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Forum topic by KendallsWoodworks posted 06-02-2015 06:56 PM 908 views 0 times favorited 10 replies Add to Favorites Watch
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KendallsWoodworks

4 posts in 651 days


06-02-2015 06:56 PM

Help me if I’m wrong here, I did have some brain damage from radiation treatments for cancer and I am certainly not an engineer or mathmatician. It seems to me that if you make cut #1 then put #1 against the fence and make cut #2 then #1 and #2 should now be at 90 degrees, why can’t you make a second cut on side #2 and measure for accuracy? What is the point of the other two cuts? Like I said, I’m not as sharp as I used to be so go easy on me if the reason is so obvious a third grader should understand it. Sometimes I miss what’s right in front of me.

-- Kendall's Woodworks, Lubbock, Texas


10 replies so far

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DKV

3940 posts in 1966 days


#1 posted 06-02-2015 07:00 PM

I haven’t had radiation treatments but you have totally lost me. What the hell are you talking about?

-- This is a Troll Free zone.

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MrUnix

4218 posts in 1661 days


#2 posted 06-02-2015 07:04 PM


It seems to me that if you make cut #1 then put #1 against the fence and make cut #2 then #1 and #2 should now be at 90 degrees…

Not if your fence is out of square… which is the whole point.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

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Earlextech

1159 posts in 2153 days


#3 posted 06-02-2015 07:05 PM

https://www.youtube.com/watch?v=UC_iF5pZxmI

-- Sam Hamory - The project is never finished until its "Finished"!

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hotbyte

841 posts in 2438 days


#4 posted 06-02-2015 07:09 PM

The key is the 5 cut method takes you around the block, so to speak, and comes back to a cutoff piece where the error can be more accurately measured to determine the adjustment needed to align fence square to the plate. If you just do cut 1 and cut 2, then you are measuring an angle and transferring that to the fence and so forth. With 5 cuts, you can measure the error using calibers and more readily transfer that to the fence adjustment needed.

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Ghidrah

667 posts in 684 days


#5 posted 06-02-2015 07:19 PM

William NG has a similar method for squaring crosscut sleds. If cut#1 has just gone through the blade then placed against the fence and cut#2 is made then all you can expect is parallel sides at C#1 and C#2 not 90° Mark each side 1, 2, 3, 4, place side#1 against the fence make a cut. Place side #2 against the fence and make a cut. Now if your fence is square to the blade you will have 90°.

I suggest you Google NG and watch his sled video, you can adapt it to your situation, be aware squaring your fence to the blade is as difficult as squaring the blade to the miter slots.

-- I meant to do that!

View DrDirt's profile

DrDirt

4167 posts in 3204 days


#6 posted 06-02-2015 07:31 PM

Indeed cut 1 and 2 SHOULD be at 90 degrees.

The reason to do the additional cuts, is because every additional cut magnifies any error.

So that rip of #1 (your fifth cut) will have 4X the error.

So if your fence is actually at e.g. 91 degrees….... (face 1-2) #2-#3 will be off 2 degrees #3-#4 will be off 3 degrees
and the rip of cut 1 will indicate 4 degrees out.

Something to keep in mind when you are deciding to adjust if the thickness back to front only differs by say 0.005…. the actual amount off is 0.00125 for each cut, which is plenty close for cutting wood..

-- 'Political correctness is fascism pretending to be manners' ~George Carlin

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skatefriday

380 posts in 945 days


#7 posted 06-02-2015 07:31 PM

The William NG video is really, really good. (Better than the Wood Whisperer’s similar video).

I watched portions of it repeatedly when remaking the fence on my sled just a couple weekends ago.

View KendallsWoodworks's profile

KendallsWoodworks

4 posts in 651 days


#8 posted 06-02-2015 09:46 PM

Thanks DrDirt, that actually makes sense to me

-- Kendall's Woodworks, Lubbock, Texas

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DKV

3940 posts in 1966 days


#9 posted 06-02-2015 09:49 PM

Kendall, I apologize, there is such a thing as the 5 cut method. Now I have to learn it. Stupid me…

-- This is a Troll Free zone.

View jerryminer's profile

jerryminer

528 posts in 904 days


#10 posted 06-02-2015 10:08 PM

why can t you make a second cut on side #2 and measure for accuracy?- KendallsWoodworks

because cut#2 will ALWAYS measure the same front and back. Cut# 5 will show the error.

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