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What's The Difference Between These Bits?

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Forum topic by Mean_Dean posted 1634 days ago 1711 views 0 times favorited 7 replies Add to Favorites Watch
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Mean_Dean

1353 posts in 1773 days


1634 days ago

A pattern bit, and a flush-trim bit?

It seems to me that one has a bearing on top, and one has a bearing on the bottom. So what’s the difference between them, and which one is best for what use?

Thanks in advance!

-- Dean


7 replies so far

View Alexander's profile

Alexander

190 posts in 1737 days


#1 posted 1634 days ago

I don’t know either. Maybe it is, one for a hand held router and another for a table mount router. I’ll be checking back to find out.

-- John at Sugarloft Mountain........Don't argue with an idiot; people watching may not be able to tell the difference.

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bigike

4031 posts in 1914 days


#2 posted 1633 days ago

a flush trim bit is good for flushing edges to one another a ptern bit is good for template routing and both can be used in either handheld or table mt routers.

-- Ike, Big Daddies Woodshop, http://www.icombadaniels@yahoo.com

View tooldad's profile

tooldad

657 posts in 2340 days


#3 posted 1633 days ago

just a classification difference. I use a flush trim bit when I make a pocket hole face frame. I oversize it just slightly then it can be trimmed exactly flush.

a pattern bit is used when you double stick tape a pattern to a blank and router the shape. this way the pattern can be on top.

when we make adiorndack chairs in the shop classes, we use screws to hold the pattern down, so we use a flush trim bit (bearning on bottom) with a router table. this way the student can see the pattern and the screws are on top and not holding the board up.

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Ger21

622 posts in 1757 days


#4 posted 1633 days ago

Also, a pattern bit can cut mortises, a flush trim can’t. Both do basically the same thing, but different. :-)

-- Gerry, http://home.comcast.net/~cncwoodworker/CNC_Woodworker.html

View SnowyRiver's profile

SnowyRiver

51451 posts in 2106 days


#5 posted 1633 days ago

A pattern router bit has the bearing on the top of the cutter, and a flush trim bit has it on the bottom. A flush trim bit works best for triming the top of lets say a counter top flush with the edging, where a pattern bit like it says can follow a pattern that can be clamped to the top of the work piece and trim the lower piece to the pattern detail.

-- Wayne - Plymouth MN

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closetguy

744 posts in 2518 days


#6 posted 1633 days ago

I use a Rockler bit with bearings on both the top and bottom. I use it for flush trim and pattern following. With bearings on both ends, you have a choice of using a pattern on top or bottom of the piece.

-- I don't make mistakes, only design changes....www.dgmwoodworks.com

View alanealane's profile

alanealane

365 posts in 2516 days


#7 posted 1633 days ago

As an electric guitar/bass builder, I know that pattern bits (with the bearing between the cutter and the shank) can be used to rout the cavities/pockets that house the electronics and the pickups. They also can be used to make the cavity that houses the neck on instruments with a bolt-on neck design. These are blind (or stopped) cuts that don’t go completely through the thickness of the wood I’m routing, therefore I need the bits that only have the bearing on the top.

I’m usually a proponent of avoiding templates and patterns when building my pieces, but when it comes to features that need to be a consistently standard size, pattern bits and a template can be very useful.

-- Lane Custom Guitars and Basses

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