Looking to learn how to use eccentric bushings for v-wheels.

[groomden]

This might be a dumb question...

How do you use/design/install eccentric bushings like those found here:
http://www.cadcamcadcam.com/eccentri...ovewheel2.aspx

Is it basically a matter of hold the bushing with a wrench in the position you want and then through bolt the bearing or something more technical than that?

In general, I'd like to know a lot more about placing/using these types of bushings.

Thanks!

[ger21]

Yes. You use two concentric bushings on one rail, and two eccentrics on the other rail.
You then turn the eccentric with a wrench to preload the system, then tighten down the bolt running through it to hold it in position.

[Geof]

Turn the eccentric bushing clockwise when adjusting it. This way as the bolt is tightened it holds it in place; if you have turned the bushing counterclockwise it tends to loosen a bit when the bolt is tightened.

[groomden]

what about hole sizing? I picture there being a gap -- is that a big deal with eccentric bushings or does everything stay locked together for the long haul?

[Geof]

No big gaps. The hole through the bushing is a normal clearance on the bolt and the hole the bolt fits into is the same, either a through hole and nut or a tapped hole. The load is taken more by friction between the bushing and the surface it is mounted to.

[schbrownie]

When you make your design (on paper) use only concentric rollers. I know this sounds weird, but it will make your life a lot easier! When you actually make your router, substitute the eccentric for concentric bushings/rollers on one side of your router.

You want to make sure that the eccentric rollers see less load than the concentric rollers.