The Happ 2.25" Trackball
Some time ago I
won an ebay auction for a used 2.25" Happ trackball. The auction also
included a set of new rollers and replacement ball. It was to be a
chance for me to investigate one up close and to see if it could be worked
into a controller design, perhaps a cocktail control panel. However, a buddy mentioned he
had a use for his WIP BarCade. As I am both a generous fellow and
someone with too many projects as it is, the newly cleaned trackball will be
making a trip to his residence sometime soon. Anyway, here is a quick
rundown of what I did.
What I did
The trackball was filthy and it didn't roll
smoothly. Actually, it didn't roll at all. It made a nice
grinding sound when it was given a 'spin'. The encoder
wheels were rusty looking but were in fine shape otherwise. The
trackball casing was covered in dust and accumulated grime. It
certainly did not look the best as you can tell from the picture to the
Trackball with extras
As mentioned above it came with a
brand new, extra ball and rollers that were still in their packaging.
Now was the time to swap out the old rollers for the new.
The trackball casing came apart
easily by removing the six screws. The inside, I discovered,
was even dirtier than the exterior. The rollers were worn and had a
thick coating of rust on them. There was dust from the rust
Count the rusty rollers
I removed the first roller and unscrewed the encoder wheel
from the end. The two bearings on each end of the roller were then
removed and cleaned up. Very carefully the rust was removed from the
encoder wheel. I didn't want to bend the wheel as it is not a very
thick bit of metal. I then cleaned the interior space previously
occupied by the assembly as best I could. Once this was complete, the
bearings were transferred to the new roller, the encoder wheel reattached,
and the assembly reseated into the casing. This was repeated for the
other two rollers.
Still not clean...
Two rollers replaced
Next the casing top
was cleaned, both inside and out. The interior lip was coated with
rust (surprise, surprise) but came clean easily.
Once that was
complete, the optic boards were situated properly, and the top of the case
reattached. The six screws were installed and the ball was given a
test roll. Amazingly, the ball spun smoothly. All told, it took
about twenty minutes to give new life to this tired mini-trackball.
Hopefully it will find a happy new home in a BarCade sometime soon.
All cleaned up!