What is the purpose of left hand cut router bits?

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Forum topic by TopamaxSurvivor posted 01-27-2011 09:10 PM 8967 views 0 times favorited 22 replies Add to Favorites Watch
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18390 posts in 3876 days

01-27-2011 09:10 PM

Topic tags/keywords: left hand router bits reversible

What is the purpose of left hand cut router bits? Are there reversible routers?

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

22 replies so far

View ajosephg's profile


1880 posts in 3761 days

#1 posted 01-27-2011 09:29 PM

Looks like they are used in production machines like this CNC door edge mortising machine. It has two motors, one right handed rotation and one left hand. “The computer automatically selects the proper motor to cut into the door to eliminate chipout and then switches to the second motor, if necessary, to prevent chipout at the other end of the cut.”

I didn’t know this until you asked and got my curiosity going. So, I learned something today.

-- Joe

View CharlieM1958's profile


16281 posts in 4418 days

#2 posted 01-27-2011 09:30 PM

From the Tyler Tool website:

Left hand cutters are used in routers that can run in reverse for special applications. Left hand cutters are most often used in industrial applications. Requires left arbors.

-- Charlie M. "Woodworking - patience = firewood"

View Dez's profile


1166 posts in 4277 days

#3 posted 01-27-2011 09:30 PM

I’ve never seen one although they could be used in a shaper, most are reversible.

-- Folly ever comes cloaked in opportunity!

View JuniorJoiner's profile


488 posts in 3640 days

#4 posted 01-27-2011 09:42 PM

the use I can think of is if you have a combo jointer planer machine that has the horizontal morticing attachment, the drive is off the jointer head, thus would be cutting opposite of a normal router.

-- Junior -Quality is never an accident-it is the reward for the effort involved.

View degoose's profile


7245 posts in 3555 days

#5 posted 01-27-2011 10:37 PM

You are all wrong …. they are for use down under….

-- Don't drink and use power tools @

View TopamaxSurvivor's profile


18390 posts in 3876 days

#6 posted 01-27-2011 10:40 PM

Sheesh!! I should have known that :-)

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View patron's profile


13640 posts in 3541 days

#7 posted 01-27-2011 10:49 PM

so at the equator
they can’t use routers
as the bits don’t cut in either direction ?

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View jim C's profile

jim C

1472 posts in 3298 days

#8 posted 01-27-2011 11:18 PM

your all wrong. They’re for putting the wood back on.

View Dan Lyke's profile

Dan Lyke

1520 posts in 4325 days

#9 posted 01-28-2011 12:01 AM

david, at the equator they’re reduced to just using planes.

-- Dan Lyke, Petaluma California,

View tyskkvinna's profile


1310 posts in 3186 days

#10 posted 01-28-2011 01:45 AM

I use left-hand router bits on my CNC router fairly often.

-- Lis - Michigan - -

View rogerw's profile


262 posts in 2889 days

#11 posted 01-28-2011 01:46 AM

larry- the blades are straight out for use on the equator. lol.

I have often pondered on the question about toilets on the equator. the northern hemisphere the water goes ccw and down under it goes cw. Does it just go straight down on the equator???

I once worked with a girl that went to australia on vacation for two weeks. i asked her when she got back about the toilets. she said she never paid any attention. WHAT !? That would have been the first thing i would have done when i got off the airplane! go find the bathroom!

-- >> my shop teacher used to say "do the best at everything you make for your mom because you're going to see it for the rest of your life!" <<

View Justin's profile


119 posts in 3169 days

#12 posted 01-28-2011 02:00 AM

I know with line boring machines there is a left and a right hand bits (orange and black bits)Line Boring Bits but i never had any experience with left handed router bits or slot mortising bits.

View ND2ELK's profile


13495 posts in 3974 days

#13 posted 01-28-2011 03:21 AM

My Shaper can use router bits and has a forward and reverse motor. Sometimes running a piece of wood in a different direction might prevent tear out, and a smoother/safer feeding of a piece.

-- Mc Bridge Cabinets, Iowa

View oluf's profile


260 posts in 3239 days

#14 posted 01-28-2011 03:22 AM

Don’t forget the Dewalt radial arm saws that used a router bit adaptor on the motor shaft for overhead routing.

-- Nils, So. Central MI. Wood is honest.Take the effort to understand what it has to tell you before you try to change it.

View TopamaxSurvivor's profile


18390 posts in 3876 days

#15 posted 01-28-2011 04:10 AM

I don’t think i have ever heard of a small router with a reverse. Has anyone else? They must be just for CNC and other larger machinery, eh?

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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