Router bit with fishtail tip

Router bit with fishtail tip

Postby kak » Wed Oct 25, 2017 7:19 pm

I have one of them, 3mm and I like it.
I only get one hit when I google "fishtail router bit".
The cutting edges are crossing like an X at the tip, so it's cutting with the shoulders.

Do you know another name for that bit?
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Re: Router bit with fishtail tip

Postby Adrian » Wed Oct 25, 2017 8:03 pm

This question came up the other day. See my reply here - viewtopic.php?f=2&t=28339&p=204852
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Re: Router bit with fishtail tip

Postby ger21 » Wed Oct 25, 2017 8:42 pm

2 flute upcut spiral router bit.
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Re: Router bit with fishtail tip

Postby Leo » Wed Oct 25, 2017 8:54 pm

Actually I did not know such a geometry was available. It's new to me. I don't know how long this has existed.

I googled Router Bit with fishtail and a lot popped up.

Interesting, I will try this over the winter.
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Re: Router bit with fishtail tip

Postby Rcnewcomb » Wed Oct 25, 2017 9:21 pm

Be aware that these are fine for profile cuts but for pocketing they can tend to leave swirl marks on the bottom of the pocket.
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Re: Router bit with fishtail tip

Postby Leo » Wed Oct 25, 2017 10:02 pm

Ohhh, I am very much aware that this is NOT a good geometry for a nice smooth flat bottom.

For hole making where the hole size is controlled via circular interpolation is where I see something this.

Nice smooth flat bottom pocketing is another whole process discussion.
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Re: Router bit with fishtail tip

Postby scottp55 » Fri Oct 27, 2017 4:08 pm

Very good for CLEAN sidewall cuts, and leaves a little "tooth" on pocket bottoms for gluing dense oily woods. Seem to have a cleaner top edge with less splintering, and very clean bottom on drill throughs/cutouts. I only have used the .117" though from here;
http://www.precisebits.com/products/carbidebits/precisebit-soft.asp
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