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Sliding Miter Saw 5-cut Test

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Blog entry by Rich posted 12-13-2019 11:21 PM 533 reads 0 times favorited 4 comments Add to Favorites Watch

Someone challenged me a while back about my claim of having done a William Ng setup on my sliding miter saw and testing it’s squareness with the 5-cut method. It was suggested that I was BSing because, according to them, you can’t do that on a miter saw.

I’m not sure why that is so hard for someone to understand—it’s a quality saw with an adjustable fence. That means I can do the whole Ng method with feeler gauges and 5-cut to get the adjustment right. I did and it worked great. In fact, the setup I did was at least two years ago, and during that time I’ve swung the saw back and forth between +/- 45º and back to 90º dozens of times, using the built in stops to set the angle. Even the 22.5º stop was right on, as evidenced by the perfect joints on this octagonal tray.

I’ve never had something like a face frame or door frame fail to come together square. I use this saw exclusively for frames—both stick and cope, mitered, and face frames—because the stop system I put on it is so accurate. Obviously, if you don’t get your rails exact on a stick and cope or face frame, it won’t matter how square your saw is—your door or face frame is going to be off. Today, just for fun, I decided to see how it currently fares with the 5-cut test. Here is the result:

So, 0.873 minus 0.865 divided by 4 comes to 0.002 over the length of the board. Since the board was 12”, that means that we have about 0.00016 inches of error per inch. Not bad for a tool that’s often accused of being inaccurate.

Of course it helps to have a good saw. This one is a Makita LS1013F that I bought on Amazon in 2006 for $330. Funny that as I go look up the order I see the saw only has a three-star rating. I’ll give mine a solid five.

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



4 comments so far

View AZWoody's profile

AZWoody

1477 posts in 1831 days


#1 posted 12-14-2019 02:13 AM

Fake news hahaha

View Rich's profile

Rich

5144 posts in 1197 days


#2 posted 12-14-2019 04:20 AM


Fake news hahaha

- AZWoody

Troublemaker… lol

Hey, I managed to get you off of Instagram long enough to give me crap here. I call that a win! Glad to see how well things are going for you with your move. Really awesome new place. I’m happy for you.

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

View AZWoody's profile

AZWoody

1477 posts in 1831 days


#3 posted 12-14-2019 08:22 PM


Fake news hahaha

- AZWoody

Troublemaker… lol

Hey, I managed to get you off of Instagram long enough to give me crap here. I call that a win! Glad to see how well things are going for you with your move. Really awesome new place. I m happy for you.

- Rich

You’re right. I haven’t been here much at all. The move has been keeping me way too busy.
I hope you get a chance to come check it out soon.

View Andybb's profile

Andybb

2376 posts in 1211 days


#4 posted 12-17-2019 08:03 AM

Hmmm…. Anal are you! :-) Never really thought of a MS as a finishing tool that needed that much accuracy. My Bosh has never been aligned since it came out of the box cutting square enough for govt. work 12 years ago when I used a carpenter’s square to check it .


If I’m doing the math right .4655 – .4615 divided by 4 is .001 over a 10” cut just using the fence.

(Just egging Rich on for a response regarding NASA accuracy for woodworking. :-) )

-- Andy - Seattle USA

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