a Steel Box Section Build with SBR20 & Ballscrews Plus a few questions

[grain_r]

Hey Everyone
Well it's been a while since I have posted anything but I have been slowly doing a little when I can sneak off to the garage for a short while.

I have still been lurking furtively in the shadows though :)

I have noticed that since I started the Make "a quickie CNC project" that my quality of work has gone up and so things that I must have been happy(ish) with originally I have then re-done to a better standard. I would have never thought I would still be making this thing when I first started designing. but I am also grateful that I am.
It has been in my thoughts at least once a day of solving different things and I am learning new skills all of the time. So instead of the CNC creating items it really is turning out to be my actual hobby to create this thing.

Sometimes when I have had a rough day I go to the design space in my mind and build it. Okay, some might say actually physically building stuff is the way to go through.

My Hole drilling was always an issue of getting it accurate enough to be happy with but with so many possible ways it could wander slightly even using centre drills i still wasn't happy, So I have been using a little sieg x2 mini mill and that has made the job much better but it doesn't have a DRO on it as yet and so even though the mill can get to the correct place a drill can (And does) move around.

I have always stayed away from 3d printing thinking that it wasn't for me and that the quality of parts that I had seen from other people's tries just wasn't something that I would use. Well, how wrong was I.
I have purchased the Ender Creality 3 and it is amazing. sure it can create stuff that will sit collecting dust on the shelf but also it can create useful parts.
it is supposed to go to 0.01 of an mm



So I created a drill template so that even if it is wrong they would all be the same so they would be right (My Logic anyway).



I have had issues with getting the drill marks as accurate as I wanted so I made some centre drill markers and some Centre drill markers with very small centres so that I could mark the masking tape and then use a punch to get it pretty close.






So then onwards to fix my errors from my previous times. JazzCnc mentioned a long time ago about welding nuts into a hole and especially because I am using 3mm it would help. I haven't done this on all of the holes but on the not-so-accurate holes, it has worked really well.

I took the coating off with the Brick cleaning acid as suggested (I do listen )