[hcraig244]

last

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[hcraig244]

some more

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[hcraig244]

here we go…

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[hcraig244]

That’s a very ambitious undertaking Jouni..

All credit to you, the cost of producing such a piece must be high…not including your time of course which you give freely, my few dealings with custom laser printed items has always resulted in high costs.

I will provide the images you have requested today……keep the pictures coming.

Craig

[hcraig244]

Jouni

I bought the 15v battery relatively recently, amazon I think VARTA No 4074.15v.V74PX

Craig

[hcraig244]

Oh….and a 15v battery

If I can help anymore let me know

Craig

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[hcraig244]

Couple more

 

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[hcraig244]

No worries Jouni

Not the best images but take a look….

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[hcraig244]

Ahh…..nothing so adventurous Glitch, tried and tested hair dryer technique. So here is the finished article still giving 3.8 ohms and now moving freely….wont commit this to the postal service today  as it will languish in the system all weekend, not good….will send it back Monday morning.

Craig

[hcraig244]

Just needs to be left as the epoxy hardens, the dust cap glued back in place and posting back home…..I don’t know if there is a better way to do this……

[hcraig244]

The epoxy holding the magnet to the frame now hardened, more epoxy can be applied to the magnet face. The whole assembly is then, with a firm and steady grip….the magnet wants to pull down and sidewards, lowered onto the core held in the vice jaws carefully…..the coil is exposed to damage at this point as the core is guided inside it. With a clunk the magnet will grab the vice jaws which can then be released to allow the backplate to snap into place. The coil now gripped by the off centre core can be viewed through the dust cap apperture as the alignment jig is fitted tightly to the magnet by the bottom row of screws and the top row of screws adjusted up against the backplate and used to centre the backplate and core using the dust cap apperture as a guide until the it looks central and the cone and coil move freely within the magnetic field……

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[hcraig244]

The epoxy now dry on the backplate and core it goes back into the vice,  2 or 3mm below the vice jaws

 

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[hcraig244]

Glitch…

Yes the saucepan is simply a convenient diameter to rest the speaker on during removal of the dust cap and drying time of the epoxy, keeps any pressure off the cone and coil. The process of softening the dust cap comprises the use of my partners hair dryer providing hot air, this quickly softens the old adhesive which can then be very carefully lifted with a jewellers screwdriver….and in my case the use of a magnifying glass ;¬) takes a bit of patience but is quite straight forward.

• This reply was modified 1 week, 3 days ago by hcraig244.

[hcraig244]

These don’t need to be dead centre but just thereabouts, the accurate alignment will follow when the backplate and core are offered up to the magnet once everything has hardened off…….and in case anyone was wondering about the last pic it was taken through this magnifying glass, my eyes are not what they once where ;¬)

 

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[hcraig244]

Remove the old adhesive from magnet and backplate, not a lot there so easy task, and having applied some epoxy join them together….

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[hcraig244]

Next task is to soften the glue holding the dust cap in place, this needs to come off so I can see what im doing when putting everything back in place and to give me a clue when centering the core inside the coil.

 

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[hcraig244]

Michael….thank you for those kind words ;¬)

Cleaned up the core and backplate and applied apoxy last night….dried out nicely.

 

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[hcraig244]

All apart and ready for cleaning up prior to fresh epoxy, the coil still reading an encouraging 3.7 ohms….

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[hcraig244]

This is odd however……not seen this in the several I have taken apart, some sort of alluminium ring. Anyone got an explanation ? As can be seen the core has also dethatched itself from the backplate, the backplate and ferrite magnet will also need to be seperated.

• This reply was modified 1 week, 5 days ago by hcraig244.

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[hcraig244]

Came apart cleanly leaving the coil behind and, apart from a very slight inward burr, looking in good shape. The coil moves freely in the frame with no scratching on the sides and overall should be fine. You can see from the traces of adhesive on the frame that not a lot was applied during manufacturing

• This reply was modified 1 week, 5 days ago by hcraig244.
• This reply was modified 1 week, 5 days ago by hcraig244.

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