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-   -   Open source Waveguides for CNC & 3D printing! (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing.html)

aczern 27th August 2018 05:25 PM

Could you design a waveguide with the round mouth 104mm diameter for SB21SDC?

augerpro 27th August 2018 08:51 PM

No. But I will be doing an elliptical @ 4.25" wide.

next667 28th August 2018 08:49 PM

Watching with interest, and hoping for a group buy.
BTW, thanks for geting me back into 3d CAD :) - As a proud sb26stac owner, I'm hoping to edit 5" WG file just to keep the eliptical inner WG shell, and add a rectangular face to it for easier mounting onto baffle.
Also, fingers crossed for a satori 6.5" WG to match with bigger satori midrange driver. Coupled with ferrite tw29 I'm looking at a world class 1st order elliptical xo.

augerpro 28th August 2018 11:55 PM

The Satori dimple dome didn't play well with the waveguides at all. Combined with how large the combined dome and surround is, I don't have a lot of hope they will ever work well.

The SB26STAC will probably measure pretty good though.

next667 30th August 2018 03:28 PM

Is it purely the size, or is off axis more important?
Because, new Satori dome is holding it up a bit better off axis, and any Wg that makes it to 15khz is fine by me. Satori is a wonderful dome that begs for constant directivity WG imho. Lets not forget Be dome ($$$)...

edit: new sb26 ceramic dome is very very nice

Mawes 30th August 2018 10:56 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5527993.html#post5527993)
One option I considered early on was to mill two scallops into the waveguide wall. Then design the phase shield separately that had matching ends so it could be keyed to the waveguide in perfect alignment. That way you CNC the waveguide, but have a high quality print done of the phase shield.

Sounds like a good way to do it. Alot faster and cheaper.

augerpro 1st September 2018 04:25 PM

Quote:

Originally Posted by next667 (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5531345.html#post5531345)
Is it purely the size, or is off axis more important?
Because, new Satori dome is holding it up a bit better off axis, and any Wg that makes it to 15khz is fine by me. Satori is a wonderful dome that begs for constant directivity WG imho. Lets not forget Be dome ($$$)...

edit: new sb26 ceramic dome is very very nice

The size of the throat is the main problem. Look at the SB29 results above. It has identical dimensions of the surround and dome as the Be Satori's. OTOH the metal dome will behave slightly different than the fabric SB29, but given what I've seen so far I doubt that will be an improvement. I think SB has a SB26 made with Be, but I don't know if it was ever going to filter into the DIY world.

ScottG 1st September 2018 07:52 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5529623.html#post5529623)
The Satori dimple dome didn't play well with the waveguides at all. Combined with how large the combined dome and surround is, I don't have a lot of hope they will ever work well.

..from Zaph's (near the bottom of the page):

Zaph|Audio

SB29RDCN (..dimple dome)

no waveguide:

http://www.zaphaudio.com/temp/SBAcou...30-offaxis.gif

vs. 8" round waveguide:

http://www.zaphaudio.com/temp/SB29RD...5-30-45-60.gif

"Not too bad, though there are some response artifacts on the top end. The waveguide was modified in the same way as the version in the waveguide TMM system on this site. The dimple dome has a bit wider surround than the 27TDFC and the waveguide sits slightly over the edge surround, though not touching it. I suspect that the response artifacts are more related to the waveguide profile near the dome and the unique radiating surface

..The SB29's unique radiating surface mates well to the 8" PE waveguide, much like the 10". The response is smooth and controlled over most of the range, with only a small response issue at the top of the top octave, and then only on axis. I wanted to better describe the fitup. First the opening is actually 1.610", not the 1.5" I previously mentioned. The SB29 neo's flange raises the plastic waveguide edge over just over the outside surround edge and it clears contact by about 1/32" all the way around. The small neo flange is not removeable and so this kind of fitup is pretty much required. I did inspect the large non-neo SB29 for fitup with it's faceplate unscrewed and removed. For those who wish to try this, the opening will need to be cut to 1.750" to clear the surround and press against the plastic dome mount. No guarentees if that arrangement will work as well, but I'd like to see someone give it a shot. (if I don't myself) "

ScottG 1st September 2018 07:56 PM

-note that I'm NOT advocating the dimple dome - I prefer the dome tweeters.

ScottG 1st September 2018 08:05 PM

Quote:

Originally Posted by augerpro (https://www.diyaudio.com/forums/multi-way/318190-source-waveguides-cnc-3d-printing-post5527993.html#post5527993)
One option I considered early on was to mill two scallops into the waveguide wall. Then design the phase shield separately that had matching ends so it could be keyed to the waveguide in perfect alignment. That way you CNC the waveguide, but have a high quality print done of the phase shield.

I think printing the phase-shield is a good idea, but then setting it in a "quick-release" silicone form and using a pour-in filler for the rest of the waveguide. ;)

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