V-groove bearings and aluminium angle

[Yvan256]

First, keep in mind that I'm still in the research/just started building basic components stage, so maybe I missed something, but...

every time I see those v-groove bearings used on a machine, the design use a minimal surface of the bearing itself. People use them on thin edges and that puzzles me.

Why aren't people using v-groove bearings on aluminium angle (in the ^ orientation), since those v-groove are 90 degrees on the inside, just like the corner of an aluminium angle? That would maximize the contact surface and probably result in a much stronger machine, IMHO.

[ger21]

every time I see those v-groove bearings used on a machine, the design use a minimal surface of the bearing itself. People use them on thin edges and that puzzles me.

The machines that use them that way are not very rigid at all.
Ideally, you don't want to use aluminum angle at all. The wheels will constantly wear into the aluminum.
At a minimum, steel angle should be used, but the hardened track that's made for the V groove bearings is the best choice.

[EBC]

First, keep in mind that I'm still in the research/just started building basic components stage, so maybe I missed something, but...

every time I see those v-groove bearings used on a machine, the design use a minimal surface of the bearing itself. People use them on thin edges and that puzzles me.

Why aren't people using v-groove bearings on aluminium angle (in the ^ orientation), since those v-groove are 90 degrees on the inside, just like the corner of an aluminium angle? That would maximize the contact surface and probably result in a much stronger machine, IMHO.

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[PaulRowntree]

The V-groove track is running ~$1/inch here in Canada; what about steel angle arranged vertex up/down as a compromise?

It is certainly harder to mount than face down/edge sideways angle, but it could be welded to flat stock. Would the warpage be out of control? Is the outside angle speced to be close to 90 degrees?
Cheers!