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IMHO the main benefit of a big name is they keep their workstation platforms 'certified' with major CAD and analysis software packages. Also IMHO having a 'certified' system configuration is only beneficial if there is a bug then they will actually invest a little bit of time to resolve it. If...

I deal with rotating assemblies and rotational inertia comes into play in three ways. 1) startup torque (if mechanical loads are significant at zero- to partial- speed, then the added load of rotational acceleration may exceed driver torque). 2) Estimating the time to reach full synchronous...

I picked up Inventor Nastran last year because its part of our corporate license package and was getting little use. I taught myself based on my knowledge of Creo Simulate (and years ago, Ansys Designspace connected to SolidEdge). With that background it was straightforward. Big picture: I...

My company has a Techstreet corporate subscription. Getting a document added to the common subscription costs more than buying a single copy. I guess that's because it's available to a multitude of readers simultaneously. So it's not cheap. I don't know of anything that gives standards for a...

Yes, this is common with vertically-shafted industrial agitators. The shafts are hanging rather than stacked, but because they are rotating the straightness might be more crucial. Good agitator shafting has the coupling faces extremely square to the overall centerline of each agitator shaft...

There is no fatigue analysis that is superior to having made hundreds or thousands of the component that have operated without failure over the course of years. If that is indeed true and they have adequate quality controls. Is this component advertised and sold as being compliant to BPVC or...

Fatigue is considered to be a couple of modes: first, dislocations in the crystal structure shift around and move to grain boundaries. Second, these become cracks and the cracks grow at a rate proportional to the load and cycle count. Third, these cracks from microscopic to macroscopic. I...

Indeed - many machines and structures cruise along its usable life with few obvious changes for most of it. Then when it really finally breaks down, it breaks down quite quickly. So while the probability is/has been low, as time passes that probability is increasing. It's a true logical fallacy.

Something as simple as cubicle walls - is really a very big question. I once endured an 'efficiency' consultant who insisted that open office / high collaboration layouts were the best thing for everyone. It became clear after a couple of days he relied on collaboration to do *anything*. He...

Might be worth a call to Black Dog Propellers or someone else who has Prop Scan to see if they can improve the design.

I've seen it done by placing the part with the machined/dowelled face vertical to the table and then set dead perpendicular to the table using a precision square. Then the height gauge will give direct readings in that coordinate direction. Then to get the other coordinate you repeat the...

I think you're dealing with fundamentally opposing requirements by expecting it won't bend but it will be soft enough to not scratch the part. You can definitely experiment with work hardening the brass. But again, harder increases the risk of scraping your workpiece. You can experiment with...

When it comes to lubrication and tribological issues, nothing beats testing and real-world experience. I only apply guidelines and book knowledge when there is no real-world tested configuration or when there is substantial reward for taking the risk.

In my experience of gears operating in grease, you want to fill the entire cavity with grease so that there is some heat transfer and lubrication is assured. With high enough rotating speed the grease will be pushed aside and the teeth will become lubricant starved. So we use a #0 or #1 NLGI...

Is grease being discussed as a preservative or as the operating lubricant? If it's operating, what's the PLV?

I pulled it into Creo and all of the components were on a layer called '200' and that layer was turned off. Not sure how to explore that in Inventor but I hope that helps. David

They are synonymous to me. Norm is used when the German 'norma' or French 'norme' are already in circulation. David

FWIW I'm seeing very springy structures. While they might in theory hold enough elastic energy to break a fastener, bolts aren't brittle and when they break they yield / stretch / crack before they fracture. So the clamping load would be released gradually and without fanfare other than losing...

The best materials will still be notch sensitive if your surface finish and lay mark direction are not good.

Agreed. Unless ASTM references this outside standard (something I don't think I've ever seen in an ASTM published standard), it's moot. If I was working with an ASTM specification I would only refer to an outside standard if I was 100% sure ASTM didn't have the content already covered in some...