How to make a small precise rectangular hole? - Fiberglass RV


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Old 08-01-2014, 04:26 AM   #1
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How to make a small precise rectangular hole?

I need to make a small very precise rectangular hole in my upper cabinet for a small volt meter. My 1st inclination is to use a Dremel tool with cut off wheel very carefully. But seeing I am not in any rush, figured I'd ask you folks how you would do it. Any ideas would be greatly appreciated.

Here's where it's going (near a light for easy wiring):

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Old 08-01-2014, 05:05 AM   #2
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A multitool Frank with a half round blade, a very clean cut and easy to control. You will probably have to use a hack saw blade to finish the corners, a few strokes but it is a sweet clean cut, been there done that.
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Old 08-01-2014, 05:50 AM   #3
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Use the middle of the hole for practice regardless of what tool you pick.
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Old 08-01-2014, 06:09 AM   #4
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Done. Dremel, heavy duty cut-off wheel, metal ruler clamped to guide cuts.



The volt meter will fit, but tight. I'm not putting it all the way in till I get it wired to the light near it.

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Old 08-01-2014, 06:15 AM   #5
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I would have some concerns cutting a hole that large so close to the corners of the two openings shown in your photo. I think you might compromise the structure of that cabinet. That area here you want to remove material would be weakened. Could you surface mount the meter ?
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Old 08-01-2014, 06:16 AM   #6
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OOPS ! a few minutes late.
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Old 08-01-2014, 06:18 AM   #7
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I would have some concerns cutting a hole that large so close to the corners of the two openings shown in your photo. I think you might compromise the structure of that cabinet. That area here you want to remove material would be weakened. Could you surface mount the meter ?
Um, it's already done! We'll see how it goes. If it becomes a problem, I'll report back.

From my perspective, I would have concerns if I were to leave the hole empty. That is not the case. The volt meter fits tightly in there, and brings structural stability back into play.

Frank
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Old 08-01-2014, 07:16 AM   #8
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I was under the impression that when cutting a hole in fiberglass it was best to have round corners to avoid cracks from starting there. That's what I did in any opening that I cut, like for my new power converter and below cabinet storage access opening. Reinforced those openings with plywood because of their size and the weight of the converter.
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Old 08-01-2014, 11:31 AM   #9
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I was under the impression that when cutting a hole in fiberglass it was best to have round corners to avoid cracks from starting there.

I like to drill holes in the corners before cutting anyway in circumstances such as this. Gives me a defined stopping and starting point if nothing else.
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Old 08-01-2014, 11:36 AM   #10
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Exactly what I did Tim
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Old 08-01-2014, 12:07 PM   #11
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Quote:
Originally Posted by mary and bob View Post
I was under the impression that when cutting a hole in fiberglass it was best to have round corners to avoid cracks from starting there. That's what I did in any opening that I cut, like for my new power converter and below cabinet storage access opening. Reinforced those openings with plywood because of their size and the weight of the converter.
I reinforced the back side of holes that I cut in the fiberglass (outlets) with 1/4" plywood glued in place with Gorilla glue . Really stiffens and strengthens the area around the hole
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Old 08-01-2014, 04:47 PM   #12
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A serated or saw tooth blade on the dremel might have been a bit easier.
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Old 08-02-2014, 09:40 AM   #13
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A serated or saw tooth blade on the dremel might have been a bit easier.
I used a very thin fine toothed Japanese hand saw to make the corner cuts.

Sometimes I wonder if I should even post stuff!

Frank
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