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The build is largely on hold. With now six month old twin baby girls, I'm at a level of sleep deprivation where I'm not sure I'm safe around power tools. ;-) Fortunately, the day job involves mostly...

This is where you have to get creative a bit, I believe. On the one hand, the larger internal opening of the larger square (e.g., 90mm x 90mm) extrusions can probably allow inserting the screw from...

People have reported good results using the stuff from Orange Aluminum. It looks to be cheaper than Rockler.
T-Track - T-Track

The sun shone brightly through the window. Outside, the gentle winter sun bathed each verdant shoot of grass with its gentle warmth, encouraging it, nurturing it to strive harder in its quest to to...

Not too much progress recently, I'm afraid. This summer in Houston, we had sustained temperatures over 100 degrees for way too long. Then I had some extended business travel. And then we had twins......

I'm not sure that I'd worry too much about parts availability. The stuff from THK, NSK, etc., all seem to have stuff pop-up on eBay all the time. Conversely, I would expect Chai's stuff to largely be...

If you need a fair bit of speed, then go with Chai. Otherwise, an ACME screw should deliver what you need given that size. You should also check eBay more generally, though. You can often find full...

In theory, the SHS and HSR rail profiles are common between them. Louie's experience is a little worrying in that respect. If you really want to take a flyer, I read a PowerPoint presentation from...

Unfortunately, I got to the "tool steel" part of the program about the same time that the weather decided that the upper 90s wasn't hot enough. Since my shop and my garage are one and the same, and...

Looks like a really solid connection for an 80mm spindle. It also looks like there are two sets of mounting holes on the website. What are the hole spacings? One would obviously be 1.5" wide...

To add on: A couple of the screw models (e.g., BNT, IIRC) are available as both a rolled and as a ground screw. Just knowing the product line of the screw may not be enough to determine rolled vs....

I'd have to dig up the references. I haven't played with Nook's stuff in a long while (I have THK and NSK screws, so I mostly troll through their tech bulletins these days), and I never paid much...

Now you are getting into a more complicated question (system-level vs. motor). Assuming the same payload for each and decent quality servo drives, the motor attached to the ball screw with the 5mm...

Smaller lead screws are less efficient (more binding) than moderate lead screws, but as I indicated above, my understanding is that once you convert the linear (axial) motion into radial motion via...

Try this one instead. I remembered to save a copy of it to my hard drive in case this one is broken within hours of my referencing it.

https://tech.thk.com/en/products/pdf/en_a15_057.pdf

Please refer to page A-718.
http://www.thk.com/documents/us_pdf/products/generalA/en_A_711studying.pdf

The torque required to turn a ball screw is simply the load multiplied by the angular...

Archimedes, huh? Let's run what my simple, tired, newbie brain can figure out, and then I'll hand it over to you:
500ipm = 211.67mm/s
211.67mm/s = 42.33rps (@5mm/rev)
42.33rps = 8,466.64 pps...

Misumi's Us website: us.misumi-ec.com

They have a 30% 'off' your first order promotion going on (limit: $150 rebated back to you). A lot of the stuff I am getting made has 'Made in Japan' on it,...

Yes, it's my original screw and BK/BF brackets (came with the screw). The screw is 25mm in diameter with a 10mm lead (basically 1" and 2/5", respectively). I might be able to reclaim one of the BK...

See post #11.

It is machined for two BK brackets, but not the manufacturer's own BK brackets, as near as I can tell. At least not the ones they currently sell, but these products seem to have a LONG market...

It's an OLD (1994) screw, but allegedly NOS (crated). It has some slightly odd machining, but I think it's doable. I'm still working through the tolerances and clearances right now. It's going to be...

More travel - definitely. My target material is Baltic Birch plywood, which comes in 5'x5' sheets. I could not find the right ball screws to get out to 5' wide, but I will be able to do a standard...

As anyone who has spent time in product development knows (or if you've ever built/remodeled a house, etc.), the later the design change, the riskier and more expensive it is to make the change. With...

I'm not sure how you get from 1N-m to 700oz-in, but you're right. In all of that, I was just advocating slapping any old random motor with a higher torque rating into the system.


As I said, I...

They don't do so with the same amount of available (shaft) torque (more back emf in the higher inductance motor). However, it seems like we are talking in circles. It seems like you are coming back...

Specs are specs. If a manufacturer wants to lie/cheat/steal, then so be it. However, most people who work in manufacturing rely on specs at some point, even if the engineering samples from selected...

Agree on the charts, but they may die off quickly or need to be converted into something more useful (e.g., the one I linked, above, stopped at 6,000pps or 1,800rpm) or have transforms on the axes...

In general, yes, but for good and very specific reasons. Stepper motors are, effectively, constant power devices - though you have to calculate both the power delivered by the shaft AND the back EMF...

Looks good! You are WAY ahead of me. :)