Coral Flat 6 - magnet/frame seal problem.

nodiak · 11th February 2007, 03:56 PM

The drivers give off a "clang" when bumped, or even when setting down on a table magnet first. With a light effort the frame to magnet joint can be seperated, a hairline crack shows.
What's a good way to reseal the joint?
And is the clang inherent and just needs frame damping?
Don

Geoff H · 11th February 2007, 09:43 PM

Hi Don. I have a Pioneer driver here that's done the same thing. (I tossed out it's mate when I moved)

Seems the glue just gives up. The next knock moves the pole piece to one side jamming the VC.

If your drivers are what I think they are, you can't remove the dust cap to facilitate alignment. You need to remove the magnet and pole piece, remove all traces of adhesive. Then reassemble the unit. If you have a dial indicator, it may be possible to align the centre pole before the adhesive goes off. I'm not sure what adhesive to use, yet.

Post a pic of the front and the damage.

Regards,

Geoff

nodiak · 11th February 2007, 11:56 PM

Thanks for the reply Geoff. I'm not sure if my post came off right. I didn't bump it and cause any damage. I recently received these and noticed the light clang sound when setting them down. Some investigation turned up the adhesive had dried up, etc. Just explaining because I don't have a camera, and there's no frame damage.
These are some of the ones from diyparadise and have never been played. I got 4 from someone who bought several. Asked him to check his for this problem, but haven't heard back on that. Maybe others are having this problem?
There doesn't seem to be an alignment problem. I was hoping to remove the old adhesive and apply new. What's a good adhesive for this?
I'm hoping they don't need to taken apart and reassemble. I don't think I'd get into that.
Don

Geoff H · 12th February 2007, 01:58 AM

You're welcome Don.
If the magnet had dislodged completely, I'd remove all traces of adhesive, and use 3 or 4 drops of one of the cyanoacrylates (super glue). The magnet will provide most of the force, just need to locate it.

In your case, you could try Araldite. Close the joint with a vice or other clamp and build up a fillet over the crack, then the complete circle if successful. I don't know how well the Araldite will bond to the ceramic.

Good luck with it,
Geoff.

tomtt · 12th February 2007, 01:58 AM

might work

http://jbweld.net/index.php

Geoff H · 12th February 2007, 02:11 AM

Good point Tom. Says it will work on ceramic tiles. If it does, you'll never get it apart.

Geoff

nodiak · 12th February 2007, 02:12 AM

It's lucky there's no big seperation, just a hairline crack that shows when I give a light pull. I'll keep in mind the vc alignment issue after I've removed adhesive. tomtt, good old jb weld may be a good idea.
Thanks guys, Don

11th February 2007, 03:56 PM	#1
nodiak diyAudio Member Join Date: Nov 2004 Location: really northern cal. coast	Coral Flat 6 - magnet/frame seal problem. The drivers give off a "clang" when bumped, or even when setting down on a table magnet first. With a light effort the frame to magnet joint can be seperated, a hairline crack shows. What's a good way to reseal the joint? And is the clang inherent and just needs frame damping? Don

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11th February 2007, 09:43 PM	#2
Geoff H diyAudio Member Join Date: Oct 2006	Hi Don. I have a Pioneer driver here that's done the same thing. (I tossed out it's mate when I moved) Seems the glue just gives up. The next knock moves the pole piece to one side jamming the VC. If your drivers are what I think they are, you can't remove the dust cap to facilitate alignment. You need to remove the magnet and pole piece, remove all traces of adhesive. Then reassemble the unit. If you have a dial indicator, it may be possible to align the centre pole before the adhesive goes off. I'm not sure what adhesive to use, yet. Post a pic of the front and the damage. Regards, Geoff

11th February 2007, 11:56 PM	#3
nodiak diyAudio Member Join Date: Nov 2004 Location: really northern cal. coast	Thanks for the reply Geoff. I'm not sure if my post came off right. I didn't bump it and cause any damage. I recently received these and noticed the light clang sound when setting them down. Some investigation turned up the adhesive had dried up, etc. Just explaining because I don't have a camera, and there's no frame damage. These are some of the ones from diyparadise and have never been played. I got 4 from someone who bought several. Asked him to check his for this problem, but haven't heard back on that. Maybe others are having this problem? There doesn't seem to be an alignment problem. I was hoping to remove the old adhesive and apply new. What's a good adhesive for this? I'm hoping they don't need to taken apart and reassemble. I don't think I'd get into that. Don

12th February 2007, 01:58 AM	#4
Geoff H diyAudio Member Join Date: Oct 2006	You're welcome Don. If the magnet had dislodged completely, I'd remove all traces of adhesive, and use 3 or 4 drops of one of the cyanoacrylates (super glue). The magnet will provide most of the force, just need to locate it. In your case, you could try Araldite. Close the joint with a vice or other clamp and build up a fillet over the crack, then the complete circle if successful. I don't know how well the Araldite will bond to the ceramic. Good luck with it, Geoff.

12th February 2007, 01:58 AM	#5
tomtt diyAudio Member Join Date: Aug 2002 Location: kansas city mo, and on occasion, around the world ... Blog Entries: 15	might work http://jbweld.net/index.php

12th February 2007, 02:11 AM	#6
Geoff H diyAudio Member Join Date: Oct 2006	Good point Tom. Says it will work on ceramic tiles. If it does, you'll never get it apart. Geoff

12th February 2007, 02:12 AM	#7
nodiak diyAudio Member Join Date: Nov 2004 Location: really northern cal. coast	It's lucky there's no big seperation, just a hairline crack that shows when I give a light pull. I'll keep in mind the vc alignment issue after I've removed adhesive. tomtt, good old jb weld may be a good idea. Thanks guys, Don

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