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 9th May 2008, 06:14 PM #881 luvdunhill   diyAudio Member     Join Date: Jul 2006 Peter: I like the ML31.5 approach the best. A few questions: 1.) how tall are the springs with no load 2.) what is the outside diameter of the spring 3.) how tall are the springs with the load 4.) how much does the load weight? 5.) what is the shape of the wire: square, oval, round? I think we can find these easily. Also, the socket caps should be easy to find as well. I will calculate the resonant frequency of the above and then scale it to how much my metal frame will weigh and choose the spring based on this.
kevinkr
diyAudio Moderator

Join Date: Sep 2004
Location: Boston, Massachusetts
Quote:
 Originally posted by luvdunhill Peter: I like the ML31.5 approach the best. A few questions: 1.) how tall are the springs with no load 2.) what is the outside diameter of the spring 3.) how tall are the springs with the load 4.) how much does the load weight? 5.) what is the shape of the wire: square, oval, round? I think we can find these easily. Also, the socket caps should be easy to find as well. I will calculate the resonant frequency of the above and then scale it to how much my metal frame will weigh and choose the spring based on this.
Good approach, but don't assume that this will get you all the way, I would recommend getting springs having characteristics that bracket the calculated value by a wide margin. What ends up working best may not be what you initially calculated. (For example how do you choose the optimum resonant frequency for the mechanism mass given other variables like what you have it placed on? And its resonances..)
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MrMajestic
diyAudio Member

Join Date: May 2007
Quote:
 Originally posted by MrMajestic I have one spare EZ31 that I could part with if someone is interested. Realized I went a bit shop-happy when I found out they were in stock here
The player is no longer available. Its on its way to Norway for maming and mutilation

 9th May 2008, 09:28 PM #884 superhkm   diyAudio Member   Join Date: May 2005 Location: oslo Parts ordered. Mutilation to come.
Peter Daniel
diyAudio Member

Join Date: Jul 2002
Quote:
 Originally posted by luvdunhill Peter: I like the ML31.5 approach the best. A few questions: 1.) how tall are the springs with no load 2.) what is the outside diameter of the spring 3.) how tall are the springs with the load 4.) how much does the load weight? 5.) what is the shape of the wire: square, oval, round? I think we can find these easily. Also, the socket caps should be easy to find as well. I will calculate the resonant frequency of the above and then scale it to how much my metal frame will weigh and choose the spring based on this.
IIRC, the load (lead frame) is 5kg, the spring dia is 1". They are approx. 2" tall , the wire is round and they don't compress more than 0.1" under the load.
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kevinkr
diyAudio Moderator

Join Date: Sep 2004
Location: Boston, Massachusetts
Quote:
 Originally posted by superhkm Parts ordered. Mutilation to come.
My wife was pretty horrified by the whole mutilation part of it. (Oh, the horror of it.. ) Might best keep loved ones away from the scene of the surgery..
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"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine

Zigis
diyAudio Member

Join Date: May 2005
Location: Riga, Latvia
Thank you Franz for your kind offer, it is really hard to find DIP package today. I can't send you mail from here, can you mail me to zigisg/at/inbox.lv

Quote:
 Originally posted by Franz Gysi Finally? Nothing is finally, in my audio setup
Yes, I now this feeling

Peter Daniel, where can I see your DACs ?

Zigis.

JC Fardo
diyAudio Member

Join Date: Jun 2002
Location: Sao Paulo - Brazil
Quote:
 Originally posted by Peter Daniel IIRC, the load (lead frame) is 5kg, the spring dia is 1". They are approx. 2" tall , the wire is round and they don't compress more than 0.1" under the load.

Could you please tell us what is the wire diameter. Itīs also a helpful detail, if you donīt mind.

Assuming springs are made of "music" or harmonic wire, we are near to target.

Thanks a lot
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JC

Ed LaFontaine
diyAudio Member

Join Date: Feb 2004
Location: where the Appalachians rise from the Blue Grass
Swag

Quote:
 Could you please tell us what is the wire diameter?
Scaling from the photo Peter provided, I'll go out on a limb and guesstimate 0.079", +/- 0.005"

JC Fardo
diyAudio Member

Join Date: Jun 2002
Location: Sao Paulo - Brazil
Re: Swag

Quote:
 Originally posted by Ed LaFontaine Scaling from the photo Peter provided, I'll go out on a limb and guesstimate 0.079", +/- 0.005"

Exactly 2,0mm +/- guestimate margin. Not bad, Ed. Thanks
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JC

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