DIY weighted diaphragm stretcher (pic) - Page 3

Paul Ranson · 12th October 2007, 08:48 PM

The Quad 63 coating is two layers, a white sublayer and then the grey coating. The photo is presumably of the application of the white stuff.

I've used a variation of the (I think) 'I Forgot' inspired inner tube stretcher,

Using an open frame both sides of the stretched film are accessible.

Paul

I_Forgot · 12th October 2007, 11:43 PM

The coating on the drivers in my 63s sure looked brushed on to me. Maybe they changed their process at some point in their many year production history.

I_F

harry_at · 4th November 2007, 12:12 AM

Hello to all,

seems to be a stretching jig contest. So here is mine. Looks like the great brother from Arend-Jans jig - but it has more clamps on the short sides similar to the original 63´stretcher. This beast is two meters long and fills the room...all for my Quads.

Harry

arend-jan · 4th November 2007, 01:09 AM

Very very nice!

Increasing the number of clamps is indeed a logical improvement which I considered at one point too, but I decided to stay as close as possible to the original as to not introduce more unknowns to the equation.

Mind if I contact you privatly?

GlidingDutchman · 3rd April 2008, 08:54 AM

Any ideas on building a jig to refurb Martin Logan CLS II panels?

Big - very big...

GD

Calvin · 3rd April 2008, 12:37 PM

Hi,

basically like in post #10. Just use 1 beam at the ends not such a complicated lever construction. This beam needs to have a curved surface equal to the panel´s curvature. But build it stiff! There will develop considerably high forces when stretching the membrane.

jauu
Calvin

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12th October 2007, 08:48 PM	#21
Paul Ranson diyAudio Member Join Date: Sep 2003 Location: n	The Quad 63 coating is two layers, a white sublayer and then the grey coating. The photo is presumably of the application of the white stuff. I've used a variation of the (I think) 'I Forgot' inspired inner tube stretcher, Using an open frame both sides of the stretched film are accessible. Paul

12th October 2007, 11:43 PM	#22
I_Forgot diyAudio Member Join Date: Jan 2005 Location: Phoenix, Az.	The coating on the drivers in my 63s sure looked brushed on to me. Maybe they changed their process at some point in their many year production history. I_F

4th November 2007, 01:09 AM	#24
arend-jan diyAudio Member Join Date: May 2006 Location: Netherlands	Very very nice! Increasing the number of clamps is indeed a logical improvement which I considered at one point too, but I decided to stay as close as possible to the original as to not introduce more unknowns to the equation. Mind if I contact you privatly?

3rd April 2008, 08:54 AM	#25
GlidingDutchman diyAudio Member Join Date: Nov 2007	Any ideas on building a jig to refurb Martin Logan CLS II panels? Big - very big... GD

3rd April 2008, 12:37 PM	#26
Calvin diyAudio Member Join Date: Nov 2004 Location: close to Basel	Hi, basically like in post #10. Just use 1 beam at the ends not such a complicated lever construction. This beam needs to have a curved surface equal to the panel´s curvature. But build it stiff! There will develop considerably high forces when stretching the membrane. jauu Calvin

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