Drill bit type for abs plastic - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 08-11-2019   #1
 
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Default Drill bit type for abs plastic

I have 1/4" thick abs plastic baffles for my pillar pods. I have to counter sink the tweeters in it a hair. Would a forstner (I think is spelled it wrong) do this or do I need something else?
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Old 08-11-2019   #2
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Default Re: Drill bit type for abs plastic

Forstner is indeed what you want.

For a counter sink : https://www.amazon.com/KEO-53512-Sin...rsink-Uncoated
Those "hole in the side" counter sinks do make a winkle engine block hole.
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Old 08-11-2019   #3
 
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Default Re: Drill bit type for abs plastic

Quote:
Originally Posted by ToNasty View Post
I have 1/4" thick abs plastic baffles for my pillar pods. I have to counter sink the tweeters in it a hair. Would a forstner (I think is spelled it wrong) do this or do I need something else?
I haven't tried a forstner bit on plastic, but I use these bits and they make clean holes in plastic.

https://www.amazon.com/DEWALT-DW1720...ateway&sr=8-41

EDIT:
Oops, I misread that it's for a recess only, not a hole... Then yes, a forstner bit providing you have a drill press.

What diameter is the tweeter, or what diameter does the recessed area need to be?

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Old 08-11-2019   #4
 
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Default Re: Drill bit type for abs plastic

Quote:
Originally Posted by DavidRam View Post
I haven't tried a forstner bit on plastic, but I use these bits and they make clean holes in plastic.



https://www.amazon.com/DEWALT-DW1720...ateway&sr=8-41



EDIT:

Oops, I misread that it's for a recess only, not a hole... Then yes, a forstner bit providing you have a drill press.



What diameter is the tweeter, or what diameter does the recessed area need to be?
No drill press. Vice and a drill. I need about a 2" recess. Just to so down maybe 1/8"

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Old 08-11-2019   #5
 
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Default Re: Drill bit type for abs plastic

Quote:
Originally Posted by ToNasty View Post
No drill press. Vice and a drill. I need about a 2" recess. Just to so down maybe 1/8"

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Is there an existing hole already?

If so a router and rabbet bit could do a clean job, too.

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Default Re: Drill bit type for abs plastic

Quote:
Originally Posted by DavidRam View Post
Is there an existing hole already?



If so a router and rabbet bit could do a clean job, too.
Nope. I'm making the holes. I dont have any of those tools anymore nor the steadiness to use them

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Old 08-11-2019   #7
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Default Re: Drill bit type for abs plastic

The forstner is smooth going until it pokes through.
If one was poking it through, then drop in a 1/16" hole first. Then go in from the back side 1/16". Flip it over and "Bob's your uncle".
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