AEG UN 6.03 Technical Information download pdf (Page 103)

Practical A.E.G Upgrade 2006

ROF-wise, why (and why not) should I replace the stock plastic

bushings with ball bearings?

A bushing is simply a round tube that reduces sliding friction. The shaft rotates

by sliding on the inside of the tube. On the other hand, a ball bearing allows the

shaft to rotate by rolling.

Ball bearings allow smoother gear rotation and can save energy (15% better

energy efficiency). You will also see a small increase in ROF. However, they are

almost as fragile as plastic bushings when under high load and are in general not

recommended for anything over a PDI 120%.

Use ball bearings primarily for energy saving purpose. They do allow

the gears to spin smoother and “easier”.

Mixing and matching ball bearings with metal bushings do NOT hurt (UNLESS

you have them mixed and use in pair – it is NO GOOD if you use ball bearing on

one side of a gear and metal bushing on the other side). For example, it is OKAY

if you use metal bushings on the bevel gear and ball bearings on the spur gear.

Doing so, however, does not really give you any benefit (also, you are restricted

to using a weaker spring).

Some new mechboxes allow the use of 7mm ball bearings, which are larger and

stronger (can sustain M120, but are also more expensive).

7mm bearing:

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AEG UN 6.03 Technical Information Page 103