Nice design

 

Bigger is sometimes better. There might also be interest in a larger format CNC machine that can easily be converted to an intermediate size, using the same rails but with adjustable plates that can effectively "choke up" on the rails to produce a machine with greater accuracy and repeatability. Rather than using plates screwed to the ends of the rails, it would use sliding plates on the sides of the rails, that could set the effective machine size to slightly greater than the planned project size. Maybe it already exists.

 

I do appreciate some of the advantages of your design. My build of the C-Beam XL is in the early stages, and I tend to do things very slowly and deliberately.

 

Nice design. I am currently building something almost exactly the same.

Have you thought about supporting the X axis gantry with a custom shaped plate (like the OX) rather than the vertical rail sections?

 

Liking the looks of this!

 

Can you explain further what you mean by "admittedly modular joints have a tendency to introduce more error than their fixed counterparts"?
And another question - which of the Openbuilds plates did you use for the two Y-movement beams with?

 

Really nice design that looks like it is going to perform very well! thanks for sharing!

 

Nice and simple. I am new to this and have just started planning one of my own, which oddly enough is similar. Now I see this and it gives me some ideas on how to finish my design

 

I love the simplicity of this design. And it could easily be scaled to any reasonable size.

Looks like you are using standard Openbuilds plates rather than custom plates. Which Openbuilds plates are you using on the Y and X axis?

 

Looks to me that you have used a total of 6 XL Gantry Plates. Is that right?

 

Perhaps you could offer options of the 500 mm rails in either direction for those of us that need the space saving.

 

This is the design I am going with. Makes sense and is a efficient use of existing parts for those of us that cannot currently fabricate aluminum parts for plates. I would like to go with a 1500 mm by 750 mm size (approx.) Do you see any issues with this length of C Beam as well as lead screw?

 

Is the OP still active here ? How did you mount 3 wheels on a single screw on the z axis? I can't figure out and the longest screw is 65mm which doesn't seem to be long enough to have it work like the picture, what am I missing here?

 

Thank you that makes much more sense I am new just got my parts in. How can you tell where the eccentrics are, still couldn't figure out where they should go, and if all wheels need one, why they are needed etc. ?

 

Those links did clear up a lot of questions thank you. I have a couple more if you don't mind, I see that only one side needs the eccentric, does it matter which ? Also, how did the OP mount the two plates to each other on the z axis ?

 

Thank you again, I am confused about one more thing, what is the difference between nut block and anti backlash? I ordered all anti backlash. Also I see some builds using double nut blocks. Is it ok to use a single anti backlash on all axis'?

 

I am still not too clear on how two plates are joined at the Z. I packed up everything for now due to not having time but I look at that thread you have shared almost everyday. I see the images where screws are inserted on both plates but its not clear on how exactly they are joined? Do plates have threads for the screws?

 

Just use a nylon nut on the other ends then?

 

I am guessing it is just a nylon nut, I want to be mentally prepared for all the questions in my head so when I start building I actually finish it