I have been looking at THK linear bearings. Do they only support substantial weight in one direction i.e. lying flat or can they be edge mounted? I am referring to the ones with bearings on both sides of the rail. Is there a substantial advantage to these units over the DIY steam pipe and roller blade wheels for a wood/sheet aluminum cutting router for a home workshop? I have a bit more money than time and figured that buying those bearings might make for a simpler, more rigid machine but I am a bit too green to really know. Can anyone set me straight?
thanks
Scott