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Offline blown motor

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Drill bit question
« on: February 03, 2021, 02:35:51 PM »
My car has a fibreglass hood and I need to drill a hole in the underside to allow for a bolt head when I close it. Which would be better to use, a wood bit or a steel bit?

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Offline Brads70

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Re: Drill bit question
« Reply #1 on: February 03, 2021, 02:43:23 PM »
Just a thought... can you replace the bolt with a low head socket head cap screw? Or button head?
A wood bit will work just fine in fiberglass though. 

Offline Skdmark

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Re: Drill bit question
« Reply #2 on: February 03, 2021, 02:58:30 PM »
Use a very sharp drill preferably with a split point and a point angle around 135 deg.
That would be closer to what you would use in steel.

The split point helps from the drill walking on you.
The flatter point angle will reduce the drill grabbing in the material vs a longer point.
The sharpness is to prevent delamination of the fibers.
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Re: Drill bit question
« Reply #2 on: February 03, 2021, 02:58:30 PM »

Offline Rich G.

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Re: Drill bit question
« Reply #3 on: February 03, 2021, 08:31:13 PM »
Id use a dremmel with a small carbide bit for more control and less chance of a drill bit ripping the fiberglass or pulling you through the other side.

Offline jimynick

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Re: Drill bit question
« Reply #4 on: February 03, 2021, 08:40:20 PM »
Just take one of those old tire irons you've got, take it to the emery and sharpen a point on it and then get your BFH and git 'er done!  ;)
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Offline blown motor

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Re: Drill bit question
« Reply #5 on: February 05, 2021, 05:40:59 AM »
I drilled a 1/16 pilot hole, then 1/8. Then I used a 5/8 wood bit and cleaned up the inner edges with a file. Dabbed a little paint on it and looks like its meant to be there.

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Re: Drill bit question
« Reply #5 on: February 05, 2021, 05:40:59 AM »

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