Quote Originally Posted by fifa View Post
No, every ball-nut allow
angular misalignment, and ballnut is not designed to support radial loads.

You shall not drive screw up to critical speed, 70% limit is recommended, this is due straightness tolerances (screw is not ideally straight)...

2010 robust, however, I would say for such type of machine too big. You will not be able to work with high speeds. Frame is too flexible.

I am assuming you are from Netherlands, threrefore German language shall not be an issue:

Check this site:


Search for Minerlaguss...

kr
Dear fifa,

Thanx for taking interest in my project.


"2010 robust, however, I would say for such type of machine too big. You will not be able to work with high speeds. Frame is too flexible."

I have actually selected the 20mm over 1610 ballscrew based on lenght and critical rpm vs speed, based on the zapp automation calculator.
And some other docs i found to verify outcome.

1610 screw looked a bit thin on a 1500mm + span.

Thanx for clearing things up on using the balnutt for a virtual span reduction.


Since i am unsure about max speeds i need... i designed towards >5m/min speeds. Did i mis something here?

Although i might only need that speed for rapids?

2010 will be harder to get moving though..
but is more rigid.
trade offs..

You might be right on maybe not being able to take advantage of 2010 over 1610 on my machine.
Do you feel it is over the top?

Will i lose much speed on small movements?

1610 screw looked a bit thin on a 1500mm + span

Or will i need more powerful motors: step up to servo's.

Now working towards diy 68v psu /80volts digital drivers using 4 x nema 23's 2:1 belt reduction 3.1 / 4nm... probably zapps. not final on this.

Or will better motors be ott compared to "flexible" frame design?
Is 120/80 x80x4mm box section considered flexible? 🤤

About my design.. there will be additional diagonal bracing towards the legs.

I am starting to think i need a 50ton battle tank chassis to get a " rigid enough " base. :-)



Please specify.
Don't be gentle.


The whole idea was to skip a typical mk1 and mk2 build and go straight for a mk3 quality and size machine.



Grtz Bert.








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