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Filling old bolt pattern and drilling in a new one

Printed From: Speakerplans.com
Category: Plans
Forum Name: Scoops
Forum Description: One scoop or two ;-)
URL: https://forum.speakerplans.com/forum_posts.asp?TID=99187
Printed Date: 29 March 2024 at 1:15pm
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com


Topic: Filling old bolt pattern and drilling in a new one
Posted By: love2all
Subject: Filling old bolt pattern and drilling in a new one
Date Posted: 07 September 2017 at 12:26pm
Never had to do this before as always used reccomended drivers or always purchased loaded....

I need to fill in a PD bolt pattern to make room for a different driver brand and then drill in the new bolt pattern. Speakers are expensive and in mint condition so want to make sure its 100% right aesthetically and that its 100% sealed.

Ive got a professional on the case however ive had suggestions ranging from 2 part filler and sanding too glue and a dado rail slightly larger than the holes to be glued and hammered in.

Interested to see how the other pro's here would tackle this issue?? Also want to make sure the driver is mathematically centered correctly...any tips to ensure they are not off centre.

Thank you!



Replies:
Posted By: imageoven
Date Posted: 07 September 2017 at 10:14pm
What sort of cab is it? is access easy enough?

I would just use filler in the holes.
Knocking some dowels in tight, trimming and then filling would be stronger but overkill. A plug of filler 6mm or so in diameter and 18mm deep will have plenty of surface area to bond to so is not coming out of the hole easily. Press it in from both sides.

Why does the driver need to be 'mathematically centered'? Can you not just drop the driver in the hole, measure the distance to the edge of the cab on each side and adjust until they're the same?, then mark up the new fixing points.


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Keep pushing on, things are gonna get better.


Posted By: nickyburnell
Date Posted: 07 September 2017 at 10:44pm
Use t nuts that are there with a countersunk head bolt. Do them up and leave them flush



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It's everything, not everythink!


Posted By: love2all
Date Posted: 07 September 2017 at 10:46pm
Cabs are......you guessed it...scoops. thanks for your knowledge.


Posted By: love2all
Date Posted: 07 September 2017 at 10:47pm
@nicky I like this method...nice and quick. Will it be completely sealed though?


Posted By: nickyburnell
Date Posted: 07 September 2017 at 11:11pm
Done it loads, chuck some silicone around the bolt if you like. I actually used a layer of gaffa under driver to act as gasket when I did it on some old chipboard cabs.

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It's everything, not everythink!


Posted By: love2all
Date Posted: 08 September 2017 at 7:21am
Nice tip! Thank you


Posted By: Dub Specialist Sound
Date Posted: 08 September 2017 at 9:09am
As we box builders know few ways

Use a dowel plug, then use polythene glue that will fill any very very tiny gap will be filled 

as it expands

aslo 2pack filler , will be rock solid

filled many customers boxs with way bigger holes gauges , like someone has kicked a great big hole in a box one time, sorted it no problem at all





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Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...


Posted By: nickyburnell
Date Posted: 08 September 2017 at 9:44am
Originally posted by love2all love2all wrote:

Nice tip! Thank you
 
And of course you can reverse the situation should you change drivers back


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It's everything, not everythink!


Posted By: love2all
Date Posted: 08 September 2017 at 10:06am
Solid advice!


Posted By: snowflake
Date Posted: 08 September 2017 at 10:14am
to centre it just put the driver in the hole and then push it as far as it will go toward each bolt position and mark with a pencil. you will then have eight pencil marks around the driver - if you get it equal distance from each it is centred.


Posted By: love2all
Date Posted: 08 September 2017 at 10:26am
Thanks will try this...really impressed with nickys solution first time anyone suggessted this.


Posted By: SouthwestCNC
Date Posted: 08 September 2017 at 10:37am
Personally id drill them out to 9/10mm (depending on what size plugs you make), get myself a plug cutter and with a bit of pva and plug them. Very easy to do and once flushed off look either smart or almost invisible depending what wood you cut the the plugs from.

To get centre all you need is a template and two holes marked up to reference from, easy enough, just mark up an axis through the centre of the cutout parallel to the box sides and mark the two holes using the cutout as reference or if you want the holes offset from centre, You simply need to mark the template with the angle of rotation from the centre axis and instead of marking the two holes in last step you mark the outside of the template on the driver panel instead.


Posted By: love2all
Date Posted: 08 September 2017 at 11:55am
They cut out for m6 bolts so thinking i need 8mm plug to tap in with some pva... not much of a craftsman so going to get the job outsourced but wanted to know what people thought were good options. Nickys is deffo fool proof but just wondering on how airtight it would be...


Posted By: markie
Date Posted: 08 September 2017 at 12:00pm
You can get fluted dowels, which will give better adherance, particularly if used with a polyurethane glue rather than PVA.

http://www.ebay.co.uk/itm/Assorted-Wooden-Dowels-Fluted-Pin-Wodwork-Tool-Grooved-Beech-Wood-M6-M8-M10-/121799052477?epid=1642239972&hash=item1c5bca0cbd:m:mWNypa_n96CD_m-WC4QPk1w" rel="nofollow - http://www.ebay.co.uk/itm/Assorted-Wooden-Dowels-Fluted-Pin-Wodwork-Tool-Grooved-Beech-Wood-M6-M8-M10-/121799052477?epid=1642239972&hash=item1c5bca0cbd:m:mWNypa_n96CD_m-WC4QPk1w


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If it's got wheels or tits it's gonna cost a fortune


Posted By: love2all
Date Posted: 08 September 2017 at 12:19pm
That makes life easy! Another solid suggestion.


Posted By: love2all
Date Posted: 13 September 2017 at 2:09pm
Hello - what silicone do you reccomend? Also is there any other product which one can suggest to help create a seal (no air leak)


Posted By: Sinai Sound
Date Posted: 13 September 2017 at 7:02pm
Use an insert nut in the old holes

Then put a bolt in it from the otherside, inside the chamber

Done 


Posted By: love2all
Date Posted: 14 September 2017 at 7:24am
Even easier...thanks


Posted By: bee
Date Posted: 14 September 2017 at 9:46pm
Originally posted by nickyburnell nickyburnell wrote:

Use t nuts that are there with a countersunk head bolt. Do them up and leave them flush

 
done it this way many times, that way you can swop driver back ect, I prefer lock tight to silicone.


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https://www.elements-audio.com


Posted By: love2all
Date Posted: 15 September 2017 at 8:20am
Nice one bee



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