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  »  New  Vitavox’s S2 Survival Guide...  A typical convention......  Horn-Loaded Speakers Forum     124  1363726  07-16-2004
  »  New  Vitavox S2 with Electromagnets..  Cutter Head/Servo...  Horn-Loaded Speakers Forum     91  1072103  01-12-2006
  »  New  S2 Hissing Sound..  Cleaning Time Revisited......  Horn-Loaded Speakers Forum     12  114024  07-18-2006
  »  New  Vitavox S2 driver made in china..  What does it do right?...  Horn-Loaded Speakers Forum     36  286395  12-20-2006
  »  New  Phoenix..  Mute vitavox...  Horn-Loaded Speakers Forum     2  28140  03-20-2009
  »  New  Living Voice Loudspeaker..  A Polish Infomercial from Kevin Scott....  Horn-Loaded Speakers Forum     80  689904  08-09-2009
  »  New  French Horns/drivers shootout (oops! S2 came last)..  My bad...  Horn-Loaded Speakers Forum     7  74018  12-07-2010
12-20-2008 Post does not mapped to Knowledge Tree
decoud
United Kingdom
Posts 247
Joined on 03-01-2008
Post #: 1
Post ID: 9219
Reply to: 9219
Vitavox S2 coupling
fiogf49gjkf0d
I am constructing a set of 400 Hz resin-bonded sand horns and have been thinking about the best way of coupling the S2 to them. I can't find anything off the shelf that is 2.620 x 16 tpi, and none of the people with lathes I know have imperial kit to make a suitable threaded collar. I know Jessie had something made especially for his - presumably at high cost - but are there any other solutions?
12-20-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,160
Joined on 05-28-2004
Post #: 2
Post ID: 9221
Reply to: 9219
It is very easy.
fiogf49gjkf0d

decoud ,

If you wish you might use my method that I “invented” or my Fundamental Chanel. My MF Chanel horn uses a sophisticated harness with centering functionality but in but Fundamental Chanel uses a very simple “extended ring” method. It us chip, it would cost very little any machinist to do it. I think I paid $100 for a pair of rings. Lake the rings a half or 2/3 of the size of your S2 driver thread. All the rest is visible on the drawing belle. The only pain is to co-axis the horn and the driver… But wish you it to be the only pain you have.




The caT

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
12-20-2008 Post does not mapped to Knowledge Tree
RonyWeissman
Lyon, France
Posts 138
Joined on 05-29-2004
Post #: 3
Post ID: 9222
Reply to: 9221
Why spacers
fiogf49gjkf0d
Hi,  I did something like this but the ring that the S2 screws into is bolted directly onto the horn.  I can easily change this, is there a reason to have the space?

R Weissman
12-20-2008 Post does not mapped to Knowledge Tree
i_should_coco
UK
Posts 15
Joined on 08-25-2005
Post #: 4
Post ID: 9223
Reply to: 9219
Romy's solution
fiogf49gjkf0d
I had some adapters made, exactly like Romy's. I found a local engineering company in the UK (Slough) to do mine for me. The price was GBP240 for 8 pieces as some friends wanted some also.
12-20-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,160
Joined on 05-28-2004
Post #: 5
Post ID: 9224
Reply to: 9222
How to co-center it – here is the question.
fiogf49gjkf0d
The spacers are not necessary but I did not say how it shell be done but rather how I have done it. I question is how precise you would like to measure the S2 thread. The key is to press the drive to the body of the honor while you still have the threads lest. I personally found that to use a narrow ring and spacer is comfortable as I can see the end of the driver and how it touched the horn. As spacer I use a pile of gaskets form a hardware store, I think now I have 6 gaskets under each screw. BTW, if anyone know any interesting idea how with this free-placing mounting method to co-center the driver with horn’s hole then share it.

The Cat

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
12-20-2008 Post does not mapped to Knowledge Tree
decoud
United Kingdom
Posts 247
Joined on 03-01-2008
Post #: 6
Post ID: 9225
Reply to: 9224
Solution
fiogf49gjkf0d
Many thanks to Romy and others for the suggestions. I_should_coco, would you mind sharing the name of the company that made your adapters for the benefit of those of us in the UK? I suppose they may still have your designs, which would make it easier....

Regarding centering: how about  making the bolt holes on the ring oversize relative the bolt diameter so that there is some play in the position until the nuts are tightened? Obviously, one would have to have oversize spacers too.
12-20-2008 Post does not mapped to Knowledge Tree
i_should_coco
UK
Posts 15
Joined on 08-25-2005
Post #: 7
Post ID: 9226
Reply to: 9225
Contact details
fiogf49gjkf0d
Yes, the company that made mine is called "pulse racing" - http://www.pulse-racing.co.uk/ They're on Slough Trading Estate.

I gave them the details and also took an S2 in for them to measure. When they arrived they fitted absolutely perfectly, so I'd highly recommend them

Cheers,
Pete
12-20-2008 Post does not mapped to Knowledge Tree
decoud
United Kingdom
Posts 247
Joined on 03-01-2008
Post #: 8
Post ID: 9227
Reply to: 9226
Reference
fiogf49gjkf0d
Very many thanks, Pete: I shall drop them a line. I don't suppose you have a reference number or something by which they could identify the job? If they have got a CAD file on it already there would be no need for them to do any more measurements....Best, d
12-20-2008 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,160
Joined on 05-28-2004
Post #: 9
Post ID: 9228
Reply to: 9225
Regarding the centering
fiogf49gjkf0d
 decoud wrote:
Regarding centering: how about making the bolt holes on the ring oversize relative the bolt diameter so that there is some play in the position until the nuts are tightened? Obviously, one would have to have oversize spacers too.
There are zillion way to make it centerable. The key is not to how to center the driver technical but how to know that it is centered. It might not be so simple as one might think. In 400Hz horn it possible to take bug screens and to touch the crack between driver and horn until it will be not sensible. Wherever it will be shell be somehow marked. A big question HOW. In 250Hz horn is it more complicated and my hands for instance cannot reach the throat and I was forced to take bug screens off, paint the side of the S2 flare with silver and to beam light into the horn. Still, to mark what the holed would be and how it will be drifted after you tight the bolts are kind of complicated. If a horn a machined made then the maker can put marks for mounting holes. In case the horn is “homemade” then be prepared that the throat will not be a perfect circle and you would need to find a compromise in the driver centering. For S2, for any MF drivers that shoot above 5-7kHz, the axis centering is very important…

The caT

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
12-20-2008 Post does not mapped to Knowledge Tree
i_should_coco
UK
Posts 15
Joined on 08-25-2005
Post #: 10
Post ID: 9229
Reply to: 9227
No reference
fiogf49gjkf0d
 decoud wrote:
Very many thanks, Pete: I shall drop them a line. I don't suppose you have a reference number or something by which they could identify the job? If they have got a CAD file on it already there would be no need for them to do any more measurements....Best, d

Sadly not, I doubt they'd remember, it's quite a small operation. I just sent them some diagrams. If you PM me you e-mial, I can forward you my communications.
12-21-2008 Post does not mapped to Knowledge Tree
decoud
United Kingdom
Posts 247
Joined on 03-01-2008
Post #: 11
Post ID: 9231
Reply to: 9229
Centering continued
fiogf49gjkf0d
Many thanks, Pete, my email is my username at boltblue.com

Romy, about the centering: if one casts the horns - as i propose to do, the accuracy will be close to that of the mould, which can be directly measured before the stuff is poured in. What kind of precision are we talking about here (for an MF horn), do you think? Better than 0.5mm?
03-21-2009 Post does not mapped to Knowledge Tree
jessie.dazzle


Paris, France
Posts 456
Joined on 04-23-2006
Post #: 12
Post ID: 10054
Reply to: 9231
Centering in on centering
fiogf49gjkf0d
For centering :

The thickness of the ring that clamps the "bug screens" is around 3mm; in other words, there is a very short (+-3mm deep) "horn" in front of the screen. This allows one to center the driver using a metal (or hard material) tube or plug of the same diameter (in my case, a large 1/2 drive socket, from a socket wrench, on a long extension) , inserted from the front of the horn. This will also stop any drift of the horn during tightening of the mounting flange bolts.

Getting adaptors made :

Pete, if you have trouble getting the adaptors made elsewhere, I can dig up the info of the guy who made mine. I don't remember the price, only that it was very reasonable. He does not work with CAD info, so I had to supply prints. I shall now attempt to post them (wish me luck; in the past this has never worked. One of the few uncivilized aspects of the Good Sound Club web site is an historic incompatibility with civilized browsers, making certain operations, such as the posting of image files, impossible via a Mac !!!).

Otherwise, I will post them once back at work where I have access to a PC.

jd*






How to short-circuit evolution: Enshrine mediocrity.
03-21-2009 Post does not mapped to Knowledge Tree
jessie.dazzle


Paris, France
Posts 456
Joined on 04-23-2006
Post #: 13
Post ID: 10055
Reply to: 10054
Drawing : S2 mounting adaptor in inches
fiogf49gjkf0d
Just realized that the drawing I attached was "dimensioned" in mm (this is why some of the numbers are carried out to four places after the decimal point). Here's the same drawing in inches.

jd*




How to short-circuit evolution: Enshrine mediocrity.
03-21-2009 Post does not mapped to Knowledge Tree
decoud
United Kingdom
Posts 247
Joined on 03-01-2008
Post #: 14
Post ID: 10056
Reply to: 10054
Centering options
fiogf49gjkf0d
Thanks, Jessie; for the benefit of others here I can confirm pulse-racing are excellent, just as Pete found. They still have his CAD file, so if you are happy with the bolt placement no need even to send them a drawing.

What is definitely not excellent, as often lamented on this site, is the options for horn manufacture.  Jessie, I do wish you commercialized your technology....
03-21-2009 Post does not mapped to Knowledge Tree
jessie.dazzle


Paris, France
Posts 456
Joined on 04-23-2006
Post #: 15
Post ID: 10057
Reply to: 10055
Adaptor thickness etc.
fiogf49gjkf0d
And here is an image showing the driver in the mounting plate (still unable to upload the images; can only include them as attachments. Also, I have to do this one image per post).

Threading on the S2 does not go all the way to the tip of the driver, hence, using of an adaptor made from material having a thickness greater then 10mm is a waste. In the attached image, the shiney ring on the driver's "nose" is the part that has no threading. It is slightly smaller than the threaded part. If having horns machined from a hard material, it would be smart to make use this feature as originally intended; that is to say, as a centering aid.

jd*

How to short-circuit evolution: Enshrine mediocrity.
Page 1 of 1 (15 items) Select Pages: 
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Vitavox’s S2 Survival Guide...  A typical convention......  Horn-Loaded Speakers Forum     124  1363726  07-16-2004
  »  New  Vitavox S2 with Electromagnets..  Cutter Head/Servo...  Horn-Loaded Speakers Forum     91  1072103  01-12-2006
  »  New  S2 Hissing Sound..  Cleaning Time Revisited......  Horn-Loaded Speakers Forum     12  114024  07-18-2006
  »  New  Vitavox S2 driver made in china..  What does it do right?...  Horn-Loaded Speakers Forum     36  286395  12-20-2006
  »  New  Phoenix..  Mute vitavox...  Horn-Loaded Speakers Forum     2  28140  03-20-2009
  »  New  Living Voice Loudspeaker..  A Polish Infomercial from Kevin Scott....  Horn-Loaded Speakers Forum     80  689904  08-09-2009
  »  New  French Horns/drivers shootout (oops! S2 came last)..  My bad...  Horn-Loaded Speakers Forum     7  74018  12-07-2010
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