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Its looking good Jeff. I've used a similar design for my gantry. I took a tip from Jazz-CNC that its easier to assemble & align it if you use 2 separate plates bolted together (see picture) -...

If you use a certain size aluminium profile for the gantry (90 by 45 mm I think) you can mount the BK/BF ballscrew supports directly to it, which makes things easier.
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Thats exactly the idea though I think most of the drawings you will find on the forum use the same size section for both pieces. Whether that is for simplicity or there's a sound reason to do with...

Jeff,
Looks good so far, you've obviously put a lot of time and effort in already.

The most obvious weak point you will get picked up on is the gantry. That single piece of upright profile may be...

IMO The advantages of "taper-lok" and my DIY ER solution is that they are more compact, better concentricity, better grip, no damage to the shaft from grub screws, infinite ajustability and...

I'd give these a go on the ballscrew end.
Needs a bit more research but I've seen them on aliexpress.

https://www.aliexpress.com/item/4000311379356.html

Edit:
Amazon is much more £...

Yes and No.?

The problem with using the switches to get the square is you are applying twisting forces on the gantry/linear bearings/ball screw combination causing friction that will very quickly...

Yes but you likely need to square it when you first build it.

The other thing to think about is for an axis with double ballscrews you need to be able to square the gantry. This might mean being able to rotate one ballscrew very slightly by hand (without the...

Yes, the LC60H2102 and LC60H2127 with LCDA86H drives for the Nema 24. For the NEMA 34's I use the 10Nm LC86H3156ZB 3 phase motor with LCDA2260E 220V drive.

I buy them in bulk (100sets) and have...

Need to do more research but the CL86Y atm.
I'm still pondering about going closed loop later down the line. If this can run in open loop as well (for the time being), then I'll get it right now.
...

Surprisingly it does Muzzer.! . . Esp with a stepper system on long screws and smaller steppers feel it the more and really struggle with it if the pulleys are heavy. This is why when building...

Taperlocks are used extensively in industry, I have made my own using ER collets, pic of one on my bench mill and one on my router, both driven by servos

Even with motors of near the same inductance is proven.

Results using 60V on a G0704 sized mill, all driver settings identical, X & Y axis:

Nema34, 1080oz (7nm and change) 3.5mh inductance:...

Yes, my machines are a 3.5 tonne Shizuoka, a 1 tonne Bridgeport milling machines and a Colchester lathe. The ballscrews are mostly 32mm and 25mm and they all have servos, so as Jazz says, the...

Well, that's a good thing you haven't ordered anything yet because you need to decide if it's a Router or a Milling machine because when it comes to component choice's they are very different, and...

I've got a 112mm taper lock and it is weighty.
It's for the 1.8kw servo that's going to be for a mill spindle.
Wouldn't fancy that on a ball screw!!!.
Going to have a go at lightening it with...

Wait there's a big difference between a router and a milling machine so it's not that simple.!

The milling machine is often rotating the ball-screw much slower with a lower pitch ball-screw. A...

I've used taperlock pulleys wherever possible, as they are much more secure and concentric than keys and grub screws and are often seen on professional machines. As you say, the main disadvantage is...

Welcome aboard Jeff.
Looks like you have a good head start from your 3D printing experience and work on the MPCNC. Looking forward to seeing what you end up building.

Kit

Welcome!, it sounds as though you've learnt a lot over your introduction and I (and I'm sure many others here) will be interested in your thoughts and design of a new machine.