Boxland: Work Stations and Boxing Tips #8: Cutting the Corner 45 Degree Angles

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Blog entry by Boxguy posted 03-11-2013 04:58 AM 21503 reads 104 times favorited 22 comments Add to Favorites Watch
« Part 7: Process For Setting Depth for Spline Cuts Part 8 of Boxland: Work Stations and Boxing Tips series Part 9: Making an Attached Top Box »

A Quick, Accurate Way To 45 Your Corners

If you build boxes at all, eventually you tire of cranking your blade from 90 degrees to 45 degrees and back…I did. So I built this simple jig, and now I can cut all 8 ends of a box accurately in about 5 minutes, AND STILL LEAVE MY TABLE SAW SET AT 90 DEGREES.

Assumption: I am assuming that you have already laid out the board for your sides and have cut all four sides of your box to length. Short side, long side, short side, long side and have cut a dado slot in these boards that will accept the bottom board of your finished box.

(above) The key to efficiency is this jig. It is designed to hold the box side on a 45 degree angle. It has an adjustable stop running vertically in a track, and a clamp to hold it while you run it across the blade. Used properly, your hands will be well out of the way while this is happening.


(above) To operate the jig, put the bottom dado cut up and clamp the box side in the jig. Feel under the clamped side to see that just a little of the bottom edge of the board extends just beyond the blade-side part of the jig. Now, BRING THE SLIDING STOP DOWN TO CONTACT THE TOP EDGE OF THE CLAMPED SIDE AND LOCK THE STOP. The stop is the white plastic piece with the knob in the sliding track.

Use the clamp lever to be sure the box side is firmly clamped and seated properly in the jig.

Now use the jig to slide the jig and board over the saw blade. KEEP YOUR HANDS WELL INSIDE AND TO THE BACK OF THE JIG. USE THE HANDLE.

(above) Now slide the jig well back on your table saw so the board is well back and out of the way of the blade. To be safe turn off the saw. Release the clamp, spin the side around and put the newly cut edge against the stop.
Then cut the opposite end too.

If you are making a square box leave the stop in place and cut the next two sides. If it is oblong, reset the stop for the next two sides and cut them.

Jig Building Hints:

(above) This shot shows the bottom of the jig. It runs on a single guide. I prefer UHMW (ultra high molecular weight) plastic for runners. These guides don’t swell or shrink and are self lubricating. If you let the guide extend a bit beyond the back of the jig it makes it easy to align the guide with the table saw slot.

(above) This is not a great shot, but you can see the clamping board is supported by an angle cut 2×6.

Additional Suggestions:

While I used a dual clamp modified to hold the clamp in the the jig with one side, and the box side to be cut is clamped on the other side, you could use a simple clamp to hold the box side and screw it securely to fasten it to the jig.

(above) I have found that having the saw-side edge elevated about an inch above the table allows the cut of edges to drop in the center of the blade and the cutoffs are less likely to be thrown by a moving blade. A ZERO CLEARANCE INSERT IS A MUST SO THE SMALL CUT OFFS DON’T GET WEDGED BETWEEN A MOVING BLADE AND THE INSERT.

Recess your clamp so it is even with the angled top of the jig.

Be careful not to let the angled edge of the cut and spun board slip under your stop. If I build another of these, I’ll put a dado and a finger on the stop to prevent the angled side from slipping under the stop.

Design your stop so it stays square to the vertical track.

In practice this jig is quick and easy to use and the build is not really complex. It saves me a ton of time.

-- Big Al in IN

22 comments so far

View CalgaryGeoff's profile


937 posts in 3725 days

#1 posted 03-11-2013 08:06 AM

Wow, that’s quite an impressive invention for 45 deg corners. It looks to be sturdy and well used.

Here’s a picture of the one I use for my 45 deg box corners.

-- If you believe you can or can not do a thing, you are correct.

View Jim Rowe's profile

Jim Rowe

1133 posts in 3555 days

#2 posted 03-11-2013 09:53 AM

Thanks for posting this. I have been trying to figure out how to do something similar to this for a while. Will it accommodate different thicknesses of wood or does the angled bed need adjusting each time to take the wood closer to or further away from the blade?

-- It always looks better when it's finished!

View ernie's profile


25 posts in 3250 days

#3 posted 03-11-2013 09:59 AM

Boxguy and CalgaryGeoff, like each jig. 45 from a 90 blade and a 45 blade.
Any more jig posts out there?
104 days I am a member. New to LJ and NEW to woodworking.
Read LJ one and two times a day every day. Learning something every day.
To all you pros out there, all of you look like pros to me, I am sure there are a few more newbies like me
on here and believe me we learn from each and every one of you.
Thank you, all, even the simplest things.
From my shoes it is a whole new world.

-- Ernie, Etna, WA

View Blackie_'s profile


4883 posts in 3756 days

#4 posted 03-11-2013 01:04 PM

A couple few questions Big Al,

1. Which jig clamp system is that you are using?
2. What is the difference if any dado on the bottom opposed to a .45 mitered bottom?


-- Randy - If I'm not on LJ's then I'm making Saw Dust. Please feel free to visit my store location at

View GrandpaLen's profile


1652 posts in 3515 days

#5 posted 03-11-2013 03:24 PM

Big Al,

”So I built this simple jig…”

Simple…, yes, but with the sophistication of the Projects you build with it.

That Jig has so many additional miter uses, we should have one hanging next to our Crosscut Sleds.

...I need to go shopping for some of that hardware today.

Well done and a big LJs’ “Thank You” for sharing.

Best Regards. – Len.

Work Safely and have Fun.

-- Mother Nature should be proud of what you've done with her tree. - Len ...just north of a stone's throw from the oHIo, river that is, in So. Indiana.

View Boxguy's profile


2901 posts in 3511 days

#6 posted 03-11-2013 04:51 PM

Randy, I think this is an All-In-One clamp, but honestly any of the similar straight edge clamps will do. Remember you need them to fit flush on the jig’s top surface. This brand is a little thinner than most.

I think a 45 bottom is very difficult to do and get a nice fit. With a dado groove bottom it is easy and has a good deal of forgiveness in the fit. I’ll do a tutorial some time on fitting in the bottom. It is not hard if you use the right process. A 45 relies on glue, the dado groove version is mechanical and can float. The only way I have found to get a good fit on the 45 is to run the edge across a router bit to get a crisp 45 on both faces…then everything has to fit up tightly and the fit is tough. With a groove all of that is easy and the solid wood bottoms can float.

-- Big Al in IN

View Blackie_'s profile


4883 posts in 3756 days

#7 posted 03-11-2013 05:16 PM

Ah ok great, thanks for that explanation. I’ve done kitchen cabinet drawers so I’m thinking it’s the same process on these boxes.

Side Note I just got back from local woodcraft and bought the forrest only instead of a grind 2 I bought a grind 1.

-- Randy - If I'm not on LJ's then I'm making Saw Dust. Please feel free to visit my store location at

View Roger's profile


21055 posts in 4047 days

#8 posted 03-12-2013 09:43 PM

No wonder yer the “Box-Guy”. This helps splain it.

-- Roger from KY. Work/Play/Travel Safe. Keep your dust collector fed. [email protected]

View dclark1943's profile


270 posts in 3431 days

#9 posted 03-21-2013 03:13 PM

Hey Box-guy; thanks a bunch for this posting. I am about 4 years into box building, and find something new everyday. I really appreciate your approach to this process, as I have tried just about every approach to this I can think of, and your post turned on a light. I currently have a jessem sliding table on my saw, and use a clamp on the miter attachment to cut the sides, which are held on edge. This works great on narrow sides, but doesn’t work on wider sides. Sooooo looks like I’ll be building me a jig similar to what you have shown here. thanks again for your willingness to share! I have some of my stuff posted on my website:; If you’re interested take a gander at some of my attempts at boxes.
Happy box building.

-- Dave, Kansas City

View HuckD's profile


312 posts in 2957 days

#10 posted 11-27-2013 02:20 PM

Boxguy, thanks for posting this project and thanks for linking to it in your current project. I’ve only been on LJ a few months and had not seen this. I’ll be building one of these. Favorited!

-- Visit my Youtube Channel:

View kevinw's profile


199 posts in 4982 days

#11 posted 11-27-2013 03:57 PM

Any insights on how to get the jig angle exactly 45 degrees? If the slightest bit off it is a problem. I built another jig for this type operation and somehow got it off a bit. Quite frustrating.

-- Kevin, Blue Springs, MO

View Boxguy's profile


2901 posts in 3511 days

#12 posted 11-28-2013 02:25 AM

Kevin, I cut the supporting 2×8 on the miter saw and used half of each cut for the mounts. I think it is important to screw the parts together so you don’t get too much slack in the joints. I also blow off the table saw and the jig each time I use it. A little sawdust on the table or in the miter gauge slot can throw off your cut. It is also important to give the jig a wide base so it will be stable as you cut.

-- Big Al in IN

View lj61673's profile


271 posts in 3642 days

#13 posted 11-28-2013 12:51 PM

Well, that certainly is a complicated solution to a very simple problem.
$29 gets you a Beall or Wixley angle gauge.

Set blade to 90deg.
Put magnetic gauge onto blade and press button to zero out.
Adjust blade until gauge reads 45deg.

Your jig is only as accurate as the person building it.

The angle gauge is perfect every time, is cheaper and doesn’t take any time to build.

Whatever works for you.

View kevinw's profile


199 posts in 4982 days

#14 posted 11-28-2013 06:10 PM

I have a really old saw where the table adjusts rather than the blade for angled cuts. Very clumsy plus I extended the table to cut larger sheet goods so now it is nearly impossible to do angled cuts so something like this would be really helpful.

-- Kevin, Blue Springs, MO

View Maveric777's profile


2694 posts in 4320 days

#15 posted 12-07-2013 01:51 PM

Outstanding and very useful jig you have here Box Guy. Think one of my biggest issues in the shop is a solid dead on 45 for my boxes. May have to try my hands at one of these jewels for my shop… Thanks for sharing you handy work….

-- Dan ~ Texarkana, Tx.

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