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runners to fit in miter slot

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Forum topic by deadherring posted 02-20-2018 02:35 AM 432 views 0 times favorited 8 replies Add to Favorites Watch
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deadherring

63 posts in 1672 days


02-20-2018 02:35 AM

Hi all,

I have a Grizzly G0690 cabinet saw and recently made Make Something (on youtubes) ultimate picture frame jig.

I made the runners to fit the exact size of the top of the miter slots (3/4’s of an inch) and after a bunch of trial and error got them cut perfectly with no slop.

The problem is that the jig is big and when you first go to start the cut the bulk of the weight is off the end of the saw and the jig wants to lift off the table which of course is quite unsafe.

I realized the the miter slot accomodates for that by allowing for a “wing” on either side of the miter slot to allow for a wing to fit in on either side and prevent for the jig lifting up. See the picture below for what I mean:

My question is, is there a recommended procedure for making these runners without making myself crazy? I’m thinking I could start by using calipers to measure the distance for the bottom part of the slot (the “wings”), then when I’ve got that piece cut perfect I can set the table saw blade to the height of top part of the slot and run it over the table saw, gradually bumping the fence until I’ve got it fitting well, but I feel like I’ll need to take one pass on one side of the runner, then one on the other side of the runner to keep things even? Seems like there’s tons of margin for error and I can see myself burning through pieces of wood to get it right. Maybe make the whole thing wider than the bottom part, but the top part until I’ve got it exactly 3/4” to fit the top, then trim it down?

I also have a few other jigs that have the same problem that I’d like to correct. I feel like there’s got to be an easier way. And, I have other jigs I’d like to fix this on, so if there’s some way to create a template or something that I can reuse in the future to make this easier, that would be great.

Thanks in advance.

Nathan


8 replies so far

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Loren

10476 posts in 3676 days


#1 posted 02-20-2018 03:14 AM

I’d look at screwing Lexan/polycarbonate to the
bottom of the wood runners. It’s easy to
find at a home center.

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TungOil

945 posts in 523 days


#2 posted 02-20-2018 03:20 AM

I’ve seen folks attach some flat washers to the bottom of the runners as well.

-- The optimist says "the glass is half full". The pessimist says "the glass is half empty". The engineer says "the glass is twice as big as it needs to be"

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TheFridge

9608 posts in 1514 days


#3 posted 02-20-2018 03:42 AM

Or glue some scrap to the bottom of your pretty new ones and cut everything to fit when it’s dry.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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jerryminer

928 posts in 1470 days


#4 posted 02-20-2018 04:06 AM

You could do as you describe and make a T-shaped runner—but all you really need is a washer (or equivalent) at the leading end of your runner (no risk of tipping after the cut—if you have out-feed support). Cut a small rabbet in the end of the runner to locate the washer in the wide part of the groove and screw on a washer.

Hard to see in this picture, but same concept:

-- Jerry, making sawdust professionally since 1976

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Rich

3027 posts in 618 days


#5 posted 02-20-2018 04:13 AM

A US nickel is about the right diameter as well.

-- Half of what we read or hear about finishing is right. We just don’t know which half! — Bob Flexner

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runswithscissors

2768 posts in 2053 days


#6 posted 02-20-2018 04:20 AM

It’s sometimes hard to get both runners started correctly in the slots with the washer there. It’s easier to start the sled with the runners a little beyond the far end of the table; drop the runners into the slots, then slide it back and the washers will automatically engage properly.

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

View IantheTinker's profile

IantheTinker

237 posts in 155 days


#7 posted 02-20-2018 04:20 AM

Someone else already said this, but I figured I would lend my support for it. I have seen folks use flat washers on the bottoms of their runners, you could counter sink them a bit and offset them to one side or the other.

Although, you could also add a short infeed table to take the weight of the jig. I have seen folk do that to increase the size of jobsite saw tables.

-- “How you feeling, Roy?”... “a little unappreciated, Al...” - Die Hard

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deadherring

63 posts in 1672 days


#8 posted 02-20-2018 10:01 PM

Wow. what an awesome idea. That will save a huge amount of hassle. I’m going to try it and see if I can get it to work. I’ll report back.

Thanks guys!

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