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Riving knife with cross cut sled?

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Forum topic by CTW posted 07-30-2015 10:38 PM 1050 views 0 times favorited 15 replies Add to Favorites Watch
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CTW

48 posts in 774 days


07-30-2015 10:38 PM

Topic tags/keywords: jig question tablesaw

My only acess to teachers are online (like many other beginners). I am in the process of completing my first successful ♡ (I hope) crosscut sled. I have never seen or heard of anybody using their riving knife with a sled but when Mr. Ng mentioned potential kick-back while using a sled in his vdeo I started wondering whether it should be used.

I would really like some input from someone who has a good understanding of this issue.

Thanks, CTW


15 replies so far

View MrUnix's profile

MrUnix

4225 posts in 1663 days


#1 posted 07-30-2015 10:47 PM

Completely unnecessary with a sled (or when using a miter guage for that matter). Doesn’t mean you can’t still use it though if you feel the need.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View runswithscissors's profile

runswithscissors

2189 posts in 1489 days


#2 posted 07-31-2015 12:01 AM

The rk might help prevent the offcut from drifting into the back of the blade.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View DKV's profile

DKV

3940 posts in 1968 days


#3 posted 07-31-2015 12:57 AM

runs, help me with the physics behind your statement.

-- This is a Troll Free zone.

View Redoak49's profile

Redoak49

1951 posts in 1452 days


#4 posted 07-31-2015 01:10 AM

I leave the riving knife in all the time . The only time I take it out is when cutting a groove as mine is a little higher than the blade.

View Steve Peterson's profile

Steve Peterson

324 posts in 2546 days


#5 posted 07-31-2015 01:22 AM

Redoak49, it sounds like you have a splitter instead of a true riving knife. Either that or something isn’t adjusted properly. A true riving knife should travel with the blade and would always be slightly lower.

-- Steve

View Woodmaster1's profile

Woodmaster1

737 posts in 2051 days


#6 posted 07-31-2015 01:30 AM

I leave mine on because I am too lazy to take it off. The sled works just fine without removing the knife.

View Gixxerjoe04's profile

Gixxerjoe04

835 posts in 1040 days


#7 posted 07-31-2015 03:12 AM

If my saw had a riving knife I would keep it on, I have crosscut some pieces of lumber that had tension pulling it back into the blade, but that happened before all the way through and I pulled it back out thankfully.

View CTW's profile

CTW

48 posts in 774 days


#8 posted 07-31-2015 04:02 AM

Thanks for the input. I know the riving knife is supposed to keep the wood behind the blade from squeezing together and climbing the blade and kicking back, but for some reason I didn’t think cross cutting. presented that risk. But I don’t know why.

View MrUnix's profile

MrUnix

4225 posts in 1663 days


#9 posted 07-31-2015 04:11 AM

Check out Matthias trying to get a kickback:
Table saw kickback from crosscuts - an experiment

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View CTW's profile

CTW

48 posts in 774 days


#10 posted 07-31-2015 04:25 AM

Thank you. I will do that.

View Tomoose's profile

Tomoose

410 posts in 2837 days


#11 posted 07-31-2015 04:35 AM

My riving knife doesn’t interfere with my sled at all, so I just leave it on. I have not encountered an instance where I would need to remove it, but that is not to say that situation is not a possibility.

Tom

-- “I am always doing that which I cannot do, in order that I may learn how to do it.” Pablo Picasso

View rwe2156's profile

rwe2156

2193 posts in 944 days


#12 posted 07-31-2015 11:21 AM

If you have a riving knife why would you even take it off when using a sled?

Am I missing something?

-- Everything is a prototype thats why its one of a kind!!

View Redoak49's profile

Redoak49

1951 posts in 1452 days


#13 posted 07-31-2015 11:27 AM

Steve….I have a Sawstop PCS and yes it is a true riving knife. Some of my blades have been sharpened a couple of times and yes the RIVING knife is slightly higher than the blade on some of them.

View CTW's profile

CTW

48 posts in 774 days


#14 posted 07-31-2015 05:45 PM

Red, I also have the Sawstop pcs – so if (when) I have questions about it I may be asking you.

View patcollins's profile

patcollins

1420 posts in 2329 days


#15 posted 08-05-2015 12:45 AM

The wood pinches while ripping the length of the grain because of internal stresses are released from cutting out a section of the wood. It may want to twist, both sides of the cut may want to come together or even spread apart.

These stresses don’t exist across the grain, nor do they exist in homogeneous material like MDF, particle board, or plastic.

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