M2 Makeover

[jimc]

actually i didnt even model it. that was a design i got off thingiverse. there are just tons of them on there. i did see ones without bolts but everything was really flimsy. of all the cases i found for the pi2 i did like this the best. i will end up mounting it to the m2 somewhere. it fits really well down low on the frame under the x stepper.

[rsilvers]

I made my Pi case with my laser cutter and acrylic sheet. There were so many to choose from, it was hard to narrow it down.

[jimc]

ill have to remember you have that. i have the lenses for my generator gauges laser cut from some guy all the way in colorado. they are only 1/16" acrylic discs.

first print on the new machine. i got all 3 m2's goin at the same time.


https://youtu.be/GJnMTZjhLsQ

[Dale Reed]

jimc, have you ever seen the YouTube video with the floppy drives the Imperial March from Star Wars? (search: Imperial March of the Floppies) I'd love to see AND HEAR those three printing MG bracelets in 3-part harmony ---
Da-da-daaaa-de-Da-de-daaaaaa!

Seriously, I want a slicer and/or a part optimized for musical printing.

Back way early in my career, I took a PLC Motion class, and we had a stepper module for positioning on a little ugly drill machine. Maximum step output on the module was 1000 Hz. I got out my calculator and popped in the 12th root of two and calculated the nearest to integer Hz equal-tempered scale notes for an octave or two, assuming 1000 Hz as "A" a couple octaves up from middle C (nominally 880 Hz), and wrote a positioning program that played the first few bars of Toccata and Fugue in D minor (BWV 565, not the Dorian).

The instructor demanded that I give him a tape (yes, it was 3M magtape cartridges like the HP-85 used) of the code.

The movesets we were doing in class were only half a dozen moves and fit in one data block. I had to figure out the code to sequence the data blocks for a longer moveset for that many notes. Ostensibly, that's what the instructor wanted the code for.

Dale

[jimc]

on thingiverse there is a model that when printed it plays capt picard's song he plays the flute to in one of the episodes of star trek tng.

[pyronaught]

wrote a positioning program that played the first few bars of Toccata and Fugue in D minor (BWV 565, not the Dorian).

Now there's someone who knows his Bach. I'm guessing it was the Toccata you were playing, as you'd need more than one motor to do counterpoint for the fugue.

In most cases the PWM frequencies used to control motor speed intentionally avoid frequencies in the hearing range so that people don't have to listen to their appliances make music. Sometimes you can't avoid it though, such as with the stepper motors used in CNC and 3D printing. I saw some video of a CNC router playing Christmas tunes once.

[lem]

In the "old days" we did this type of thing by placing an AM radio near the CPU of a computer. Amazing what tunes you can play. More amazing than that was that you could tell if your program was running normally by the sounds it would make on the radio. Certainly not as good as a debugger, but you could tell when things were going badly.

[Dale Reed]

Remember when PCs ran at 100 MHz? I always wanted to FM the clock on one with a stereo multiplex generator output so I could listen to Hi-Fi FM stereo music on my FM Walkman (remember those?) around the house while the computer was running. Some PCs actually do use pseudo-random spread-spectrum frequency shifts on the clocks so they can meet FCC Part 15 class B emissions requirements by not having all the interfering energy on one frequency. And I apologize to the OP for de-railing this thread. My bad.

[rsilvers]

I am so glad that broadcast radio is dead. Hearing songs I don't always like with commercial breaks was terrible.

[pyronaught]

Remember when there were no hard drives and you had to load the operating system off a 5" floppy (the old ones that actually WERE floppy) every time you turned on your computer? If I remember right, the RAM on an Apple II computer was something like 256K, and it had to hold the OS AND your program! Those were the days when programmers had to write lean & mean code where every byte mattered.