Apade Messages: 1 Registered: February 2022 Location: Germany
Love the design and the cooling method! I want to build up to four pieces of the 12Pi but since I am located in Germany, I am not able to get flat packs, the woofers or even the cooling parts from you (shipping would cost a thousand $ more than four times 12Pi Kit with cooling parts! ) so I will have to machine the parts myself...
I am a bit anxious about drilling the pole vent of the woofers, since I don't want to get metal to fall behind the dustcap and into the magnetic gap... Is there a trick to prevent metal from falling inside the woofer?
Is it possible to get the Plans from you and some more detailed drawings of the cooling plug? The drawings I got do not state the length of the upper (wider) part of the plug. Also 3d files of the cabinet and the cooling plug would be much appreciated so I can convert to *.dxf and give it to my local CNC guy!
As for machining the center pole, my suggestion is to purchase blown drivers and then recone them after the machining operations. That definitely works best, because you have access to the gap and can clean it out before installing the voice coil and cone.
When I made the first prototypes, I thought I could capture the metal filings with the magnet. That it does, but since the gap has the greatest intensity, that's where most of the filings are captured.
So I did as I'm describing to you - machining an empty basket and then reconing it. After that, I began to have OEM runs made of the drivers, where the center pole was machined at the factory prior to installing the cone and final assembly. Either way is fine - machining new parts prior to final assembly or starting with bare baskets from blown drivers and reconing them afterwards - but trying to keep the shavings out of the gap with the voice coil installed just really doesn't work.