techknight]

depends on how common of a problem it is. might be worth to have a CAD/CAM drawing made. and several copies made, might be worth while selling then.