Understanding the bearing block

[Rogue]

...this would appear to be the cheapest way to avoid the latteral load from the axis being transmitted into the Motor bearing. the fact that the drawing above does not show a ballscrew is a little missleading

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The radial bearing is not fixed to the drill rod but just a nice tight fit as a support for it. as you will know the shaft couplers are fixed to the rods they couple together

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there you go... Clear as mud

Actually yes, that does make it a lot clearer! I was originally thinking in terms of a load perpendicular to the shaft which was probably what threw me. I'm currently considering starting with Acme thread which is why I was looking at that particular diagram.

I was planning to just use the axis rather than introduce additional drill rod unless there is a good reason not to do so?

A pair of, or a single double row angular contact bearing, is generally used.

So one double row ACB (such as this: http://www.worldofcnc.com/products.asp?recnumber=147), or two back to back single row ACBs (such as these: http://www.worldofcnc.com/products.asp?recnumber=73) mounted in a block would perform that same function as the combination of elements discussed above?

In the original block idea I posted (not the one from the website, mine) using two ACBs, would this mean that the load is being transferred into the coverplates that are holding the ACBs in place? And as they are pressing against the plates from the inside heading out, it would be the bolts holding the plates that are actually taking the strain? Number 1. in the picture below.



If that's the case, presumably Number 2 would be a better option as the bearing block then takes the strain from the bearings.

On a side note, I'm posting links to particular products that I'm looking at for the sake of clarity and safety - ie in case someone says "that bit doesn't do what you think it does, don't buy it" or "that really is too cheap to be worth using". It's not with any intention of advertising. I hope it's ok to do this