Linear bearings with low radial runout

[mwemag]

I am looking for high precision linear bearings with low radial runout and clearance. Accuracy in the axial direction is less important for my application.

I am still inexperienced in this range but I could imagine that a linear bearing, eg. ball bearing, would work in the same way as a regular rotating bearing just with the balls rotating in the perpendicular direction, assuming a cylindric center rail. Therefore I hope that a similar radial Accuracy as in rotating bearings can be achieved.

According to specifications a radial runout or eccentricity of less than 3 microns (0.003 mm) is available in high precision ball bearings, but I wonder whether this is also possible in linear bearings, since I coudn't find any clearance specs referring to linear bearing systems.

I'll be gratefull for any help.

 

[israelkk]

Did you tried Barden or Thomson?

 

[diskullman]

Most linear ball bearing manufacturers (Thomsen, Barden, NB, IKO, INA)offer precision linear ball bearings that have adjustable clearences, designated by a ADJ suffix at the end of the part number.
I know IKO has some pretty extensive application information available online at their website.

Russell Giuliano

 

[mwemag]

Thank you for your help, israelkk and Russell. Among the proposed Companies I found that IKO has the most comprehensive specifications on the accuracy and clearance of the linear motion products, together with Schneeberger, a swiss manufacturer,

http://www.schneeberger.com.

Both offer linear slides primarily rectangular not round, but that's even better. Clearance and parallelism for slides in the short distance range can be less than 2 micron in the so called "ultra precision"-version, this is perfect for my application and I'm very happy with that.