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R4512 - Riving knife very loose

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Forum topic by lumberjoe posted 03-04-2013 01:10 AM 1002 views 0 times favorited 6 replies Add to Favorites Watch
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lumberjoe

2893 posts in 1710 days


03-04-2013 01:10 AM

I noticed lately I have been having a really hard time clamping down my riving knife after blade changes. I took the back off the saw today to clean things out and noticed the riving knife armature is REALLY loose – I probably have a solid 3/4” play from left to right.

Two questions -

1 – If anyone with an R4512 can take a look at theirs and see if there is a nut on the bottom of the armature that attaches the lower arm to the cast iron, that would be appreciated. It appears to be a threaded rod, but I’m not sure if there should be a nut there

2 – Any other ideas?

-- https://pinepointwoodworks.wordpress.com/


6 replies so far

View pwalter's profile

pwalter

79 posts in 2046 days


#1 posted 03-04-2013 04:21 AM

Hey Joe. I also have a r4512 and have a heck of a time getting the riving knife clamped in. If i remember, i will take a look at mine tomorrow.

View Sodabowski's profile

Sodabowski

2308 posts in 2295 days


#2 posted 03-04-2013 11:14 AM

2 – do you think you can shim the thing to get the play out?

-- Thomas - Pondering the inclusion of woodworking into physics and chemistry classes...

View me5269's profile

me5269

43 posts in 1629 days


#3 posted 03-04-2013 01:19 PM

Hi Joe,
Here’s a link to the parts diagram and list. Mine is hard to push down (and lift up), I use the end of a hammer to push it down. There is some adjustment play in it when the lever is up.
Mike

-- Mike

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lumberjoe

2893 posts in 1710 days


#4 posted 03-04-2013 01:31 PM

Thanks mike. I did find the parts diagram and it looks like everything is there. The side-to-side play does not change when the riving knife is locked down on my saw

-- https://pinepointwoodworks.wordpress.com/

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me5269

43 posts in 1629 days


#5 posted 03-04-2013 01:34 PM

By any chance is the clamp assy (item #43) loose? Not sure if you check the spring and spring seat (item #41 & 42). maybe spring is broken/missing? just guessing

-- Mike

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lumberjoe

2893 posts in 1710 days


#6 posted 03-04-2013 05:55 PM

I fixed the issue with the wiggly armature. There are 3 set screws behind the blade arbor. I tighten them down (PITA as only half the hole is exposed) and that took all of the wiggle out. The lock down is still absurdly difficult. I disassembled the whole thing, cleaned it (it actually wasn’t that dirty because I am anal about keeping the saw clean) and it made no difference at all.

-- https://pinepointwoodworks.wordpress.com/

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