LumberJocks

Kick back on router table

  • Advertise with us

« back to Safety in the Woodworking Shop forum

Forum topic by SpikeJ posted 05-09-2011 04:58 PM 2616 views 0 times favorited 6 replies Add to Favorites Watch
View SpikeJ's profile

SpikeJ

4 posts in 1301 days


05-09-2011 04:58 PM

Topic tags/keywords: kick back router

Today I had kick back on router table. I am wondering what is the cause of this kick back.
This is the first time for me to use trim bit(whiteside#2715 which has 1-1/2 cutting length and 7/8 cutting diameter with top and bottom bearings). I cut the work piece by band saw roughly and tried to trim it by using this bit with template.
I slowed down the speed of router to 10,000 rpm because this bit was quite big trim bit.
The thickness of work piece was about 3/4. As soon as the work piece touch to the bit, the kick back happened and
work piece flied to the right side. The difference between the template and the work piece was about 1/8.
I am not sure that I feed the work piece in climb cut direction, because the kick back happened as soon as the bit touched
to the work piece. My assumption to the cause of this kick back is I tried to cut too much at once. ( as I mentioned the amount to be trim was 1/8. ) If my assumption is correct, how much is the ideal(safe) amount of one cut?


6 replies so far

View HerbC's profile

HerbC

1167 posts in 1516 days


#1 posted 05-09-2011 05:04 PM

Try using a starter pin. This give you a point to steady the workpiece when beginning your cut.

Good Luck!

Be Careful!

Herb

-- Herb, Florida - Here's why I close most messages with "Be Careful!" http://lumberjocks.com/HerbC/blog/17090

View Loren's profile

Loren

7564 posts in 2304 days


#2 posted 05-09-2011 05:07 PM

Such trimming cuts require a lot of control. The bit can take too big
a bite and catch on the wood.

I sometimes make a flat jig with the template attached to it and put
two solid handles on the jig. You have to have really positive control
of the workpiece to make trimming cuts with those long pattern bits
on the router table.

Starting pins are also very useful for beginning this type of cut successfully.

-- http://lawoodworking.com

View patron's profile

patron

13034 posts in 1997 days


#3 posted 05-09-2011 05:37 PM

a starter pin can be a bolt in one of the threaded holes for just that purpose
or i have just clamped a block of scrap of wood
(with rounded corner) to the table
on the in-feed side
not to close for more control
the idea being to put the work to the ‘pin’ first
and slowly feed it over to the cutter with bearing
holding it to the ‘pin’ till the cutter is doing it’s work
and the pattern is snug to the bearing
as you advance the work to the cutter
ease away from the ‘pin’
and work the pattern forward against the bearing
being in control
as stated above

don’t be shy holding the work solid to the bearing
but hold your hands safely away from the cutter action
and if you remove the work
always use the ‘pin’ to return to the cut again

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

View CharlieM1958's profile

CharlieM1958

15698 posts in 2875 days


#4 posted 05-09-2011 08:51 PM

I agree with David and Loren. !/8” is not too much to remove at once…. it’s starting the cut that can be tricky. A starting pin is good, as mentioned. You can do this cut successfully without one, but you must approach the bit very slowly, and with a good grip. Once the cut is started, and your pattern is tightly against the bearing, you can increase your feed rate without a problem.

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

View William's profile

William

9035 posts in 1499 days


#5 posted 05-10-2011 01:59 AM

When using this type bit, I am always careful to make sure to have a good hold of the work piece. I make sure to wear gloves, because large chunks of wood in your hand hurt like hell (yes I know this from experience). Then I make sure my body is out of the way that the wood will most likely fly if it decides to do so. I have done what you describe to several boards at a time with no problem. Then all of a sudden for no apparent reason, it’ll catch one wrong. I actually had it happen one time and it threw the board across the shop at great speed, right through a window.

-- http://wddsrfinewoodworks.blogspot.com/

View SpikeJ's profile

SpikeJ

4 posts in 1301 days


#6 posted 05-10-2011 04:09 PM

Thanks for your advises.
I tried this work again today. I hold the work piece against the starting pin and slowly let the work piece closer to the trim
bit. Fortunately first several cuts were successful. However after several cuts, I had a kick back again. It look like the bit took a bite too big. I used GRR-ripper to hold the work piece, so my fingers were safe.
At this moment this kind of big bit is very scary for me and need a lot of control. I learned that free holding routing on router table is a kind of very tricky and difficult task. I may try smaller size trim bit for my practice or will make the
well work piece holding fixture.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com

Latest Projects | Latest Blog Entries | Latest Forum Topics

GardenTenders.com :: gardening showcase