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table saw riving knife

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Forum topic by Karda posted 06-21-2021 03:56 AM 535 views 0 times favorited 26 replies Add to Favorites Watch
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Karda

3241 posts in 1712 days


06-21-2021 03:56 AM

Hi, the riving knife falls down to hit the blade because I can’t tighten the bolt tight enough. The bolt is a bolt with a single wing so I can’t use a wrench, could i replace it with a hex head bolt so i can use a wrench


26 replies so far

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SMP

4437 posts in 1064 days


#1 posted 06-21-2021 04:53 AM

You’ve probably spent way more time and money on that saw by now that you should have just tossed it and gotten a decent saw on craigslist. Would have been cheaper by now and less dangerous.

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Karda

3241 posts in 1712 days


#2 posted 06-21-2021 05:02 AM

ditching the saw is not an option, if i got one on craigs list it could be more trouble that the one I have. I have a very poor track record when I buy used machinery

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Kudzupatch

248 posts in 2367 days


#3 posted 06-21-2021 02:21 PM

Yes. Most likely you can. If nothing is in the way or will hit it.

Only you can say for sure since we can’t see it. Just use a lock washer to keep it from coming loose.

-- Jeff Horton * Kudzu Craft skin boats* www.kudzucraft.com

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controlfreak

2487 posts in 760 days


#4 posted 06-21-2021 02:39 PM

A riving knife coming in contact with the blade sounds very dangerous to me. If you are going to keep using you may want to invest in a full face shield that is impact resistant. I am not trying to be a smart a$$ here.

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Karda

3241 posts in 1712 days


#5 posted 06-21-2021 03:45 PM

the question was will a hhex head bolt work ok. I know it is dangerous only because I can’t tighten it tight enough by hand

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controlfreak

2487 posts in 760 days


#6 posted 06-21-2021 03:59 PM

May want a lock ring and a nut with a nylon bushing to counter the saws ability to vibrate the nut or bolt loose. It may also be possible to drive a pin in the knife to limit forward movement in the event it does get loose. I would make a check on the firmness of hold before starting saw each time.

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tvrgeek

2077 posts in 2808 days


#7 posted 06-21-2021 05:18 PM

Guess I don’t know the history here so I am not going to bash you for trying to fix your saw.
But some detail here woudl help. It does not make sense the original design does not work, so maybe something else is amiss. Picture? What saw? History?

I imagine a hex bolt is fine, but I question why it would be needed.

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Kudzupatch

248 posts in 2367 days


#8 posted 06-21-2021 05:35 PM

All this brings up a good point.

There should be a stop of some type that will prevent the knife from sliding into the blade if the bolt come loose. NOT JUST THE BOLT. Even with a tight bolt it is not hard to bump it and cause it to hit the blade. Remember the blade is spinning at you it could launch the knife in your face at around 100 mph.

I got hit on the thumb by a small piece of cedar this way and it made my thumb look like ground hamburger. A can not imagine what something with some weight like a riving knife would do.

If you don’t have a stop of some sort, BESIDES the one bolt I would not use that saw. I would expect the force of flying knife would be enough to kill you and the least cause a very serious head injury.

-- Jeff Horton * Kudzu Craft skin boats* www.kudzucraft.com

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vjc

22 posts in 1545 days


#9 posted 06-21-2021 06:20 PM

Agree with Kudzupatch – relying on just one bolt to prevent knife from hitting glade is asking for trouble. My guess is that something is missing.

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CaptainKlutz

4667 posts in 2653 days


#10 posted 06-22-2021 01:27 AM

yes, you can replace the lever handle with bolt. Assuming you mean something like this? Will not be very convenient?
Might want to replace it with a star knob that might easier for you to tighten with low hand strength?

Best Luck.

-- If it wasn't for bad luck, I wouldn't have no luck at all, Doom, despair, agony on me… - Albert King - Born Under a Bad Sign released 1967

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Karda

3241 posts in 1712 days


#11 posted 06-22-2021 01:49 AM

if you look at the pictures you will see there is only room for a hex nut. It will not be inconvenient because i am not a production wood worker. I don’t have a dado set nor do i change blades and if i did it wouldn’t be often. I looked at the saw and the owners manual and there is nothing that hold the knife except that one wing nut that is in an almost unreachable place, to begin with it is hard to tighten because of the awkward placement. I appreciate you concern and suggestions but remember this is a newer craftsman and cheap

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Kudzupatch

248 posts in 2367 days


#12 posted 06-22-2021 12:56 PM

I strongly suspect there is something missing here. No manufacturer is going to release a product to the market where there is that big of a risk of injury.

Looking at photos on the computer doesn’t tell me enough to know how it is designed. It may be fine as is but from what you have said, if it is true, I wouldn’t make a single cut on this saw.

The fact you are a hobbyist will not matter in the least if that knife ever slips into the spinning blade.

Your life, your choice. I wish you LOTS of luck.

-- Jeff Horton * Kudzu Craft skin boats* www.kudzucraft.com

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Axis39

518 posts in 755 days


#13 posted 06-22-2021 01:48 PM

The tightening handle on my riving knife is also a single wing. It’s covered in rubber, so it’s easier on your hands, but it isn’t very long and can be tough to tighten.

I will take a soft block of wood as a beating block and will give it a light tap with a rubber mallet. Works every time.

-- John F. SoCal transplant, chewer uppper of good wood

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Karda

3241 posts in 1712 days


#14 posted 06-22-2021 03:58 PM

ok, I might try pliers as well, that will give leverage I don’t have with my hands

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tvrgeek

2077 posts in 2808 days


#15 posted 06-22-2021 06:19 PM

Strange design. ( actually terrible design) Long slot. Do you have to adjust it when you change height? Not moving with the blade? Looks like one could put in a lower stud as a guide.

A hex would of course work, but why is it coming lose? Maybe include a bevel washer.

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