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Introducing the 3D printed Shot Puck-- Model One-- record weight.. $37.50 usd plus ship.




above:  cad screen shots of the concept for Model One.  3-D printers  work from a 3-D cad file in .stl format, like the one I've prepared above.

DSC_3196.jpg (339170 bytes) Left: the 3D printed ShotPuck model one with textured matte black enamel coating. (hint: click on thumbnail image to view full size)

The ShotPuck Model One is a record weight that features 5 chambers loaded with #9 lead shot.  In fact 76.3% of the ShotPuck's total mass is #9 lead shot.  Each chamber contains precisely 36.7grams of the shot. Total weight of the assembled record weight is 234.4 grams. (8.3 oz)   Below is the explanation for the concept of this record weight. 

sht 1 over-view.jpg (127033 bytes) Weights and dimensions (hint: click on thumbnail image to view full size)

What is the purpose of this record puck? (also known as a record weight)

Q: We might just as well ask the question; what is the point of any record weight?*

A: to dampen vibrations running through the record as it is being played.

Q: why lead shot chambers?

A: Very much like a sand box, the individual lead shot vibrate against one another when stimulated by an external source of vibration.  This implies that the individual shot act as a conduit through which vibrations travel.  However, because the individual shot are in intimate contact with a large mass of shot, there is not enough energy coming from the source stimulant to force the vibrations to pass completely through the chamber.  Ergo vibrations go in, they are dissipated and die within the shot chamber.  When this theory is executed properly within a record puck, the end effect is that the reduction in record vibrations result in a cleaner sounding playback.  This should also result in a measurable improvement in the s/n ratio.

*(Record weights are often nick-named a 'puck'. because the size and shape often resembles a hockey puck)


Other notes: 

Printed material: ABS resin.

Print time for the main body of Shot Puck Model 1: 9 hrs, 36 min.  Add to that another 1.5 hours to print out 5 chamber caps.  Then include an hour to remove the bed adhesion layers and deburr.  The main body requires a machining operation to produce a precisely round, and to a particular size,  spindle bushing bore.  The bushing itself is made from Delrin, lathe-turned and then is pressed into the main body with .003" of interference for a permanent fit.  (the bushing OD is .003" larger in diameter than the bore it presses into)  Total manufacturing time: 3 days including post paint drying time.

Caution: contains lead shot

Available finishes: textured black enamel on remaining inventory.  Other finishes might be custom ordered

email Contact: webmaster@theanalogdept.com 


Price is $37.50 usd plus shipping and supplies; usps priority mail medium flat rate box: $15.50 usd -- conus.  

Paypal, Money order, cash (if local pickup)

I can answer any of your inquiries via email here: webmaster@theanalogdept.com

Thanks for your interest.



Below: more detail photos and text

DSC_3180.jpg (344228 bytes)  Left: Freshly printed with bed adhesion layers intact.. (hint: click on thumbnail to view image full size)  Btw, this print took 9 hrs, 36 minutes to complete.

After printing the printed part requires some hand work in the form of removal of any and all bed adhesion layers, any misc. support structures, and deburr.

DSC_3177.jpg (240026 bytes) Each of the 5 chambers holds 36.7grams  of #9 lead shot.  (carefully measured to ensure balance)

DSC_3196.jpg (339170 bytes) with caps glued in place and then painted with matte black enamel.

DSC_3197.jpg (227339 bytes) From the bottom.  Finished puck with its lathe-turned Delrin spindle bushing pressed in.  Foot pads are silicone foam - 2mm thick.  (glued in place)

DSC_3198.jpg (232866 bytes) total wt: 234.4grams

Total assembled weight: 234.4 grams.  Btw, without the 183.5 grams of shot,  the puck shell and its chamber caps - plus foam foot pads, weigh a mere 50.9 grams.  Another way to look at it;  78.3% of the assembled mass is #9 lead shot.

DSC_3194.jpg (187720 bytes) another view

and at work.

Thanks for looking!