Upcut Downcut - Router Forums
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post #1 of 20 (permalink) Old 08-15-2015, 12:11 PM Thread Starter
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Can someone give me a beginner's explanation of when to use an upcut and when to use a downcut bit? For starters, am I correct that upcut moves the sawdust towards the router?
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post #2 of 20 (permalink) Old 08-15-2015, 12:14 PM
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Upcut pulls the chips towards the router so use if it's a blind hole/slot

Downcut pushes chips away so use for through slot or trimming.

When everything around you is going to pot, get out in the workshop.
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post #3 of 20 (permalink) Old 08-15-2015, 12:14 PM
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Mike I want to see if I remembered . An uncut bit forces the wood out evacuating the hole better out of the material , but for laminate you want a down cut as it would have less of a chance of chipping the melamine etc.
let's see how close I am lol

Ok I posted a few seconds to late and got beat
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post #4 of 20 (permalink) Old 08-15-2015, 12:20 PM
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tes on the saw dust removal...

see if this helps...
Attached Files
File Type: pdf SPIRAL BITS.pdf (202.7 KB, 126 views)
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post #5 of 20 (permalink) Old 08-15-2015, 12:27 PM Thread Starter
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And here goes the confusion. Angie says, "Upcut pulls the chips towards the router so use if it's a blind hole/slot". The PDF that Stick posted says, "DOWNCUT Bits (naturally) cut downward (away from the router base). This motion gives grooves, dadoes, rabbets, shallow mortises and plunge cuts a smooth clean edge. REMEMBER: Downcut bits push sawdust into the cut. Making multiple passes reduces the buildup of sawdust in the groove."

Wouldn't a dado be a slot? It seems that these two recommendations are at odds with each other, and Angie's recommendation makes more sense to me.

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post #6 of 20 (permalink) Old 08-15-2015, 12:39 PM
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If you use a downcut to cut a dado (non-through slot) the corners are not raised by an upcut, so are smootherwith less to no whiskers. The problem that can occur is sawdust buildup in the slot.

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post #7 of 20 (permalink) Old 08-15-2015, 12:47 PM
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@patlaw

Mike you could always get an upcut-downcut bit (called a compression bit), best of both worlds. They do seem to be a little on the expensive side for a hobbyist like me though

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post #8 of 20 (permalink) Old 08-15-2015, 12:54 PM
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It was so nice and easy when everyone could see all the sticky threads on the main menu.

Hope this helps people.

http://www.routerforums.com/router-b...tml#post505441
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post #9 of 20 (permalink) Old 08-15-2015, 02:19 PM
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An upcut makes a cut towards the router, the downcut away...

Upcut clears sawdust in a blind slot, downcut makes a clean edge on the face closest to the router, upcut makes a clean edge on the face away from the router.

...so which way do you want the sawdust to go and which face do you want cleanest...both are allowed...

Compression bits clean both ways and leave a clean cut on both faces (if aligned properly and through-cut)...they come in different lengths...

Downcut in a mortise will give you a clean cut but will not clear sawdust very well...bit will heat up faster...Upcut will clear the sawdust, leave a bit of fuzz but can be sanded and hidden by the shoulder of the tenon... (eeeuwww)...everybody hides bellybutton fuzz...

...it's up to the imagination...

...did ya learn me right, roomies...?
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post #10 of 20 (permalink) Old 08-15-2015, 02:21 PM
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Quote:
Originally Posted by Mike View Post
It was so nice and easy when everyone could see all the sticky threads on the main menu.

Hope this helps people.

http://www.routerforums.com/router-b...tml#post505441
...change is inevitable..."resistance is futile"...

It used to be "ars gratia artis"...nowadays it's (tech gratia techis)

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Points to Ponder...

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TIME - the thing that gets in the way of learning.
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