VoodooChile's CompUsa trackball info


This is my quick and easy-no fuss way to mount a trackball.  The Track ball I used is a Crystal Track ball from CompUSA.  They're Cheap and they glow red and green.

I don’t have figures for everything that I did because, well, I wrote this after I completed my project.  This is so simple that I’m sure most of you will give me a hard time about how easy this is.

Step One- Get a Crystal Trackball from CompUSA and Void your warranty by taking it apart. This is easy It’s only the board and the ball.

(No picture)

Step Two go to Home Depot and get a decorative trim ring for a halogen light (it’s like three bucks) or go to Best Buy and buy the cheapest track ball they have with a removable ring around the ball.

Ok you have your trackball apart and your ring from wherever. Now solder up your wires for your left and right buttons (This is easy - If your not sure which wire goes where, just get a couple of pieces of wire and and clip them to one of the three leads coming off the switch.  Plug the mouse in and attach a clipwire to one of the remaining two leads.  When you touch the two wire together and the diodes on the trackball turn from red to green…you've got your man.)

So you have your wires soldered, your trackball apart and you have decided where to mount your trackball.

The board for the track ball is about 5” long and 3 ½ inches wide.  The ball ‘rests’ on the rollers for the PCB’s.

You have a couple of choices now - you can drill the hole for the ball and then on the underside of the control panel route out around the hole to provide the reveal you want (how much of the ball sticks out on the control panel) . . .


This is NOT the method I chose, for one I don’t own a router even though they are relativly cheap to buy they get yah on those router bits. The bits can cost forty bucks and up. A little steep for a one time thing.

So what I did was simple and painless. I took my drill and I cut slots out for the wheels of my pcb’s to turn freely.

These only need to be about ¾” long and a ¼” deep.  I accomplish this with a big drill bit and a file.  I drilled 4 holes as close together as possible and then filed out the channel.  After you have your channels in you may have to chip and dig at these channels a little more once you assemble everything.

Now Drill two holes about 2 ½ “ from the Center of the trackball hole.

My figure doesn’t really show but the holes should be in a straight line.

All you need to do now is make the ‘holder’. Get a 1/8” piece of poster board.  You are going to cut a piece about 3” by 4”. Then drill three holes in it. 1 for the trackball, 2 for the carriage bolts.

Remember all of those holes inside you have laying around from when you drilled for your buttons?  They make perfect spacers.  Here is the underside of the trackball WITHOUT the Holder in place. 

(Note the two White pieces of plastic are and were only temporary)

Now make a trackball sandwich -  control panel, carriage bolts, hole spacer, trackball board, holder, washer and nut.  Drop your control panel into your machine, hook it all up and away you go!

I know some of you are saying cardboard?  Trust me - I have a 10 year old nephew and an 8 year old niece who BEAT this trackball and I swear it works great.

Oh, don’t forget to put your ring on (figure 1) and your all done.

Good luck and if you have any questions e-mail me.

Excellent!  Thanks Ray!

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