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Thread: Circular saw crosscut jig? Reply to Thread
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  Topic Review (Newest First)
03-15-2012 06:07 PM
GulfcoastGuy
Quote:
Originally Posted by Noob View Post
I drew this up for you as a concept, but I haven't built it yet so you might have to tweak it a bit. You'll notice one of the parts has a slot in it so that you can adjust it for squareness.
Very nice. Mine looks similar just a little more squared off in places. I'm going to pin the pivot point with a 1/4" oak dowel in hopes of making the adjustment a little easier.

Thanks
GCG
03-15-2012 05:03 PM
Chris Curl
Quote:
Originally Posted by Noob View Post
I drew this up for you as a concept, but I haven't built it yet so you might have to tweak it a bit. You'll notice one of the parts has a slot in it so that you can adjust it for squareness.
nice!
03-15-2012 03:14 PM
Noob I drew this up for you as a concept, but I haven't built it yet so you might have to tweak it a bit. You'll notice one of the parts has a slot in it so that you can adjust it for squareness.
03-15-2012 10:37 AM
GulfcoastGuy
Quote:
Originally Posted by Chris Curl View Post
Honestly, I'm still a little confused about the issue here ... sorry ...

It sounds to me like the main problem is that your square is not exactly square. If it isn't, then maybe a new square is in order. :shrug:
I'd agree except I'm on my second bad one and I'm pretty sure I can get it right. If I want to gamble, the casinos are a short drive to Biloxi.

GCG
03-15-2012 09:47 AM
Chris Curl Honestly, I'm still a little confused about the issue here ... sorry ...

It sounds to me like the main problem is that your square is not exactly square. If it isn't, then maybe a new square is in order. :shrug:
03-15-2012 06:41 AM
GulfcoastGuy
Quote:
Originally Posted by Dodis View Post
From another Gulf Coast Guy,

Sounds to me like you have it figured out already. I made three 8' saw guides from one sheet of masonite and some 1/2' ply, and cut one into 5' and 3' lengths. On the 3' I added the 90 deg cleat under it for your crosscut jig, only I did have the benefit of a 24" drafting triangle to square it up with.

Plus, you have already described the adjustment setup and calibration to a tee. I say just go make some sawdust!

Mike
Thanks for the conformation. I have a couple of issues aroound the house that are puting it on the back burner till into next week but Ive got what I need to run with the idea.

GCG
03-15-2012 06:26 AM
N'awlins77 Hey James, neat idea! (Referring to the video on square cut jig.)Think I'll be making this one myself. I've be been using a piece of aluminum that I salvaged off of an old machine at work, and it has worked great, but with that jig in the video, you don't have to measure for the offset of the saw and plate each time you make a cut. Just mark your ply and line up the jig, clamp it, and make your cut. I'll be making that one very soon! Thanks again.
03-14-2012 10:39 PM
Dodis
Quote:
Originally Posted by GulfcoastGuy View Post
Thanks but that jig I have. What I need is one to make a crosscut at 90 deg. referenced to the straight edge that jig produces, preferably off a single measurement along that edge.

I've seen some on YouTube and elsewhere but they all assume a true 90 off a frameing square or the like. This is used to attach another fence on the underside perpendicular to the cut fence on the top. Once the 90 is established the reference fence is fixed to the jig with screws and glue.

The reference fence is registered to a straight edge of the panel or board and the cut fence sets up the 90 deg. cut.

What I have in mind is one step further. Do the initial setup with the frameing square but just clamp it in place. Drill and insert a dowel at the intersection of the two fences to be used to both anchor the two at that point and to provide a pivot point. Further toward the other end of the reference fence awat from the cut but still under the runner board (didn't know what else to call it) drill a pilot hole to act as a guide for a adjustment screw in the reference fence and a slightly oversized hole in the runner. The runner would be extra wide to have some meat on the side of the cut fence oposite the cut

Calibration:

With the screw holding the jig to the original square from the frameing square, make a cut on a test board. Flip the test board horizontally keeping the reference edge against the reference fence and make a cut on the other side of the test board. Assuming some error in square the length measured at the base of the test board and the top will be different by twice the amount the jig is out of square. Loosen the adjustment screw for a friction contact, move the refernce fence to correct, retighten the screw and repeat the proceedure. When you reach the level of accuracy desired another dowel can be inserted near the screw to lock the jig in place and other screws can be used for reinforcement.

GCG
From another Gulf Coast Guy,

Sounds to me like you have it figured out already. I made three 8' saw guides from one sheet of masonite and some 1/2' ply, and cut one into 5' and 3' lengths. On the 3' I added the 90 deg cleat under it for your crosscut jig, only I did have the benefit of a 24" drafting triangle to square it up with.

Plus, you have already described the adjustment setup and calibration to a tee. I say just go make some sawdust!

Mike
03-13-2012 11:29 PM
bobj3 Do it all with the item below, quick and easy with a small stick clamped to the square that takes of the angle concern..

Amazon.com: Swanson Tool SO107 12-Inch Speed Square: Home Improvement

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03-13-2012 10:19 PM
GulfcoastGuy
Quote:
Originally Posted by DaninVan View Post
I'm guessing you considered a good quality drywall T square?
Wal-Board Calibrated T-Square 54 in. - 1/8 in. WTS-54 (WLB-88-016) | WallTools.com

Obviously you wouldn't be able to make the sawcut without damaging the Tee, but they're sure convenient for the layout part.
Unlike a framing sq. the Tee arm is undermounted making for a really solid contact with the reference edge...not prone to slipping off.
I use mine for plywood layout as well as drywall; no complaint.
Actually they had one at work that I checked with the 3-4-5 rule and it seemed fairly acurate. I've found some scrap MDF I thought I'd thrown out so I'm going to try my idea if for nothing else to see how close I can get. If that bombs I'll probably give the drywall square another look.

GCG
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