cnc for marble

[JAZZCNC]

That doesn't necessarily mean that R&P is 'the ideal solution'. Hate to say the obvious but if everyone jumped off a cliff would you join them? R&P is great for a number of things, I think primarily where you have a very long travel. Is it ideal for a machine where you primarily need smooth slow speed movement in a travel length acheivable by a screw? I don't think so but thats just my opinion.

You obviously never built a large machine.? If you had you'd realise the complications involved with using long ballscrews and why R&P is more suited so therefore Ideal for this application and why it's used. Got nothing to do with following the crowd it's a practicle solution that does the job.

Yes sorry if it came across as me suggesting you use fullsteps. Of course you should use microstepping. What I should have mentioned is... referring to my link http://www.micromo.com/microstepping...-and-realities

"[I]The real compromise is that as you increase the number of microsteps per full step the INCREMENTAL torque per microstep drops off drastically. Resolution increases but accuracy will actually suffer.

Ok here again we have typical Theory not matching real world usage. These things your reading while true have no real world affect on how the machine performs, well not that you'll see while using.
There are so many variables that come into play that affect the performance so much more than these technical technical details. Quality and spec of drives and motors along with voltage will have much greater affect, as will Machine stiffness and Resonance.

Motor Ms theory is based on Fixed parameters for a particular motor/drive/voltage/ combination which mostly goes out the window in real world because of too many variables make the machine setup a moving target.

The simple fact is that what your quoting from the article regards Ms/torque etc doesn't have any noticble affect in real world use because of all the other variables come into play. But running the motors in MS range that lets them get affected by resonance certainly does. This is a 100% fact not theory with 95% chance of happening if you run at full step with poor spec components.!

When the machine is built you can still run it at whatever microsteps you like, nothing stopping you doing that.

Sorry but again this not true. There is a limit you'd run at. Running too high causes all sorts of undesirable results which have a negative affects on performance and system.
The simple fact is that there is NO IDEAL setup and each combination of components and machine design/Stiffnes needs to be setup to suit that machine. . . .But there is a Limit.!!

We are not going to agree on this probably but I'm sure you'll come to realise what I'm saying when you have built a machine.!