Best Way to Cut a LOT of 8+ ft 45 Degree Miters

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Forum topic by wilschroter posted 07-08-2019 10:59 AM 666 views 0 times favorited 19 replies Add to Favorites Watch
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144 posts in 1324 days

07-08-2019 10:59 AM

I’ve got to make 64 cuts on cedar boards with a 45 degree miter – each board is about 9 feet in length. I’m going to be matching the long ends together so the miters need to be fairly accurate.

I can do this with my track saw, but the setup and restart are fairly tedious. I’ve got a full sized panel saw but I’m not too confident that the work isn’t going to rock a little bit through the push process.

Table saw seems to give me mixed results because of such a long length. I know the track saw is probably the answer but I wanted to ask you all if you’ve found any other trick.

19 replies so far

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14466 posts in 1938 days

#1 posted 07-08-2019 11:38 AM

A miter saw would be the only other option that comes to mind.

-- Kenny, SW VA, Go Hokies!!!

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4794 posts in 2788 days

#2 posted 07-08-2019 11:51 AM

A miter saw or build a jig to use track saw. Building a jig with plywood should be easy and you can incorporate a way to clamp them down.

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2649 posts in 2207 days

#3 posted 07-08-2019 11:54 AM

Wait you’re saying miter but I think you mean bevel. You’re cutting a 45° angle down the 9ft length correct?
In that case a shaper would be best, then router table (with chamfer bit) and tablesaw will be next. You need feather boards setup to hold the work flat and tight to the fence as well as infeed and out feed support.
I assume you’re wrapping columns or beams?

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144 posts in 1324 days

#4 posted 07-08-2019 11:57 AM

GrantA you're right - sorry. Too early, need more caffeine. Yes, bevel cuts 45. I was thinking the miter saw.

I thought about the router table but moving such a large board feels like it would give me ample room for a bit of shake even with a feather board over such a long run – what do you think?

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97 posts in 1420 days

#5 posted 07-08-2019 01:01 PM

Table saw. Infeed and outfeed supports, featherboards fore and aft in both planes (total of four featherboards) sacrificial fence on the rip fence. One setup, cut all the boards, done. Featherboards should be just snug, not so much for kickback, just to guide the work. sacrificial fence allows the piece close to the fence and gives something to clamp the vertical featherboards to.

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John Smith

2501 posts in 962 days

#6 posted 07-08-2019 01:04 PM

I am thinking long side cuts on two sides ?
like to make a flat deck, fence or accent wall?


-- there is no educational alternative to having a front row seat in the School of Hard Knocks. --

View Robert's profile


3781 posts in 2280 days

#7 posted 07-08-2019 01:13 PM

Gang them up, clamp and use your tracksaw?

-- Everything is a prototype thats why its one of a kind!!

View Delete's profile


439 posts in 1171 days

#8 posted 07-08-2019 02:04 PM

I think your track saw, panel saw or table saw are your best options. All would work, but the table saw would be quicker than the track saw and more precise than the panel saw. You want consistent accuracy through the full 9’ length, finishing it with a well supported lite pass on your jointer would give you that, the bevel will be as accurate as you set your fence.

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#9 posted 07-08-2019 02:29 PM

+1 for GrantA

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13428 posts in 3179 days

#10 posted 07-08-2019 03:31 PM

It’s a rip cut so tablesaw, alternately a handheld router.

-- Rick M,

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5921 posts in 4043 days

#11 posted 07-08-2019 03:32 PM

No matter what you use to cut the bevels, a jig is essential to getting uniform cuts. Support both ends of the board. When I cut a long bevel, I use a board clamped to the fence that presses down on the board to be cut. That will insure the board won’t rise during cutting. The board must remain perfectly flat to the table. If you are wrapping a post, I would cut the bevel slightly more than 45°, by around a degree. This is if the corners don’t match, the gap will be on the inside where it can’t be seen. Of course you will have to add a corner block to keep the corner square.

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2233 posts in 705 days

#12 posted 07-08-2019 04:20 PM

Cedar for exterior? What grade? For fencing? I’ve stopped trying to be too accurate when doing anything with cedar fencing as it looks completely different a year later.

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354 posts in 759 days

#13 posted 07-08-2019 07:08 PM

Shaper with a outboard fence and a feeder would be fastest. Second choice would be the table saw

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144 posts in 1324 days

#14 posted 07-08-2019 07:30 PM

What’s the best shaper you could use? Any recommendations?

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354 posts in 759 days

#15 posted 07-08-2019 08:36 PM

What s the best shaper you could use? Any recommendations?

- wilschroter

In general, or in this application?

Generally 5.5-10hp, 1.25” spindle, and 1000lbs on the low end.

Lots of people start out with the little delta hd or powermatic 26/27. Bigger is better in shapers.

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