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Good, It's common for people not used to profiled rails to think they would glide as if on air when they are actually quite stiff. Preloaded ones are even worse, they can feel as if they have sized...

99.9999% Sure they will be correct. I did exactly the same first time I came across them so yes I know that feeling you felt.!:dejection:

No they will be correct, they are twin start screws. If you look carefully at the end you will see multiple threads, but it's easy to check just rotate the ballnut and measure how far it moves.
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Are you sure there aren't just two threads on the screws? I initially thought the same thing, then realised if I follow one helix it goes 10mm in one rotation.

I agree 100% and having built them both ways I know this to be true. The difference between them is so negligible it doesn't matter in all but the hardest materials which typical routers are NOT...

Cat5 or 6 will work provided it's shielded and you ground one end of the shield at the star point.

Depends on the amount and size of your cables! I measured the diameter of each, approximated them as square boxes, and then calculated the internal area needed. Then you want to fill to about 60%.

Never used DMM but I've heard good and bad things so who knows, you just have to try then make up your own mind.!

Ask fred about C5 because I've had C5 from him before and I think he even has or...

400W with a 2:1 on 10mm pitch will be fine. The ratio will double the torque and Like you say you won't need more than 15mtr/min, in fact, you could go 3:1 or 2.5:1 and still have plenty of speed.
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You won't need to adjust it to that degree. I don't use Linux CNC but believe it just works like any other gantry squaring routine in that it sees the switch and you tell it in software how far from...

Yep there's always going to be some trade off with design like this, you just have to decide which is most important to you.!

Different manufacturers quote different numbers but I think it's roughly 6 teeth before you have to start lowering the HP rating they can handle.

However, your problem will be the smaller pulley...

Yes and no, Yes if you have room but I only use them on X & Y as it can make the Z a little wide.

Yes exactly for that reason! The machines I build mostly go to MEN in SHEDS type users or small business where the speed or high resolutions etc servos offer isn't needed. Reliability and simplicity...

I believe I already answered that in details...

Nordic be careful here because it's like comparing apples with oranges when comparing Yaskawa motors with Cheaper Chinese motors. The price difference is big and so is the quality. I'd also guess to...

Have you considered soft limits?

You can't be serious.? You are using a rotating ball-nut on the Z-axis and you think he's going overboard with things.!

That design with the screw sticking up 400-500mm above the z-axis when at...

No didn't forget the forum is playing silly buggers again and won't let me upload the pic. I'll try again later.

Ok well first, the ribs on the front plate add virtually nothing but weight because the plate is fastened directly to the bearings with no overhang, it's also short and strong so very little...

DIN874 is the degree of flatness and relates to the high and low points of steel rule(straight edge).
DIN875 is the degree of squareness for set squares.

There are 4 grades in each class 00, 0,...

We can calculate a decent approximation to the inertia of all the parts in the system using this formula for the moment of inertia of a cylinder:
I=\frac{1}{2}\rho\pi r^4h

Just break down the...

Answers to questions:

1) Ballscrews give a very large mechanical advantage. You do not need to worry about the weight of the Z-axis so much. See here. You'll be fine with a generic 3Nm motor and...

A Tutorial on motor torque calculations

A question oft asked on MYCNCUK is "how big a motor do I need?". There is no simple answer to this, and the options are usually:
a) follow someone elses...