View Full Version : New machine Ideas

18-09-2012, 04:29 PM
Hey all, I may be selling my machine and building a bigger and better one,

one thought though, after using the chinese BK / BF blocks is that they're crap and the mounting holes are worse.

what does a BK block comprise of?

is it just and alu block, with a bearing pressed in and then a four screw cover to clamp it down?

has anyone made one before? if so was it difficult? As I can chuck it on my current CNC and make some parts for it :)

also, do I want an angular contact bearing or a double row bearing?


19-09-2012, 10:18 AM
I will never use BK/BF blocks on my machine - yes they can work but they need a varying amount of TLC so I prefer to just make my own as then I know it will be accurate and can make it a better shape to fit the available space.

The BK blocks are just mild steel, but it's easier to machine aluminium so I use that. You need to bore the block to the width of two angular contact bearings, put a cover on the front to press on the outer ring of the bearings to retain them and if they're single row cheap bearings you'll need a shim between them. There are plenty of examples of bearing arrangements elsewhere on this forum / CNCzone.