h a l f b a k e r y
add, search, annotate, link, view, overview, recent, by name, random
news, help, about, links, report a problem
or get an account
The record would be parabola shaped. To cut it, a
pendulum with a cutting needle would be set to swinging
by releasing it from a position that exactly matches the
release point on the player. It would go through the
swinging patterns creating beautiful curves and patterns
vibrating cutting needle imparted audio
information to those patterns into this soft master disk.
Once the master is created, much harder playable
are cast from this. The record player has an exactly
matching pendulum that's released from the exact same
point as the cutting lathe so that it will approximate the
lissajous pattern in its progression through the recording
with slight deviations being corrected by virtue of it
following the physical guide of the record notch.
Various patterns could be chosen as well by releasing the
pendulum on lathe and player from different points with
different approach angles. 4 or 5 choices would be
available and the correct position would be marked on
record, although you'd quickly learn to recognize which
pattern was cut into the record you're about to play.
Clearly very soothing music that would compliment the
motion of the player would be a natural choice.
A more practical idea might be to adapt those swirly
drawing contraptions like the one we played with as kids
to a record player. Note, I believe the issue of
interference with the path by having it constantly cross
cut by subsequent passes would be to a large part due to
the trajectory of the swinging player element but you
might have to have the cut go continuously deeper from
start to finish and the player pendulum similarly extend
the needle deeper as it plays.
NOTE: This is one of those ideas that changed after
writing it but I don't feel like going back and changing it.
Have the machine in the first link be adapted rather
than pendulum which has some issues. Although the
pendulum would be relaxing to watch.
Ok, either of these approaches would work.
Swirly needle path record player.
[doctorremulac3, Sep 30 2019]
Orginal idea that I think would be better served with the machine above.
[doctorremulac3, Sep 30 2019]
YouTube: Anita Chowdry's "Iron Genie" harmonograph
Mentioned in my anno. A better-produced video, but doesn't show technical details. [notexactly, Oct 01 2019]
YouTube: Gavin Greenaway's homemade harmonograph
Mentioned in my anno. The video is just as homemade as the machine, but it shows lots of technical details and paths. [notexactly, Oct 01 2019]
YouTube: David Vernon Williamson's attempts to get consistent drawings from a harmonograph
Mentioned in my anno. No two drawings quite the same, even with careful control of the conditions. [notexactly, Oct 01 2019]
YouTube: Alfred Hoehn's pantograph-type drawing machine
Mentioned in my anno. I don't know if this type has a proper name, but I've seen it called a harmonograph too. (I've also seen it referred to as a type of guilloché machine, but I don't think it's ever actually been used for that). [notexactly, Oct 01 2019]
YouTube: Francisco Nieva's (?) pantograph-type drawing machine
Mentioned in my anno. This one has multiple pens tracing different paths simultaneously, which could be interesting musically. It also has an epicyclic drive mechanism for the pantograph. [notexactly, Oct 01 2019]
||Doesn't a pendulum swing through a spherical surface, not a paraboloidal one, unless its
cord is restricted by some kind of curvedly tapered tube?
||I think a non-contact storage/reading method (optical, magnetic, capacitive?) might be
more appropriate for this, because, that way, there's no risk of the needle taking the wrong
path when the tracks overlap and then diverge again. The risk of that is a lot less with the
Spirograph-like mechanism (which I what I think you're referring to in the last substantive
paragraph), because the mechanism enforces a particular path for the needle. With such a
mechanism, though, each record would be limited to playing back only the tracks recorded,
and it would have to be supplied with the settings for the geometry of the player. On the
other hand, with the pendulum, assuming non-contact reading, the head could be allowed
to roam freely over the record, as a pendulum does, and it would produce sounds based on
whatever it passed over. Then there would be an art to composing records that would
produce interesting sounds in that way, and there would also be an art to setting the
pendulum swinging on a given recordalmost like a form of DJing. Also, if you left it
swinging for an hour or so, the sound output would also depend noticeably on your latitude.
||Wowwww. You could record music by having a little
transducer driving a cutting needle in a Spirograph pen on a
piece of vinyl.
||//risk of the needle taking the wrong path when
the tracks overlap and then diverge again.//
||That's why I opted for the spirograph version
halfway through the idea. The mechinism leads the
way, not the groove itself.
||If I had a spare couple of tens of thousands I could
throw away on a weekend project I would create
and market these. Annual unit sales would be
to be in the hundreds if not dozens, but that
wouldn't be the point.
||It would be like my hero the guy who was
instrumental in the design of two of my favorite
things, the A-10 Warthog and the F-16 Fighting
Falcon. He owns a Jazz record label now. He said
he licenced something to JayZ for a hit song and
that pays for all his other jazz albums that lose
money. This guy is about as close to a god as you
can get without wearing sandals and having a
||//non-contact// definitely. Friction would not be your
friend in this.
//mechanism leads the way// the 2D pendulum is "the
mechanism" leading the way too. Heavy weight, good
(magnetic repulsion?) bearings at the top.
//extend the needle deeper// I think lowering the whole
mechanism from the top would be easier, and keeps the
geometry of the pendulum precisely constant (but not
needed if you go non-contact...).
(Re: the cycloid drawing machine; many years ago I wrote
a Q-BASIC program that did the same thing, only better.)
||As an alternative to a Foucault-esque pendulum, I suggest
looking at harmonographs: [links]. That way, the pattern can
be more complex and, more importantly, you can use a
planar record while keeping the head in contact/proximity.
||// pendulum [
] good (magnetic repulsion?) bearings at the
||I suggest a knife-edge gimbal. Maglev requires active control,
and will impart vibration to the pendulum.
||As an alternative, there are also pantograph-style drawing
machines: [links]. That mechanism seems like it would produce
a more repeatable pattern, as long as the two cranks were
geared together and driven by the same motor.
A couple of repelling permanent magnets; no activity
||Take it up with Earnshaw.
||(Quick googling)... Hmm; you learn something every day.
(On the other hand, how did I not know about Earnshaw
||//(On the other hand, how did I not know about Earnshaw already?)//
||You had a fever that day and Steven Cooper, who was supposed to be taking notes for you, used his hall pass to skip the last quarter of that class to chat up Melanie Slatinger and you never got the info.
||Next question please, or if you would be so kind as to pay the receptionist on your way back... and thank you for visiting the Deuxfrites metaphysical Akashic recording studio and Ideaological emporium.
Have a nice day.
||//Deuxfrites metaphysical Akashic recording studio and
I would ask for a business card, but I don't think all that will
FIT on a business card.