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Old 02-14-2010, 08:46 PM   #1
buffalobrewer
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I'm working on getting some boards/switches mounted in my control panel and have drilled some holes for sensor connections but they came out lousy (very frayed on the inside). I have a spade bits for the larger holes.

So, what is the best way to drill a clean hole through fiberglass?

 
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Old 02-14-2010, 09:01 PM   #2
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i usually do it about halfway thru then start from the other side to minimize splintering/fraying, especially with spade bits.
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Old 02-14-2010, 09:14 PM   #3
buffalobrewer
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i'll try that on the ones where I can fit the drill/bit inside of the enclosure.

Thanks

 
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Old 02-14-2010, 09:15 PM   #4
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Step drills work very good

 
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Old 02-15-2010, 03:24 AM   #5
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Duct Tape. Tape both sides then drill the hole. That should keep the fraying down.
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Old 02-15-2010, 11:58 AM   #6
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Use a Forstner Bit and clamp a board tight to the back side of what you are going to drill. The Forstner Bit will drill a nice clean hole topside and the board will prevent tearout on the back.
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Old 02-15-2010, 02:20 PM   #7
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+1 on the backing board. Works great, and keeps most of the mess on the outside! Use a spade bit with the points on the outside to keep the hole edge clean. Flat bits will blow out the front side too.
Or a hole saw...
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What does the primary pressure gauge on the tank tell us? That's right, the temperature. Put it on a scale if you want to know how much is in it...
Put some duct tape over the gauge - Or better yet - Replace the high pressure gauge with a plug - High pressure gauges are useless!

 
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Old 02-15-2010, 02:25 PM   #8
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Quote:
Originally Posted by SweetSounds View Post
+1 on the backing board. Works great, and keeps most of the mess on the outside! Use a spade bit with the points on the outside to keep the hole edge clean. Flat bits will blow out the front side too.
Or a hole saw...
A Forstner Bit won't blow out the front side. BTDT
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Old 02-15-2010, 02:29 PM   #9
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Quote:
Originally Posted by Sawdustguy View Post
A Forstner Bit won't blow out the front side. BTDT
Very true! Just mentioned because OP already has a spade bit, and forstner bits are spendy
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Quote:
Originally Posted by Ecnerwal View Post
What does the primary pressure gauge on the tank tell us? That's right, the temperature. Put it on a scale if you want to know how much is in it...
Put some duct tape over the gauge - Or better yet - Replace the high pressure gauge with a plug - High pressure gauges are useless!

 
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Old 02-15-2010, 02:39 PM   #10
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Quote:
Originally Posted by SweetSounds View Post
Very true! Just mentioned because OP already has a spade bit, and forstner bits are spendy
Right you are.....
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