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Riving knife alignment issues

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Forum topic by athomas5009 posted 11-19-2015 05:07 PM 459 views 0 times favorited 6 replies Add to Favorites Watch
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athomas5009

293 posts in 1076 days


11-19-2015 05:07 PM

Topic tags/keywords: tip question resource tablesaw

I finally got around to ordering a replacement OEM riving knife for my GI 50-240GT cabinet saw. It arrived yesterday and I went to install it and clearly notice it’s a 16th-32ndto the right of the blade. Installation was easy and only involved loosening a wing bolt, pulling the wings / pin and dropping in the RK. After installation I looked for ways to adjustment and referred to the manual with no luck.

Anyone have any ideas? I’m kinda bummed about this because I use the TS for almost all joinery. To this point I’ve gotten by with being careful and using no splitter. But I was really excited about how this riving knife would provide extra safety and still allow me to perform most operations without removal.

-- Sometimes you're flush and sometimes you're bust, and when you're up, it's never as good as it seems, and when you're down, you never think you'll be up again, but life goes on.


6 replies so far

View Fred Hargis's profile

Fred Hargis

3925 posts in 1952 days


#1 posted 11-19-2015 07:18 PM

You said “clearly notice” it’s off. If you eyeballed it, it’s very hard to see the misalignment; did you lay a straightedge along the blade and against the knife? That’s the easiest way to see if it’s off (and by how much). There’s a lively current discussion going on about this in this thread.

-- Our village hasn't lost it's idiot, he was elected to congress.

View MrUnix's profile

MrUnix

4202 posts in 1658 days


#2 posted 11-19-2015 08:12 PM

Bend it, shim it, smack it with a hammer… whatever it takes to get it lined up. Just don’t try doing it by eye. It shouldn’t be too hard to figure out.

Or….. have you even tried to call them (or shoot them an e-mail) to ask?

Cheers,
Brad

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

View athomas5009's profile

athomas5009

293 posts in 1076 days


#3 posted 11-19-2015 08:14 PM

Yes I verified my eyes with a straight edge. The saw and fence are definitely tuned up properly. There must be some way of adjusting the riving knife.

I did some research on the topic last night and the info I found made it t seem like most riving knifes need realignment overtime but unfortunately none of the examples were my model or used the same mechanism my model does. I was just hoping someone would know the fix. I might have to post a few pics of the RK mechanism.

-- Sometimes you're flush and sometimes you're bust, and when you're up, it's never as good as it seems, and when you're down, you never think you'll be up again, but life goes on.

View OggieOglethorpe's profile

OggieOglethorpe

1209 posts in 1569 days


#4 posted 11-19-2015 08:17 PM

Grab a piece of 3/4” MDF or scrap cabinet ply, maybe 8” wide x 16-20” long, with one clean edge along the long dimension…

Raise the blade full height, set the fence about 4” wide, start the saw and with the clean edge against the fence, rip the stock until the leading edge of the stock gets to the knife edge. Stop pushing. Hold the stock still, DO NOT BACK UP, knee the saw off and wait for the blade to stop.

Lower the blade a bit to allow you to push the kerf forward so it engages the blade…

You want it to slightly favor the fence side, and the kerf should slide over the knife. SLIGHT pressure is OK on the fence side, but if you can smoothly slide the kerf along the knife sides, you’re good to go.

If you need to shim it either way, and your saw has no adjustment provision, tape works great. Just add a pad of tape at the base, where it goes into the mount, on the side of the knife you need to move away from.

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HokieKen

1734 posts in 598 days


#5 posted 11-19-2015 08:43 PM

Can you just use shimming washers? They’re simple to make out of just about anything – milk jugs, aluminum cans, soda bottles etc.

-- Kenny, SW VA, Go Hokies!!!

View OggieOglethorpe's profile

OggieOglethorpe

1209 posts in 1569 days


#6 posted 11-21-2015 02:37 PM

Can you just use shimming washers? They’re simple to make out of just about anything – milk jugs, aluminum cans, soda bottles etc.

Sure! But they’ll probably fall out every time to take the knife out. Shim stock is great when something stays assembled all the time.

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