That state of metric conversion in the US

Nonlinear? how so?

You forgot about 30mm, 40mm and 50mm International tapers. Ubiquitous on CNC machines. Better for automatic tool changing.

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"10E8" is ambiguous. Some people think this is 1e8, and some people think it's

10^8 = 1E8 10E8

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and in engineering format the exponent should generally be multiples of three

-Lasse

Good Lord, you're dense. Who the f*ck cares what Europeons *call* anything?

You don't get out much, obviously. Just a small sampling of *one* variety of connector (in inch sizes) from DigiKey:

It's impressive how quickly we become famous.

Most (if not all) PCB layout programs have a function which snaps to the centre of the pads when routing a trace. So different pitches are no issue at all when routing a board. If it is, its time to look for the 'snap to pin' function and switch it on or upgrade the PCB package.

I'm not in or from the US. I just conform to what is easy to use. I've encountered a lot of people insisting on using A4 sheets in Orcad. I have to duck when I say I just check 'fit to paper size' before printing and use the default sheets. There is a nasty bug in Orcad when using A4 paper sizes BTW.

Been there... I recently submitted a design which got turned down. The annular ring around a hole was 0.124mm instead of 0.125mm.

In the future, everyone will be world-famous for 15 milliseconds.

-- S. Pefhany aka anon

Best regards, Spehro Pefhany

Indeed, we got them from there, and they got them from India. Ours don't look much like theirs, and theirs don't look much like the indian ones.

The Arabic charcters on the right are numerals.

having encountered them before, I did.

Yes, the lag time is about the same as the duration... 15 minutes.

Yes, but it doesn't apply to circuit board which is where I care about the speed of light mostly. Instead it is around 200 mm per ns depending on your board construction.

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Tell that to the spreadsheet people! I recently found that you can make engineering notation work in spreadsheets, both Excel and Open Office. But it is not built in and it quite a trick getting it to work.

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You're right, it seems I tried to be smarter than I am, thanks for pointing this out.

Regards, Mikko

NO! Pozidrive flutes are constant-width. Philips are tapered, and that means only a small contact area between Pozi driver and Philips fastener- you'll deform something. JIS (Japanese) is a completely different series. So is "Reed and Prince" (aka "Frearson"), except there's only one Reed and Prince size/shape driver.

A dot on the screw head indicates JIS Four hash marks on the head indicates Pozidrive.

Pozidrive #1, #2 and Philips #00, #0, #1, #2, #3 are relatively common, and NONE of them is a substitute for any other. Unless you have an emergency do NOT mix drivers.

rule!

No, Uwe had a good mental shortcut for converting fractional inches to mm--multiply 1/16ths by 16, divide by 10. The result is high by .8%, but easy to compute.

Example: 13/16" (20.64mm). 13x16=208, divided by 10 ~= 20.8mm. Example: 1/4" (6.35mm) = 4/16ths. 4x16 = 64, divided by 10 = ~6.4mm.

It works because 256 is just 2 more than the exact conversion factor, which is 254. If the number's in 1/16ths, they've already done half the work.

Thanks Uwe.

PADS has the "complete" operation, which does a decent job of finishing a route if you were kinda close anyhow.

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Normalized scientific notation has the coefficient between 1 and

We usually whiteboard in engineering form, but use n and u and such for the exponent. One quickly learns to multiply and divide these, as in n over m is p. It's a game here to do math in one's head, on the fly; you lose points for pulling out a calculator or a phone.