Miter Jig for Radial Arm Saw

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Project by NBeener posted 04-16-2011 04:08 AM 33532 views 13 times favorited 17 comments Add to Favorites Watch

I’m pretty conscious of the fact that LOTS of people simply set up their RAS to do a perfect 90 degree crosscut, and then leave it there—building jigs for other types of cuts. There’s some sound logic there.

[David (Patron) is rather a genius at this sort of thing, by the way. HIS RAS table has a totally funky, totally cool, totally ingenious, and totally functional system for setting miter angles !]

So … though I’m not totally convinced I’ll take that route … a jig or two won’t hurt, either way.

Here’s the miter jig.

I’ll likely either slice it right in half—right at the intersection of the two “cleats—” or … put a kerf cut about 10” into the 14” deep board.

Or … just cut half-way through (1/8”) the ply, and leave it just as it sits (probably what I’ll do).

It’s 1/4” plywood with a couple of 1.5” x 1.5” oak cleats that I ripped from scrap, and jointed until they were pretty much perfect.

Marked out my 45-lines, set up the cleats, checked square a couple of times, then glued them down, and secured them with a couple of brads (Hi, Norm !).

It measures out at a perfect 90, with my Incra square, my Groz square, my Swanson Speed Square, AND my rafter square (they’re all in one spot, so—anal though it is—I figured I’d check and re-check, any way I could !).

I did NOT put a fence ON (attached TO) the back of this (often done, in order that you can replace the RAS fence WITH the miter jig fence, for stability).

Instead, I’ll do one of two things, or both:

- put self-adhesive 150-grit sandpaper on the bottom of the plywood, or
- just clamp the sucker down onto my RAS table

Thanks for stopping by :-)

-- -- Neil

17 comments so far

View Beginningwoodworker's profile


13345 posts in 5135 days

#1 posted 04-16-2011 04:17 AM

Neil, thats a nice jig. I may do one for my RAS. Once I build a new table.

View patron's profile


13722 posts in 4804 days

#2 posted 04-16-2011 05:04 AM

well done neil

only thing you might do in practice however
is put s ‘leader board’ behind it to the fence
so you can still crosscut parts to miter on it

that can still be done before you use this jig
and just have a pile of boards ready to miter

glad you got the saw up and running
looking good

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

View Tim_456's profile


173 posts in 5058 days

#3 posted 04-16-2011 05:16 AM

looks great! thanks for sharing!

View grizzman's profile


7836 posts in 4766 days

#4 posted 04-16-2011 06:49 AM

yea whooo, im liking to seeing this saw up and going…ready for some fancy cuts…on some fancy projects…let the good times roll

-- GRIZZMAN ...[''''']

View Dennisgrosen's profile


10880 posts in 4578 days

#5 posted 04-16-2011 10:30 AM

before you know it Rastesarous won´t work before you build a new fancy Jiig every time

take care

View ellen35's profile


2750 posts in 4895 days

#6 posted 04-16-2011 11:27 AM

Nice jig, Neil.

-- "Don't let the perfect be the enemy of the good." Voltaire

View Woodbutcher3's profile


463 posts in 4349 days

#7 posted 04-16-2011 12:57 PM

What really snapped my eye to this project is I have the same RAS. I inherited from my father. Where did yours come from?

-- Rod ~ There's never enough time to finish a project, but there's always time to start another one.

View Napoleon's profile


788 posts in 4272 days

#8 posted 04-16-2011 01:43 PM

Thats a nice jig Neil,and that saw could easyli stand in my shop :)

I put a saw like that on my wich list :)

Well done

-- Boatbuilder&blacksmith

View clieb91's profile


4267 posts in 5397 days

#9 posted 04-16-2011 04:05 PM

Neil, Thanks for posting. I just this week got my RAS at work going. Will keep this in mind as I will be ing a lot of 45 degree cuts on sign posts.


-- Chris L. "Don't Dream it, Be it."- (Purveyors of Portable Fun and Fidgets)

View woody57's profile


650 posts in 4890 days

#10 posted 04-16-2011 04:59 PM

Great idea
I also like the radiator hose dust collection hook up
I might give that a try

-- Emmett, from Georgia

View Ken90712's profile


18113 posts in 4651 days

#11 posted 04-16-2011 05:07 PM

Nice job, very cool saw & I love the dust hose LOL from the Auto Parts store? Too cool.

-- Ken, "Everyday above ground is a good day!"

View lew's profile


13534 posts in 5218 days

#12 posted 04-16-2011 05:12 PM


Years ago, Sears sold a small, metal “picture frame” jig very similar to this. A real advantage, to what you’ve made, is that even if there is a slight variation in the saw angle it is canceled out by cutting the rite and left members of a frame so you still end up with a perfect 90 degree corner.

Thanks for posting.


-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View Dusty56's profile


11868 posts in 5150 days

#13 posted 04-16-2011 05:27 PM

Very nice jig , Neil : )

-- I'm absolutely positive that I couldn't be more uncertain!

View Jim Bertelson's profile

Jim Bertelson

4275 posts in 4627 days

#14 posted 04-16-2011 06:26 PM

A similar jig is on my to do list. Haven’t decided on the design yet, but patron’s suggestion sounds good. I tend to build jigs as I come upon a need. The exception is the super sled which gets used so often that it just got built soon after the saw was tuned up. Between my fast on and off modified guard and the super sled location (right behind me) I can put the sled on the saw in less than a minute, and it takes less than a minute to take it off and replace the guard.

Of course you know what I will do….....I will build a compound miter jig….........just to be a smartie….........(-:

31 deg F here this morning, it will probably get up in the high 40’s this afternoon.

-- Jim, Anchorage Alaska

View jack1's profile


2170 posts in 5490 days

#15 posted 04-16-2011 08:59 PM

Looks good.

-- jack -- ...measure once, curse twice!

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