> Hi Charlie,
>
> I would use skateboard bearings. They are available in ABEC7 accuracy
> for very little money. Skate bearings are standard 608 size metric
> bearings, 8mm bore 22mm OD 7mm thick.
ABEC7 (in a skate shop) is a marketing gimmick. For skating you want 'crap'
bearings as free running is more important than run-out. That rating is for
high-speed spindles, hence the price. ABEC1 or 'precision' bearing are good
enough.
The rating has nothing to do with quality either. Consider sealed (rubber)
instead of shielded (metal), they keep the dust out better.
See www.vxb.com, they'll sell you 100 sealed bearings for $35. (Skates need
16 bearings, boards 8, hence the odd pack sizes.)
Tony