Please be aware that the price is specified for 1 unit, not for a set of 3!
Ball transfer unit, designed specifically for trackballs.
Allows to make precise, pixel-based movements from the steady state.
Comparing to BOSCH® Rexroth BTUs, these are:
- Much quieter, however there is some sound when the bearing balls rearrange themselves inside. It is possible to operate the BTUs without this effect, completely silent, but only slowly.
- Less consistent — the Rexroth BTUs have pretty much perfectly identical friction no matter if it's steady state or mid-gesture. These ones, however, have very low static friction, which slightly increases at the beginning of a gesture, and then falls back to the level which can be described as "noticeably better than static bearings".
- Don't require lubrication, and can be cleaned with a thin hair toothbrush or with compressed air.
These are highly experimental, and there isn't any data/statistics on the long term use. The internal dimensions are a subject to change.