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Joined 1 year ago
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Cake day: June 8th, 2023

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  • Yes but my measuring tape actually has 32nds on it. The meter side only has whole divisions, not tenth graduations.

    So the sae “ridiculous fraction” is a measurement I can easily make with tools I have on hand to the tools own limit of precision and double check in my head with five seconds of fifth grade level mathematics while the metric one can’t be actually measured without a set of calipers and honestly would merit long division or a calculator to double check and still needs rounding off a vile eighth of millimeter to hit what is in your own words “a practical number of significant figures”.

    Imma throw something out there and I hope the earnest admission that I can’t divide 752.5 by four in my head with the level of confidence required to cut materials by is enough to recognize it not as an attack but as a real grasp at understanding:

    People who make posts like yours either don’t measure things in any meaningful way (cutting, dividing, scribing lines, etc) or don’t know how to work with fractions.

    Like I said: it’s not an attack, I just can’t see how someone would suggest that the metric equivalent to 13/32 is easier to work with unless they didn’t intend to actually measure it or couldn’t do fractions.


  • i’ve worked in a few factories and this is not always true, especially with short runs.

    to make a machine assemble a thousand things you gotta “tool up”. that used to mean designing and building the tool that would do the repetitive motion but nowadays its just as much laying out gcode as it is figuring out how to make the more generalized machinery perform the specific tasks required for putting together some thing.

    so take a computer mouse, there’s like four parts. a usb wire, a circuit board, the bottom and the top. assembling the mouse is plugging the wire into the circuit board, aligning the board to the standoffs in either the top or bottom and make sure the wire is going out the hole then snap the top or bottom to it’s counterpart then test.

    probably fifteen seconds from parts to tested and ready for packing?

    so in a thousand unit run you’re looking at four and a quarter hours of human work. lets go ahead and round up to five, since someone is gonna have to set up our mouse assemblers bench, write out instructions, unpack the parts and dump them into bins, etc. it won’t be 45 minutes of work, but more slop is better!

    so for a thousand unit run you could pay your mouse assembler $15/hr and still only have 7.5c unit cost of assembly.

    packing is another one that often gets done by people, but a mouse is pretty much wrap, tie, bag, box. maybe another fifteen seconds of labor, so add 7.5c onto your assembly and youre looking pretty good.

    now your contract factory isn’t gonna quote you what they think they can hit, they’re gonna drag their laziest, slowest worker over to do the process five times, take the average and quote that. then they can charge you for ten hours when it only took five and pocket the difference. even then 30c per unit is most likely less than the robot equivalent.

    just the cost of a quote to tool up for that run is maybe $50? free quotes weren’t the norm domestically back in the day, but they were becoming more common overseas. then you’ve got the cost of the tooling (we’ll keep ip like part layouts and gcode here) and the machine time itself!

    there’s also the actual injection molding of the top and bottom, making the cord, assembling the board, etc, but thats a whole nother conversation!





  • Ehh, all those 1” tape machines are 8-tracks and designed for editing, not playback. Magnetic tape fidelity has a lot more to do with medium, bias and processing than the width of the tape itself.

    Hell, plenty of analog shops use four and eight track machines that run 1/4” tape!

    Compact cassette also has the potential to sound very good. If you would like a demonstration, look up the vwestlife yt channel or listen to a good tape on a good tape deck.