Magnet Shift Repair Solved...for me that is.

13

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  • xschop
    xschop Posts: 5,000
    Made another more precision Pole-piece removal and centering tool. 0.996 ID and 1.299 OD....

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    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 25,436
    Sweet👍
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  • Sound_Recluse
    Sound_Recluse Posts: 74
    Very nice!!!
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  • BlueBirdMusic
    BlueBirdMusic Posts: 2,277
    xschop, Elon Musk could use your talents.
    "Sometimes you have to look to the past to understand where you are going in the future"

    Anger is just anger. It isn’t good. It isn’t bad. It just is. What you do with it is what matters.
    You can use it to build or to destroy. You just have to make the choice.     Jim Butcher




    Harry / Marietta GA
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  • xschop
    xschop Posts: 5,000
    Elon just needs another tax-payer funded bailout (and some better battery armor).

    I tested it out on my 2nd mw6502. It took all of 5 minutes (pole-piece/magnet was already blue lock-tited previously)

    All locked in place and final centering, the stainless allen screws that I all matched at 1.50" protrude from the housing at equidistance from one another.

    Previously forgot to mention that the dimensions I posted also allow clearance for any Dynamat/Butyl mat so no need to remove if already applied to basket.

    The 3.20" opening also serves as the magnet seat when hammering the pole piece out of magnet...

    Happy Birthday America.

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    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 5,000
    2nd thought, maybe Elon can send one of his engineers to help set up this Kegerator....

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    Don't take experimental gene therapies from known eugenicists.
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  • Gardenstater
    Gardenstater Posts: 4,459
    By George I think he's done it!
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
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  • xschop
    xschop Posts: 5,000
    Gardenstater wrote: »
    By George I think he's done it!

    Indeed, the Kegerator is setting at 35 degrees and the fireworks are already on.
    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 5,000
    edited July 2020
    I'll update the drawing when I get a chance. I'm going to recess the top ID of the jig to recess and hold the magnet when it is being used as the dead-blow removal of magnet from pole-piece.

    This set is already spoken for by another member and I have ordered enough material to make only 9 more sets. I'll start a for sale thread and it will be 1st come first served.
    Post edited by xschop on
    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 5,000
    3.415" OD x 0.200" Depth for the magnet removal seat area.....

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    Don't take experimental gene therapies from known eugenicists.
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  • lawdogg
    lawdogg Posts: 455
    I love it when a plan comes together. Nice work.
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • Sound_Recluse
    Sound_Recluse Posts: 74
    lawdogg wrote: »
    I love it when a plan comes together. Nice work.

    Go ahead and get one for yourself lawdogg
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  • audioluvr
    audioluvr Posts: 5,582
    xschop wrote: »
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    I love the granite base! Solid! ;)
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    Harman Kardon T65C w/Grado Gold. (Don't laugh. It sounds great!)

    There is about a 5% genetic difference between apes and men …but that difference is the difference between throwing your own poo when you are annoyed …and Einstein, Shakespeare and Miss January. by Dr. Sardonicus
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  • xschop
    xschop Posts: 5,000
    lawdogg wrote: »
    I love it when a plan comes together. Nice work.

    If you're doing the repair service for members on your spare time, I'd be glad to send you a set, free of charge, to help out the community.
    Don't take experimental gene therapies from known eugenicists.
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  • xschop
    xschop Posts: 5,000
    Is anybody else finding their magnets' Inside diameter smaller than 1.282" ?

    Don't take experimental gene therapies from known eugenicists.
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  • jdjohn
    jdjohn Posts: 3,147
    Am I the only one who moved to the JB Weld Steel Steel Stick for this? I think I remember Trey @VR3 recommending the Steel Stick.
    "This may not matter to you, but it does to me for various reasons, many of them illogical or irrational, but the vinyl hobby is not really logical or rational..." - member on Vinyl Engine
    "Sometimes I do what I want to do. The rest of the time, I do what I have to." - Cicero, in Gladiator
    Regarding collectibles: "It's not who gets it. It's who gets stuck with it." - Jimmy Fallon
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  • VR3
    VR3 Posts: 28,636
    I used the stock before and it was easy to work with
    - Not Tom ::::::: Any system can play Diana Krall. Only the best can play Limp Bizkit.
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  • jdjohn
    jdjohn Posts: 3,147
    Using the Steel Stick, I think a 4-point compass application is sufficient.
    "This may not matter to you, but it does to me for various reasons, many of them illogical or irrational, but the vinyl hobby is not really logical or rational..." - member on Vinyl Engine
    "Sometimes I do what I want to do. The rest of the time, I do what I have to." - Cicero, in Gladiator
    Regarding collectibles: "It's not who gets it. It's who gets stuck with it." - Jimmy Fallon
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  • dcmeigs
    dcmeigs Posts: 708
    Nice work guys. I was just about to post asking for advice on reassembling a MW 7009 I have apart on the bench when I saw this thread. It looks like you have it covered in detail here. Much appreciated.
    The world is full of answers, some are right and some are wrong. - Neil Young
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  • xschop
    xschop Posts: 5,000
    dcmeigs wrote: »
    Nice work guys. I was just about to post asking for advice on reassembling a MW 7009 I have apart on the bench when I saw this thread. It looks like you have it covered in detail here. Much appreciated.

    Post magnet and pole-piece dimensions if you can.
    Don't take experimental gene therapies from known eugenicists.
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  • dcmeigs
    dcmeigs Posts: 708
    edited August 2020
    These are different animals I’m afraid. Check out the photos. The basket has a base or flange attached with 4 rivets. The pole piece has two magnets. The flange OD is 3.6 inches, somewhat larger than you’re dealing with.

    The Pole diameter is .99
    The ID of the hole in the flange is 1.08

    The annular area is the voice coil space of course.

    The larger magnet sets on the flange. For our purposes, the smaller magnet is just along for the ride.

    The large magnet OD is 3.39.

    It is glued to the pole piece which is 3.2 OD.

    I will need a jig such as yours with a 3.6 OD for the flange and a smaller OD with set screws to center the 3.2 pole piece.

    But wait! There’s MORE! The large magnet is not centered; its shifted all the way to the voice coil. It will need to be centered too. And re-epoxied.

    If you don’t want your thread jacked, I can start a fresh one.

    Thanks, Dave

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    The world is full of answers, some are right and some are wrong. - Neil Young
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  • xschop
    xschop Posts: 5,000
    The prototype dowel came back and am re-cutting it. I will make the rest at 1.281" OD for the smallest magnets. Seems like Polk was all over the place there too....

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  • dcmeigs
    dcmeigs Posts: 708
    What would be your recommendation for adhesive to reattach the souround to the basket? I dislike using contact cement because it's so unforgiving.
    The world is full of answers, some are right and some are wrong. - Neil Young
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  • xschop
    xschop Posts: 5,000
    WMG or F1 would know.
    Don't take experimental gene therapies from known eugenicists.
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  • pitdogg2
    pitdogg2 Posts: 25,436
    Aleans tacky glue. On both like contact cement and let set like contact but to the point of dry, when pressed together you still have some work time. I believe it works for the spider as well..

    On rubber surrounds you may be limited to more of a contact like cement. I've not had to repair one (knock on wood) yet. At one or another the recommendation of tire repair cement was in vogue.

    I've never used Aleans on rubber it was poly foam type and it worked well.
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  • lawdogg
    lawdogg Posts: 455
    Aileen's is also my preferred adhesive to attach the surround to the basket.
    <3 my 3.1TLs

    I will fix your shifted magnets for free. :)
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  • pitdogg2
    pitdogg2 Posts: 25,436
    pitdogg2 wrote: »
    Aleans tacky glue. On both like contact cement and let set like contact but not to the point of dry, when pressed together you still have some work time. I believe it works for the spider as well..

    On rubber surrounds you may be limited to more of a contact like cement. I've not had to repair one (knock on wood) yet. At one time or another the recommendation of tire repair cement was in vogue.

    I've never used Aleans on rubber it was poly foam type and it worked well.

    Fixed it.
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  • xschop
    xschop Posts: 5,000
    I know it works on paper cone tears.
    One of my shop speakers took a large flying metal chip awhile back. I fixed with Aileens and moved them to the top shelf.

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  • dcmeigs
    dcmeigs Posts: 708
    edited August 2020
    I’ve used Aleene’s with good success too, several years ago. I’ll go fetch some. I’ll also share a photo of my very low tech magnet centering method. Feel at liberty to laugh. The 18 gauge solid wire gets it in the ballpark and then I used an aluminum vice to dial it in a little after applying the epoxy. It’s going to be pretty close when none of the wires are in a bind. The Devcon 5 minute epoxy with the static mixing nozzles are perfect for injecting the epoxy between the magnet and basket. Not a very elegant solution but I expect it to work well enough.

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    The world is full of answers, some are right and some are wrong. - Neil Young
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  • Gardenstater
    Gardenstater Posts: 4,459
    Alright I can't take it any longer.......what are these wire segments I'm looking at? Surely those can't be voice coil to pole piece gap spacers (sorry for calling you Shirley). :D
    George / NJ

    Polk 7B main speakers, std. mods+ (1979, orig owner)
    Martin Logan Dynamo sub w/6ft 14awg Power Cord
    Onkyo A-8017 integrated
    Logitech Squeezebox Touch Streamer w/EDO applet
    iFi nano iDSD DAC
    iPurifier3
    iDefender w/ iPower PS
    Custom Steve Wilson 1m UPOCC Interconnect
    iFi Mercury 0.5m OFHC continuous cast copper USB cable
    Custom Ribbon Speaker Cables, 5ft long, 4N Copper, 14awg, ultra low inductance
    Custom Vibration Isolation Speaker Stands and Sub Platform
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