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Bill Higgs
PostPosted: Mon Mar 09, 2020 10:38 pm 
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I think I'm going to go ahead and make an elliptical template to cut my future sound ports.
What diameter router bit (downcut spiral I presume) would you recommend to give the least possibility of tearout?
Would it be larger or smaller? Sorry, I am new as far as router bit knowledge.
I am using a laminate trimmer with 1/4" shank compatibility, so it couldn't be any larger diameter than 1/4".
Thanks

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Colin North
PostPosted: Tue Mar 10, 2020 2:13 am 
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FWIW I use a 1/4" downcut spiral bit (CMT) with a 1/4" laminate trimmer for my soundports, no problems for tear-out.

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The name catgut is confusing. There are two explanations for the mix up.

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Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.
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bcombs510
PostPosted: Tue Mar 10, 2020 6:32 am 
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Same, 1/4”. I also made the templates for the port using an oval template from hobby lobby. They sell a set of plastic templates that I transferred onto 1/4” thick ply and cut close with the jigsaw and finished off with the spindle sander.

If you can find it the article from Jay Lichty in AL shows his clamping method. It works quite well to keep the whole setup stable.


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Barry Daniels
PostPosted: Tue Mar 10, 2020 10:28 am 
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Router bits with 1/4" shanks certainly can have a larger diameter cutter. Not that you need that for a soundport. I use a 1/4" bit for that. Also, it does not have to be a downcut unless you are using especially chippy wood.
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Bill Higgs
PostPosted: Tue Mar 10, 2020 6:15 pm 
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Thanks guys. 1/4" sounds like the plan.

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DannyV
PostPosted: Fri Mar 13, 2020 11:51 am 
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1/8 with a 1/4 shank would be my personal preference. And fairly fresh ; )
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bluescreek
PostPosted: Tue Mar 17, 2020 8:01 pm 
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never use down cuts just be sure to use a sharp one

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