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Are there any good reliable sources for reasonably priced THK or HYWIN HGH rails? I'm finding lots of stuff on eBay and Ali but not so much from proper storefronts.

Does anyone have any opinions about HGH20 versus HGH25 rails for the X and Y axes? I've already settled on HGH25 for the Z axis.

As interesting as this talk about velocity, acceleration, and jerk is, let’s try to refocus on the hardware decisions that must be made long before I think about what kind of motion control...

I appreciate the insight. My background is in physics myself. The fundamentals are all simple enough, it's figuring out the realities of imperfect parts coming together that's hard.

Thanks for all the info. Just one point, the servos can't exhibit more thrust than the force required for acceleration plus the force necessary to sustain the cut plus the force to overcome friction....

Thank you. This is more useful. If I do some back of hand calculations, a 200 kg table (way more than mine will ever be, even with vises, etc.) accelerating at 0.2g gives a force of 400 N which would...

Yes, of course. The question was what performance issue was being attributed to a lack of ball screw rigidity? What evidence was being followed that lead to the conclusion that the ball screw...

I don't understand you on this point. Ballscrews take load axially and are meant to be rigid axially. They're not a rigid part of the mill in the radial direction. How are you attributing flex of the...

Thank you for the detailed insight. That's given me a lot to think about. I may spring for those screws; they look like they could suit me fairly well.

That's an interesting thought that hadn't occurred to me. Working with flat stock would allow for a number of conveniences.

I’m working on finishing up the rough design of a smaller CNC mill I’m looking to make in the near future and I’d appreciate some input on some of the decisions I have to make.

I’m shooting for...