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Another Router Bit question...this time about spiral bits.

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Forum topic by SteveC3606 posted 10-28-2009 06:47 PM 862 views 0 times favorited 5 replies Add to Favorites Watch
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SteveC3606

8 posts in 2604 days


10-28-2009 06:47 PM

Topic tags/keywords: router bits spiral bits router

When should I think about using an upspiral bit? a downspiral bit? can these bits be used with a guide bushing?

-- Stevec3606


5 replies so far

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a1Jim

115202 posts in 3038 days


#1 posted 10-28-2009 06:55 PM

Spiral bits are great the direction has to do with which way you want the chips to go . Yes the can be used with a guide bushing. You can use them any time you would be using a straight bit they are great bits and usually reduce the amount of tear out you get.

-- http://artisticwoodstudio.com Custom furniture

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SteveC3606

8 posts in 2604 days


#2 posted 10-28-2009 06:57 PM

Thanks Jim.

-- Stevec3606

View LesB's profile

LesB

1235 posts in 2904 days


#3 posted 10-28-2009 07:01 PM

One of the main differences in up and down is the way it affects the edges of the cut. Up spiral will lift the fibers along the edge sometimes leaving them rough. Down will shear the fibers in a downward cut leaving a cleaner cut. The up spiral tends to pull the bit down and visa versa for the down spiral.
There are spiral bits that have a combination with the first portion being up and the upper part being down giving the best of both functions. I haven’t tried them but the idea looks good, except they are more expensive.

I don’t see any problem using a guide bushing with spiral bits. I do it all the time.

-- Les B, Oregon

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a1Jim

115202 posts in 3038 days


#4 posted 10-28-2009 07:10 PM

A much better explanation of spiral bits Les well done

-- http://artisticwoodstudio.com Custom furniture

View reggiek's profile

reggiek

2240 posts in 2731 days


#5 posted 10-28-2009 07:11 PM

Also, it depends on what face you are cutting on….the up spiral with make the bottom side clean cut…whereas the down will do the opposite. You also want to use a down spiral when cutting a grove in the face of the wood as it will leave the open edges cleaner….I have both and use them alot….I use them with guide bearings and without..with no problems….they are just as good as bearing guided trim bits…but of course more expensive.

-- Woodworking.....My small slice of heaven!

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