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| What diameter downcut spiral bit for sound port pattern? http://w-ww.luthiersforum.com/forum/viewtopic.php?f=10101&t=53006 |
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| Author: | Bill Higgs [ Mon Mar 09, 2020 10:38 pm ] |
| Post subject: | What diameter downcut spiral bit for sound port pattern? |
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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| Author: | Colin North [ Tue Mar 10, 2020 2:13 am ] |
| Post subject: | Re: What diameter downcut spiral bit for sound port pattern? |
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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| Author: | bcombs510 [ Tue Mar 10, 2020 6:32 am ] |
| Post subject: | Re: What diameter downcut spiral bit for sound port pattern? |
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. Sent from my iPhone using Tapatalk Pro |
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| Author: | Barry Daniels [ Tue Mar 10, 2020 10:28 am ] |
| Post subject: | Re: What diameter downcut spiral bit for sound port pattern? |
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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| Author: | Bill Higgs [ Tue Mar 10, 2020 6:15 pm ] |
| Post subject: | Re: What diameter downcut spiral bit for sound port pattern? |
Thanks guys. 1/4" sounds like the plan. |
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| Author: | DannyV [ Fri Mar 13, 2020 11:51 am ] |
| Post subject: | Re: What diameter downcut spiral bit for sound port pattern? |
1/8 with a 1/4 shank would be my personal preference. And fairly fresh ; ) |
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| Author: | bluescreek [ Tue Mar 17, 2020 8:01 pm ] |
| Post subject: | Re: What diameter downcut spiral bit for sound port pattern? |
never use down cuts just be sure to use a sharp one |
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