I had been using a standard 2-flute flush trim bit for some template
routing. Cut quality had been pretty good - but this weekend I had one
experience with terrible tear-out that ruined the piece. A bit like this:
http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+34
I think I recall seeing The Wood Works Guy (David Marks) use a spiral flush
trim bit (like
http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+98). But
memory fails me.
Wondering, in general, will I get a higher quality cut (less prone to tear
out) by switching to a spiral flush trim bit? I'm willing to invest the
extra bucks if the payoff comes back in cut quality.
Might be that stage cutting would have cut down on the tearout.
Have seen serious tearout with every type of flute design.
More on templet cutters and stage cutting at the
http://www.patwarner.com/patternbits.html link.
*******************************************************
> I had been using a standard 2-flute flush trim bit for some template
> routing. Cut quality had been pretty good - but this weekend I had one
> experience with terrible tear-out that ruined the piece. A bit like this:
> http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+34
>
> I think I recall seeing The Wood Works Guy (David Marks) use a spiral flush
> trim bit (like
> http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+98). But
> memory fails me.
>
> Wondering, in general, will I get a higher quality cut (less prone to tear
> out) by switching to a spiral flush trim bit? I'm willing to invest the
> extra bucks if the payoff comes back in cut quality.
Where was your tear-out? If it was on a cross-grain cut, you should have better
luck with a spiral. Or back up your workpiece with a piece of scrap. But a
spiral can tear out (albeit minimally), along the top or bottom depending upon
it's type (i.e. upcut or downcut). Tom
>Subject: Q: Best type of Flush Trim
bit?
>From: "mttt" [email protected]
>Date: 12/08/2003 3:25 PM US Mountain Standard Time
>Message-id: <[email protected]>
>
>I had been using a standard 2-flute flush trim bit for some template
>routing. Cut quality had been pretty good - but this weekend I had one
>experience with terrible tear-out that ruined the piece. A bit like this:
>http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+34
>
>I think I recall seeing The Wood Works Guy (David Marks) use a spiral flush
>trim bit (like
>http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+98). But
>memory fails me.
>
>Wondering, in general, will I get a higher quality cut (less prone to tear
>out) by switching to a spiral flush trim bit? I'm willing to invest the
>extra bucks if the payoff comes back in cut quality.
>
Someday, it'll all be over....
I found a 3-fluted flush trim bit, I really like it. slightly less
tear out. Damned if I can remember what the brand name was- sorry.
-Dan V.
On Mon, 08 Dec 2003 22:25:16 GMT, "mttt" <[email protected]>
wrote:
>I had been using a standard 2-flute flush trim bit for some template
>routing. Cut quality had been pretty good - but this weekend I had one
>experience with terrible tear-out that ruined the piece. A bit like this:
>http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+34
>
>I think I recall seeing The Wood Works Guy (David Marks) use a spiral flush
>trim bit (like
>http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+98). But
>memory fails me.
>
>Wondering, in general, will I get a higher quality cut (less prone to tear
>out) by switching to a spiral flush trim bit? I'm willing to invest the
>extra bucks if the payoff comes back in cut quality.
>
>
I have had good luck with a 3 bit system. I use a 1/2 spiral milling
machine cutter (either 2 flute or 4 flute) with a template guide bushing.
That does away with most of the waste and leaves only a small amount to
remove. I then have a flush cut bit and a pattern bit. I pay close
attention to the grain direction and flip my work and template over so that
I are always routing with the grain. That avoids most of the big tearout
problems. I also pay attention to the grain direction when I am doing the
initial routing because it is easy to rip out a big hunk of material if you
go the wrong way against the grain.
--
dbchamber at hotmail spam dot com
Remove the spam to reach me
> >From: "mttt" [email protected]
> >Date: 12/08/2003 3:25 PM US Mountain Standard Time
> >Message-id: <[email protected]>
> >
> >I had been using a standard 2-flute flush trim bit for some template
> >routing. Cut quality had been pretty good - but this weekend I had one
> >experience with terrible tear-out that ruined the piece. A bit like
this:
> >http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+34
> >
> >I think I recall seeing The Wood Works Guy (David Marks) use a spiral
flush
> >trim bit (like
> >http://www.routerbits.com/cgi-routerbits/sr.cgi?1070919921_32526+98).
But
> >memory fails me.
> >
> >Wondering, in general, will I get a higher quality cut (less prone to
tear
> >out) by switching to a spiral flush trim bit? I'm willing to invest the
> >extra bucks if the payoff comes back in cut quality.
> >
> Someday, it'll all be over....