Bobbin manufacture

[RedHouse]

...The bullshit trains pulls into the station here regularly....

Ah yeah the BS-Express!.

I didn't make the connection to the SD videos IIRC it was something about a "sour smell".

[Possum]

...

I wasn't kidding, well about needing the smell to get the tone, but butryate has a very distinctive smell, if you have any old TTops put yer nose up to that plastic and take a whiff. Its a unique odor and especially on new butryate is really noticeable. Some screw driver handles, the clear yellow stuff is the same material. Duncans smell really good :-) Old P90 dog ear covers were made of the same stuff and humbuckers rings too, its a pretty flexible material. I seem to remember that smell from my childhood, probably alot of toys back then were made with the stuff. Barbie smelled REALLY good, he he....
I'm sorry to report that Nitewinder has patented the scratch'n sniff bobbins a couple years ago, with eau 'd smelly socks limited edition series stunbuckers. He beat D'Marzio to it by days, but they will wait til his patent runs out and then grab it. No one though, has yet patented "double bananna" smelling bobbins. I've also heard that if you mismatch the smells by 30% it really opens up the tone, but you have to use the dominant smell on the screw bobbin :-) You can easily lose the delecate tones by going too far and using scented potting wax, so don't do it, no way....

[kevinT]

heeheeheehee


At least I hold the patent on winding with spaghetti.

[David Schwab]

WTF?

Butyrate is commonly used for artificial pineapple and other fruit scents.

It's an organic compound.

[David Schwab]

Barbie smelled REALLY good, he he....

Yes! I remember that smell too. I used to take a good sniff of some of my toys.

Some vinyls have an interesting smell as well.

I'm sorry to report that Nitewinder has patented the scratch'n sniff bobbins a couple years ago, with eau 'd smelly socks limited edition series stunbuckers. He beat D'Marzio to it by days, but they will wait til his patent runs out and then grab it.

No, they will just pull a stunt like they did with Kinman, and file a patent with one small detail changed anyway.

[ShannonH]

That would be cool if you could.[/IMG]

I still haven't heard from that guy, sorry. I bet you could find someone to do them, Although maybe not from the plastics you want. I know a guy that did his in two parts on a CNC and then glued the bobbins together. They still sounded good.

Shannon

[David Schwab]

I know a guy that did his in two parts on a CNC and then glued the bobbins together.

You can even do a silicone rubber mold and mold them that way.

[R.G.]

It shouldn't be all that tough to make a hermaphroditic half-bobbin that could be lost-wax reproduced into soft mold tooling for cast urethanes, then superglued into a single bobbin as needed. Should be good for the 10 to 1000 units range.

There's a local place that specializes in cast urethanes that I watched make pot-core bobbins for ferrite cores that way.

[ShannonH]

cnc options

I was thinking, if you have a computer, you can get the mechanicals and beginning software for a ShopBot cnc router for about $7K. this is for a 24x32 table. I'd love to get my hands on one, but the timing isn't right. Seems to me a better option for small runs of pickups, and can also be used to rout bodies, necks, etc.

Peace

[DoctorX]

mastercam, meshcam, and mach3 are pretty useful for things like this.

This book has plenty of ideas for short run tooling for injection molding.

http://www.morganindustriesinc.com/p...ding-guide.htm

Your results depend on how much work you put into making the mold. Besides sizing the mold to take into account the amount of shrinkage the piece will undergo once it cools, you have to be able to make holes in the cavity sized to fit the core and ejector pins, as well as make the side cores properly. This is a brief glimpse on why it costs so much to have an injection mold made. Even DiMarzio used to have his first pickup bobbins made by hand back in the early 70's before he ponied up the cash for a mold.

Doctor X

[belwar]

Mastercam is a great program. I've been programming in it since 1996. Version 5 on a 486 computer with a "Turbo" button. It's come a long way thats for sure. Im currently running X3 Mill Level 3 and want to upgrade to the Solidworks package.

[rhoads]

If Im going to run with some CNC bobbins, what would be the preferred type of plastic? Ive visited a few companies who can do the work, but the list of plastics they recommended was different each time.
Knowing virtually nothing about plastics, Im not sure which type to choose.

Thoughts?

[DoctorX]

Nylon 6/6 and ABS (cycolac)....

don't forget to take into account shrinkage rates of different plastics when designing molds (among other things). See earlier post regarding the book from Morgan Industries.

[salvarsan]

Butyrate is commonly used for artificial pineapple and other fruit scents.

It's an organic compound.

Careful with that ester, Eugene.

Not all butyrates are butyrate plastic.

Butyric acid smells like vomit.

The butyrate esters of ethanol and n-pentanol alcohols form the primary scent
notes in pineapple and apricot odorants. They are small molecules that can
volatize and stimulate the nose.

"Butyrate plastic" == cellulose acetate butyrate, a polymer
that is too heavy to vaporize and generate a smell, although
its slow decomposition disproportionates out acetic and butyric acids.

Most polymers have no aroma, but the monomer feedstock,
the polymerization catalyst, and the mold release agents are
often plenty stinky.

-drh

[Bruce Johnson]

I make all of my bobbins by casting them out of polyurethane casting resin, in silicone molds. You machine up a master out of aluminum (or hard plastic) and make up as many silicone molds from the master as you want. With a row of molds, making up a batch of parts is surprisingly quick. The resin takes only about 10 minutes to cure.

If you haven't found a solution/supplier yet and don't want to do them yourself, I could quote you on making these parts for you.

xstrange@earthlink.net