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Hard ways are cheaper and handle a larger load. Ball bearings have much less friction. Don Kansas City

Hi: I have an application where I have many (50+) individual, very small circuit boards, each with its own independent microcontroller. Each circuit takes more power than would be practical for batteries, so I have to run a power bus to all of them (+24, +5 and ground). I also have synchronous...

The objects are actually in contact with each other with about 75 lbs force. There is no gap for a coating. That's why I'd like to chemically change the outermost surface of one or both to another compound that insulates. The contact spot is small, so I'm hoping some sort of oxidation could...

Hi guys: I am a mechanical engineer with an application where I have steel and brass contacting each other at a point (think of two spheres contacting each other). I need to electrically insulate them from one another, but it is impossible to add a physical insulator between them in this...

Most new calculators don't even have grads on them anymore. It's some sort of metric that never caught on. Don Kansas City

Yeah, I guess you're right, Fox. The diameter would undergo linear expansion in all directions just like the length. All these years I've been doing it the hard way! Don

First of all, if you're concerned about the diameter, make sure you're using the VOLUMETRIC coefficient and formula, not the linear one. Calculate the expansion of the inner cylinder first. Then calculate what the thickness change would be for the outer "hoop" by calculating the change in...

You can use any pitch you want. It depends on your application. For a non-standard, unified thread you can calculate the appropriate dimensions using the chart in the Machinery's Handbook. To designate the thread on a drawing you give the major diameter followed by the tpi, the class, and...

Steve wrote: "Oops, I sound like I'm goading. I'm not. I'm just interested. As I mentioned before, the idea that Volts*Amperes gives the same (W) as N*m/s thrilled me as a kid." I wasn't trying to say that the Metric System isn't superior in some ways. I'm only saying that it's overrated...

The imperial system is based on feet, slugs and seconds. Force is a derived unit, just like in metric, and is in pounds. Using pounds-mass is as stupid as using kilogram-force (which you do see sometimes). As long as you use slugs for mass you can use all the same, simple mechanics formulas...

You need a profilometer. Don Kansas City

"I never heard of a slug in thermodynamics, it was all in lbm or kg. I've seen that in a few old books, but never used in school. I think it went out of style along with dynes, poises, etc. Unlike kg-f, bars, calories, and other non-SI units which I still see." "lbm" are strictly...

I started learning the metric system in fifth grade (1974). It has been shoved down my throat my entire life. I know it forwards and backwards and so do all the engineers I have ever worked with (I have been in industry for 22 years). I can think in metric all I want. When I estimate the...

Interpolate. Don Kansas City

Contrary to what most of the world seems to believe, the United States is not "non-metric". We are both metric and imperial equally. Any American engineer under the age of about 60 is utterly bilingual with regard to measurement systems. You can get virtually any metric part you want here...

Can you link it with another pinion that is already on the rack (like with a timing belt) and synchronize it? Don Kansas City

You see them specified from time to time. I personally always jump from 10-24 to 1/4-20. I also jump from 3/8 to 1/2, skipping 7/16, but that's just me. In the old-timey times there used to be a #14 machine screw as well, but I haven't seen one of those for a long time. Don Kansas City

1095 was probably a pretty good choice. Did you temper after hardening? Don Kansas City

Sounds like you need to administer regular beatings to your assemblers. Don Kansas City

Direct solenoid or poppet/pilot spool? Don Kansas City