New Speaker Construction

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#45
Timn8ter said:


Raka,
Is that David or Igor?
Click to expand...


I don't know, I'm not so close to ask him😀
Seriously, David, of course.

Antiresonant,
Thanks for your comments, but a reflex port isn't such a bad animal, it just have it's limitations like any woman.
At first the design was a TL, but as this is a friend order, his compromises are different than mine, and space was not infinite.
jewilson,
yes, it took three circunferences each side to achieve this shape. Internally has the same shape, and yes, it took a LOT of time to route the laminates, my router is still crying trying to understand the punishment.
Contrary to a common belief, the varnish is applied not in thin layers, sanded lightly, and so on. It's splitted in excess, and after dried (you can expect a LOT of time for this to happen), you sand it, and get ah homogeneus finish that I like a lot, like real furniture.
The veneer is mukaly, that is sold like a cheap alternative to cherry, which I like a lot.
Do you have the bessel formula at hand?
Andy,
I have much more pictures, tell me if you really want them. What is translam?
Rich,
This speaker has very "smart" compromises, that includes not very low response, modest 50Hz (15lts is the internal volume), but without eq. I think I managed to take care of baffle step, room gain, and medium sensivity (90?). The info about the complete design will be ready as soon as the filter, biamped of course, is ready with measurements pictures.

What's conehead?

PS. I hear some vibrato here, are you Igor? Hey, I recognized your vibrato, how's your Viexteumps doing?
 
#46
To those who recommended a wide-belt sander/drum sander, you can only sand flat surfaces, and both sides have to be parallel. You could get them parallel with a jig, but then you can only sand flat. Most shops would probably be pretty iffy about running something through that requires a jig, as if if it twists or turns you could easily enough tear the sandingbelt(About $50 for a 37") or tear the feed belt(lots of money). You'd be better off using a upright stroke sander, although most of them don't get much wider then 6". Probably glue up your pieces that side, stroke sand each one, then glue up the rest of the pieces and use a belt sander. We've got a 1"x47" belt vertical belt sander that would probably work too, that has a fairly long sanding surface.
 
#47
this is conehead

Tapered quarterwave pipe, made up with 100 rings of 18mm mdf.
 

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#48
100 rings?

Are you crazy?

If you are serious, then I think I can give you an advice:
Make provisions for two guiding holes, and use them with two long rods, just for aligning purposes. This method is used for manufacturing the stator lamitation in electrical machinery. Basically is like using your finger to support two donnuts!!
 
#49
Or if you have access to a large enough lathe, you could turn a center pole and simply stack your MDF slices on top of it(since you don't seem to have any center braces. I'd think that'd work fairly well for aligning them.
 
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