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Drilling and Tapping Topplate for Basket / 15"to10" recone


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So has anyone ever drilled/tapped their top plate for a new basket? I was going through my boneyard and found a old blown 15" audiobahn. Its got a pretty beefy magnet so i figured id recone. The cast aluminum basket is cracked so its out of the question. Im thinking about going with a 12" 12 point aluminum basket from psi. only problem is the original basket formed around the motor and bolted to the back plate. So i have to drill and tap the top plate to accept the new 127mm x 60 degree mounting pattern of the basket.

I figure if i leave the top plate attached and drill it i wont have to re attach it to the magnet (taping off the center to prevent shavings falling in of course). anyone ever done anything like this that can add a little insight?

Edited by M3RCURI
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I have my own farmer john technique lol. I don't have any templates. But another way you can do it is make an adapter from hddp plastic. I get it from Tap plastics and copy hole patterns etc. If you have money, there is people who will machine you adapter plates from 1/4"-1/2" aluminum

My Redneck idea is to glue(ca) the old frame and new frame together -the surfaces that are flat, align as good as possible, and copy the smaller bahn pattern with a 1/4" bit

Break apart and your done.

Is the Audiobahn coil the 2.4"or the 2.58"?

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I have my own farmer john technique lol. I don't have any templates. But another way you can do it is make an adapter from hddp plastic. I get it from Tap plastics and copy hole patterns etc. If you have money, there is people who will machine you adapter plates from 1/4"-1/2" aluminum

My Redneck idea is to glue(ca) the old frame and new frame together -the surfaces that are flat, align as good as possible, and copy the smaller bahn pattern with a 1/4" bit

Break apart and your done.

Is the Audiobahn coil the 2.4"or the 2.58"?

So basically your saying, make a top plate out of plastic (or get one machined). then just glue that to the existing top plate?

and as far as the redneck idea, i cant do that because the old basket attached to the bottom of the sub, not the top, so i cant drill new holes in the basket to match the existing holes because there are no existing holes in the motor/top-plate.

Edited by M3RCURI
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  • 4 months later...

UPDATE:

yea so finally got around to it and just drew up a template in sketchup and printed it to scale. Then just drilled new holes in the toplate carful not to drill into the magent. then tapped em. Acutally went with a budget build and cleaned up the old coil and got a new spider, cone and 10" basket. Overall $40 for a beefy little Ten.

Pics of the final product once my terminals come in.

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