Cutting a hole for a subwoofer...

trdehmer · May 26, 2020

I've done it before, but it was a long time ago! I know I used a Dremel with some type of rotary drill bit on it and I remember it working very well. Anyone know what type of Dremel rotary drill bit is best to use cutting through the fiberglass?

Stee6043 · May 26, 2020

After many "not so circular" attempts and sawing larger holes in my life I finally bought the rig below. This thing is awesome. I used it for a sub install in fiberglass as well. Money well spent...

https://www.amazon.com/gp/product/B001PI8S6O/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Great lakes pirate · May 26, 2020

OllieC · May 26, 2020

I used the multi-purpose cutting bit. IIRC you'll go through a couple of them because the fiberglass will dull them over time, but they worked well when I installed my JL's. Dust everywhere tho....
I also used the depth adjuster attachment to keep it flat.

https://www.dremel.com/en_US/products/-/show-product/accessories/561-multipurpose-cutting-bit

trdehmer · May 26, 2020

OllieC said:
I used the multi-purpose cutting bit. IIRC you'll go through a couple of them because the fiberglass will dull them over time, but they worked well when I installed my JL's. Dust everywhere tho....
I also used the depth adjuster attachment to keep it flat.

https://www.dremel.com/en_US/products/-/show-product/accessories/561-multipurpose-cutting-bit

Thanks. That is what I ordered, looks familiar to what I used in the past. I'll have my shop vac handy!

ENstig8or · May 26, 2020

Great lakes pirate said:

This is what I used. Simple!

JimG · May 26, 2020

I used a Rotozip...
https://www.lowes.com/pd/RotoZip-Ro...8XuDc_qoABfAOLirxsRoCvW0QAvD_BwE&gclsrc=aw.ds

trdehmer · May 26, 2020

JimG said:
I used a Rotozip...
https://www.lowes.com/pd/RotoZip-Ro...8XuDc_qoABfAOLirxsRoCvW0QAvD_BwE&gclsrc=aw.ds

Which to me seems the easiest way to cut a circle. I have a jigsaw, but with those blades I think its hard to cut a good circle IMO.

Shaps · May 26, 2020

JimG said:
I used a Rotozip...
https://www.lowes.com/pd/RotoZip-Ro...8XuDc_qoABfAOLirxsRoCvW0QAvD_BwE&gclsrc=aw.ds

+1 for Rotozip
using this attachment
https://www.homedepot.com/p/Rotozip...ng-Sheetrock-Drywall-and-Wood-CRCT4/203362526

dwna1a · May 27, 2020

Not to be a smart butt or anything, be sure you set the depth and also know what's behind the are you want to cut into. Dremel makes a gauge that screws onto the end of the tool, just like the Rotozip.

My neighbor cut a beautiful hole, perfectly round. He also cut the fuel fill hose and and vent line.

Joel Jennings · Aug 17, 2020

My 250 Sundancer (260 from 2010 on to 2016 I believe) seems to have a pre-cut where the premium stereo upgrade sub is supposed to be. Anyone know if it is safe to cut and nothing is behind it?

flyboycj84 · Aug 17, 2020

I find this the best for cutting or enlarging speaker holes. And most other glass cutting.
https://www.harborfreight.com/electric-body-saw-65766.html

Joel Jennings · Aug 18, 2020

I used a dremel with a cutting bit. Worked great!

Cutting a hole for a subwoofer...

trdehmer

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Stee6043

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Great lakes pirate

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OllieC

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trdehmer

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trdehmer

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