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**Mike** · 12-23-2006, 06:07 PM

Rusty, the key to understanding up cut and down cut is this: do you want to pull the waste away from the cut? Most of the time the answer is yes. Table mounting means the direction is reversed but still pulling the waste away from your cut. This is why the up cut is the most popular of the two choices. The down cut bit pushes the waste into the cut. This is used to help prevent tear out on the top surface. A good example would be on veneered plywood to keep the veneer from pulling away from the ply. So up cut means away from the closest wood surface to the router and down is towards that surface.

Joe Lyddon · 12-23-2006, 06:33 PM

Quote:

Originally Posted by 18243015

Thanks for the replies. When I joined this forum I read that the "only dumd question is the one not asked". So here goes...The jig I'm planning to build will be on top of my router table with the bit sticking up thru the table(simular to the oak-park spacer fence). Do I want upcut or downcut bits for this?

Upcut moves the chips up toward the router... (what you want for the box joint jigs)

Downcut moves the chips away from the router...

IMHO

**bobj3** · 12-24-2006, 10:56 AM

Just a show and tell for spiral bits ▼

Hand held routers,the bit rotate clockwise, routers mounted in a table, the bit rotate counter clockwise.

Bj

roy clarke · 01-13-2007, 09:46 AM

Just take no notice of the arrows, you can view them either way.

12-23-2006, 06:07 PM	#11
Mike Senior Moderator Supreme Forum King Join Date: Nov 2004 Location: Detroit, Michigan USA Posts: 3,372 View Mike's Gallery	Report This Post! Rusty, the key to understanding up cut and down cut is this: do you want to pull the waste away from the cut? Most of the time the answer is yes. Table mounting means the direction is reversed but still pulling the waste away from your cut. This is why the up cut is the most popular of the two choices. The down cut bit pushes the waste into the cut. This is used to help prevent tear out on the top surface. A good example would be on veneered plywood to keep the veneer from pulling away from the ply. So up cut means away from the closest wood surface to the router and down is towards that surface. __________________ Mike Please edit your profile with a name and location so we can better assist you.
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12-24-2006, 10:56 AM	#13
bobj3 Forum Contributer Supreme Forum King Join Date: Jan 2006 Location: Littleton,Colorado U.S.A. Posts: 8,271 View bobj3's Gallery	Report This Post! Just a show and tell for spiral bits ▼ Hand held routers,the bit rotate clockwise, routers mounted in a table, the bit rotate counter clockwise. Bj Attached Thumbnails __________________ PodCast videos RWS on YouTube http://www.routerforums.com/86898-post1.html Besure and click on the Up Arrow key ▲ on the Youtube video, you can select other youtube videos on router tables http://www.woodworkingonline.com/?s=dovetail Machine Cut ▼ http://www.woodworkingonline.com/200...cut-dovetails/ http://www.woodworkingonline.com/woo...podcast-store/ http://www.woodshopdemos.com/menu2.htm Bob J. Last edited by bobj3; 01-14-2007 at 10:02 AM.
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01-13-2007, 09:46 AM	#14
roy clarke Registered User New Member Join Date: Jan 2007 Posts: 3 View roy clarke's Gallery	Report This Post! Just take no notice of the arrows, you can view them either way.
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