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45 degree / Bevel crosscut sled advice

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Forum topic by athomas5009 posted 06-04-2015 12:49 AM 876 views 0 times favorited 3 replies Add to Favorites Watch
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athomas5009

293 posts in 1083 days


06-04-2015 12:49 AM

Topic tags/keywords: jig question tip

Hi all I’m I’m in the process of building my first 45* / bevel sled for making mitered boxes. I’m pretty much following the video Jay Bates put out. 3/4” birch ply with 1.5” thick fences pretty simple for the most part but my questions come in regards of calibration. In the video he just used a 2’ combo square and called it good enough. Is that all that is really necessary when it comes to this type of crosscut sled? Is there another calibration technique I can use that would ensure a lil more accuracy but not as much work as the 5 cut method? I just fell it would be difficult to get accurate caliper reading using the 5 cut method with this type of sled.

So any advice is appreciated from those with experience building this type of sled.

-- 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.


3 replies so far

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gfadvm

14940 posts in 2156 days


#1 posted 06-04-2015 01:14 AM

I may have just been lucky, but I used a pair of plastic drafting squares from the office supply store to square my fence. Used the technique on the Eagle Lake Woodworking site for building their “Super Sled”.

-- " I'll try to be nicer, if you'll try to be smarter" gfadvm

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hyperfine

2 posts in 1569 days


#2 posted 06-04-2015 06:54 AM

An adaptation of the 5 cut method will work great for your 45 sled. I used this when I made my 45 sled, inspired by William Ng’s video. You just have to draw a picture of a square cut into two triangles, with one triangle flipped to figure out the adaptation. (hint: theoretically you want a square of side length A inches. If you don’t have a square, one point will extend x thousandths past A. So your error is (x/(4A)) thousandths per inch, and you follow the same process for adjustment, etc.) I’ve been meaning to make a write-up and video for it, since it seems like a lot of people have trouble adapting the 5 cut method to 45*. Maybe I’ll write something up this weekend.

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athomas5009

293 posts in 1083 days


#3 posted 06-08-2015 01:01 AM

Well I finished up the sled today. I ended up going with a 24” carpenters square and eyeballing it to the kerf. Which after doing so I felt like I got damn close. I then tested it with the 5 cut method for shits and giggles and found out I got it within .002” over 60” with the square. I tried to be gentle with the calipers so I got the most accurate readings on the pointed corners. Even if my readings weren’t perfect I feel that I prob got it close enough.

-- 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.

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