Here we go again . . . MK4

[routercnc]

I've been busy with other projects but back on it again and ready for some updates. I've had to re-read the last few posts so see where I'd left off so apologies if I repeat something.
Last time I left you in suspense over the holes in the side of the bracing pieces. Here they are being machined:


All 4 pieces machined:


Two of the holes need to be M8 tapped, and one is a clearance + counterbore. Here is the counterbore being done.


Bit nerve racking for 2 reasons. Firstly the pilot hole was machined blind on the other side, so I had to hope I'd got it all lined up so that the counterbore appeared in line with the hole. As you can see it was all OK:


Secondly, part was a bit close to the chuck. I'd measured it and knew it would clear. Clearance is clearance as they say but still glad it went OK. . . .


Then tapping the M8 holes on the bottom:


All 4 parts done:


_____________________________
Then back to the side panels. They needed holes on the sides which is always a bit more awkward. Got them dialled in:



Machined the holes and noticed that the top edge had a slight climb to it across the width with one edge 0.05 higher than the other. I guess this is reaching the limit of my current machine when cutting out a profile. So I took a very light skim to get it square again. This needs to be square to make the whole box square:


Repeated for the other one, then placed them machined edge side down onto an assumed good reference surface (lathe cross slide) to get them level with each other and then clamped them together:


Then machined the other edge, by taking a minute skim off, and then machined out the holes:


Then tapped the M8 holes:


Final dry fit of everything:


More to follow . . .