Announcement

Collapse
No announcement yet.

3D printed waveguides

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

  • augerpro
    replied
    Bliesma T34B fans, rejoice! Here are the results of two 6.5" waveguides. One has a circular mouth and the other elliptical. Now that I have a basis for further designs, I'll be doing a 8" and maybe 7.25". You can download the files here: https://www.somasonus.net/bliesma-t34b


    Leave a comment:


  • augerpro
    replied
    FYI, I ended up going with .stl over 3mf. When I tested a couple vendors, some don't recognize 3mf yet. This is a bummer because 3mf allowed including the engineering units in the file, so there would be no more confusion over metric vs standard. Also, weird internal faces throwing errors were supposed to be reduced because 3mf has a better storage format. Oh well.




    On an upnote, wow have prices come down for printing! i.materialise.com quoted me $25 for nylon SLS (my favorite) on one of my 5" waveguides! Now I just have to understand their finishing options, I'm not sure you can "polish" SLS, at least without removing a lot of material.

    Leave a comment:


  • augerpro
    replied
    I've finally added router templates for elliptical waveguides to my website! You'll need 5/16" OD and 1" OD template guide bushings to use them. There are holes that will accept #4 sheetmetal screws, or you can use a finish nailer, or double-sided tape to attach them. https://www.somasonus.net/waveguides

    Leave a comment:


  • jhollander
    replied
    I like the blue tape on both pieces with CA glue in between. Small marks at the bottom of the template hole makes it easier to align the template. The router bushing rides higher than the marks or rides over any indentations.

    Leave a comment:


  • PWR RYD
    replied
    I'd rotate the SB woofer 90 degrees counter-clockwise

    Leave a comment:


  • a4eaudio
    replied
    Do a search for blue tape and super glue method or blue tape and CA glue method.
    Also, maybe try a different double sided tape. The most recent stuff i got from Menards was way too sticky and would actually pull up the mdf. I settled on a compromise and used the blue tape with the overly sticky double sided tape in between.

    Leave a comment:


  • augerpro
    replied
    'm making a test cabinet to do some research on edges before I start final designs on a family of speakers. This gave me a chance tonight to try my routing template. Worked as expected, so I'll get them posted on the website soon. This will require changing all of the waveguides a bit, so if you are relying on using the routing template, I would hold off on downloading any waveguide files right now. You'll know when you can download them when the template files are available, and I always have a revision log at the top of every page where I note updates.



    I tried using double-sided tape to hold the template in place, but it didn't stick well. I ended up using a finish nailer to attach. I thought about integrating screw holes into the design, but I like that the finish nail leaves a tiny mark that is easy to fill. Any other ideas for attaching them before I do a final template design?





    Leave a comment:


  • augerpro
    replied
    Here are two more variants of the T34B waveguides, and a new Scanspeak R2904/7000 waveguide. I'll be adding the T34B designs to my website in a few weeks.









    Leave a comment:


  • The Oneness
    replied
    Originally posted by augerpro View Post
    Here are some measurements of the Bliesma T25A, to see how it measures on the waveguides I made for the T25B. The domes are very different, the A version is much taller. Clearly there is an issue here, which is disappointing.


    Ignore my comment on the post, wasn't sure how this forum works.

    Thanks for the reply the other day, missed that you had these posted. Thanks to everyone involved in these projects, massive help to us less knowledgeable/able diy'ers.

    Anyone think they would do decent firing straight back in a car? So I'd be approximately 30° off axis from the drivers side and 45° of axis form the passenger side. Perhaps the null between 0-10° may be beneficial since they would be in the sails panel area firing straight back at the door/window frame.

    Any plans to test the T25S-6? Have a pair I may be able/willing to loan out
    Last edited by The Oneness; 01-08-2022, 10:29 PM.

    Leave a comment:


  • The Oneness
    commented on 's reply
    Thanks for the reply the other day, missed that you had these posted. Thanks to everyone involved in these projects, massive help to us less knowledgeable/able diy'ers.

    Anyone think they would do decent firing straight back in a car? So I'd be approximately 45° off axis from the drivers side and 30° of axis form the passenger side. Perhaps the null between 0-10° may be beneficial since they would be in the sails panel area firing straight back at the door/window frame.

    Any plans to test the T25S-6? Have a pair I may be able/willing to loan out

  • TNA
    replied
    Originally posted by JRT View Post


    Have you tried any waveguides with planars/ribbons, and or AMT air motion transformers? Any thoughts as what type(s) of curvature(s) and throat angles might be appropriate?
    I've tried a few WGs with planar tweeters that provided adequate, but not outstanding results. I'm curious about others experience.

    Leave a comment:


  • augerpro
    replied
    I'd really like to get around working with AMTs. Just haven't had time. No idea what contour would work, but I think they might be able to be treated as plane wave sources, which makes design easier to model in something like ABEC. OS or conical would probably work well.

    Leave a comment:


  • JRT
    replied
    Originally posted by augerpro View Post
    So far, my best results are from hard domes. It's the soft domes that are tougher. However, after an early elliptical wall contour didn't measure well, I've stuck with a circular contour with constant radius. This has worked great for hard domes. When I see others post decent results with soft domes, it usually appears to be some sort of OS type contour. Along with my experience with hard domes, I've modeled some contours in ABEC (SB26ADC and T25B) and it has agreed with what I found: hard domes typically do better with a constant radius contour, and OS and conical were not that good. Wish I could do the same soft domes, but those are near impossible to model for a DIYer.

    Have you tried any waveguides with planars/ribbons, and or AMT air motion transformers? Any thoughts as what type(s) of curvature(s) and throat angles might be appropriate?

    Leave a comment:


  • augerpro
    replied
    Here are some measurements of the Bliesma T25A, to see how it measures on the waveguides I made for the T25B. The domes are very different, the A version is much taller. Clearly there is an issue here, which is disappointing.


    Leave a comment:


  • augerpro
    replied
    I removed the screen on the Peerless, and the faceplate on the Scanspeak.

    Leave a comment:

Working...
X