Printed reproducer for old Victrola

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Printed reproducer for old Victrola

Postby MartyS » 2019-Mar-Mon-19-Mar

Just for fun I tried designing and printing a reproducer for my Victrola, worked much better than I thought it would.

Not sure if embedding is possible here so here's a youtube link to 30 seconds of it playing a record.

https://youtu.be/_-UfqZc5rBA
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Printed reproducer for old Victrola

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Re: Printed reproducer for old Victrola

Postby olendorf » 2019-Mar-Tue-05-Mar

That's crazy. Old tech meets new tech. Can't believe it works. Sounds pretty good too.
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Re: Printed reproducer for old Victrola

Postby RetireeJay » 2019-Mar-Tue-12-Mar

That's amazing! Is there a metal needle that follows the groove in the record? Did you design this yourself or find the design somewhere?
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Re: Printed reproducer for old Victrola

Postby MartyS » 2019-Mar-Wed-10-Mar

RetireeJay wrote:That's amazing! Is there a metal needle that follows the groove in the record? Did you design this yourself or find the design somewhere?


I designed it myself in FreeCAD.

I used one of the regular metal needles used in the normal reproducer (I've got lots of them), designed a hole in the end of the arm and to make the needle tight I simply heated it and pushed it in, so it melted it's way into the hole and once cooled it is tight in there.

Printed in with PETG. It's in 2 halves, the diaphragm is .5 mm thick, the pivot point for the arm is .8 mm and I cut some of it away with a hobby blade to make it thinner.

It is about a centimeter larger in diameter than the normal reproducer.

I was expecting it to make sound, you can get sound with a dixie cup and a needle, but was amazed how clear and loud the sound was from this thing.
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Re: Printed reproducer for old Victrola

Postby MartyS » 2019-Mar-Wed-10-Mar

Here's a closeup picture:

Image
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Re: Printed reproducer for old Victrola

Postby RetireeJay » 2019-Mar-Wed-13-Mar

So the arm is printed as a "bridge" at the same time as the diaphragm and the rim all as one unit?
I looked at an online description of how to rebuild an original, and it had an unbelievable number of parts: mica diaphragm, gaskets, assembly screws, adjusting screws, even adjusting springs! And yours has two parts! Bravo! :geek:
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Printrbot Plus operational January 2013
Brass threaded rods (5/16" X 18) & nuts for Z axis
GT2 belts & pulleys
Cable chain to reduce probability of fatigue failure in wires
E3D V5 Hot End, 0.4mm nozzle, also 0.8 and 0.25 in use occasionally
PB fan mount + 40mm fan -- using printed mount adapter, not the E3D supplied fan
Injection molded extruder gears
Optical Z "endstop" (custom designed and built)
Have used many pounds of T-Glase filament. Now also doing some work with Ninjaflex SemiFlex
Print on glass with Scotch Craft Stick or other glue stick
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Re: Printed reproducer for old Victrola

Postby MartyS » 2019-Mar-Wed-15-Mar

RetireeJay wrote:So the arm is printed as a "bridge" at the same time as the diaphragm and the rim all as one unit?


Yes, there were a few lose strands that I had to trim off but overall for such a long bridge the PETG did well.

Diaphragm half slides into the half that connects to the swing arm. I put a little CA glue on it but probably didn't need to because it was a pretty tight fit.
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Re: Printed reproducer for old Victrola

Postby MartyS » 2019-Mar-Wed-15-Mar

Oh, and the original on my Victrola doesn't have mica, it's a metal foil diaphragm, but it does have a lot of parts, including very tiny ball bearings that fell out a few years ago as the rubber ring holding them in decayed, found a source for the bearings but it was a pain getting them in.
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