Here we go again . . . MK4

[routercnc]

I've started making some of the parts for the MK4 machine. Thought I'd start with an easy and relatively quick one.
Here is the Z ballscrew lower bearing bracket. The standard bearing bracket is too large to fit in so I've made my own again. I'll re-use the ballscrew and bearing from the MK3 machine which is already turned down to 6mm shaft at the end allow a pretty small bearing to be used. Just needs a new housing to suit the new design:

Laying it out and machining the bearing pocket:


Machining the profile leaving tabs to hold it:


Cleaned it up and set up to cnc machine the M8 pilot holes (note that this is a drill press vice - a proper precision vice is on my wishlist !)


Started the taps off in the drill press (just to get them straight):


Then finished them off in the vice with the hand tap wrench:
Since I discovered these lovely spiral fluted taps there is no going back . . .


Chamfered the thread entry with my favourite snail countersinks, then cleaned out the threads with a bolt:


Done:


More to follow . . .