Confused about linear bearings....

[greenene]

It's time to replace shafts and bearings on my k2cnc 2514. The lines on the shafts are a mystery: I don't know what caused them. Only removing them and inspecting them closely will tell me the cause.

In the meantime, I noticed on the k2cnc site, that they refer to my "linear bearing" as recirculating bearings. The only thing I've found regarding this type of bearing are the "square" type bearings, the ones that are usually found on flat shafts. The round ones have either one single row of bearings, or several rows. For example, the bearings featured on vxb.com have multiple rows of bearings, while Misumi shows only one row, either in "single" or "double".
And there's no mention of "recirculating". All I need is a good set of shafts and bearings that match at a reasonable price. Ideally, the shafts should be the same length of my current shafts--which means that they need to be custom cut.

One more thing, is there a simple way to cut a hardened shaft.

thanks in advance.
tony

[RICHARD ZASTROW]

Try an abrasive cut-off saw.

Dick Z

[Glacern]

Hey Tony,

All round shaft linear bearings have recirculating ball bearings, unless they are bushings, in which case they have no ball bearings at all, just solid sliding material. With recirculating bearings, there are paths molded into the bearing elements for the balls to roll in a continuous loop.

We recently started carrying supported linear rails and block that are interchangeable with VXB's. We recommend using supported shafts whenever possible due to the drastically enhanced rigidity.

20mm and 25mm bearings have 4-rows of recirculating balls, while 30mm bearings have 5-rows. This should be standard across all brands.

GMT Linear Motion Components

-Sol
Glacern Machine Tools