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Forum topic by richardchaos posted 09-17-2017 10:32 PM 744 views 0 times favorited 28 replies Add to Favorites Watch
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richardchaos

556 posts in 216 days


09-17-2017 10:32 PM

I have some 1×6-8 pine boards that are badly CUPPED. I have a great planner and have tried to machine the cup out to no evail.

My 8 pound water head forgot that the feed rollers are going to force these boards FLAT while machining them then but when they are free the cup will still be there.

I have racked my brain about HOW to machine a CUP out of a board.

What I cant get around is that ANY planner is going to do the same thing…

I guess one could make a complicated ROUTER sled of sorts and router the cup out, but there has to be another way?

ANY SUGGESTIONS

-- “In a time of universal deceit, telling the truth is a revolutionary act.” ― George Orwell


28 replies so far

View hotbyte's profile

hotbyte

989 posts in 2812 days


#1 posted 09-17-2017 10:55 PM

Use a jointer…either hand or powered

View TheFridge's profile

TheFridge

8302 posts in 1323 days


#2 posted 09-17-2017 10:56 PM


Use a jointer…

- hotbyte

Ditto. Or joint one side with a hand plane and send it through.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View AlaskaGuy's profile

AlaskaGuy

3652 posts in 2146 days


#3 posted 09-17-2017 11:06 PM

I still think richardchaos is our old buddy “Ranting Rich” plying his trade.

-- Alaskan's for Global warming!

View papadan's profile

papadan

3584 posts in 3205 days


#4 posted 09-17-2017 11:08 PM

1 X 6 pine, cut it up for kindling and buy some decent wood to build something. By the time you get it flat there wont be anything left.

View JackDuren's profile

JackDuren

331 posts in 796 days


#5 posted 09-17-2017 11:10 PM

Plenty of ways to flatten a cupped board with a planer. Look it up on google…

View StumpyNubs's profile

StumpyNubs

7478 posts in 2637 days


#6 posted 09-17-2017 11:12 PM

“Use a jointer (as if you have one)”... “Get different wood” and “Google it”... Classics. :D

If you don’t have a jointer, you could place a strip of wood beneath the cup to support it. Use double-sided tape, or hot-melt glue to secure it.

Of course, if you have a jack plane that’s sharp, it’s not all that difficult to take most of the crown out with some passes at an angle across the face of the board (from side to side, not end to end.) Once you get it mostly flat-ish on one face, run it through the planer with that face down. Then flip.

-- Subscribe to "Stumpy Nubs Woodworking Journal"- One of the crafts' most unique publications: http://www.stumpynubs.com/

View TheFridge's profile

TheFridge

8302 posts in 1323 days


#7 posted 09-17-2017 11:14 PM



I still think richardchaos is our old buddy “Ranting Rich” plying his trade.

- AlaskaGuy

I still have garbanzolasvegas as a friend :)

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View AlaskaGuy's profile

AlaskaGuy

3652 posts in 2146 days


#8 posted 09-17-2017 11:26 PM


I still think richardchaos is our old buddy “Ranting Rich” plying his trade.

- AlaskaGuy

I still have garbanzolasvegas as a friend :)

- TheFridge


Just remember some people will judge by who your friends are :)

-- Alaskan's for Global warming!

View richardchaos's profile (online now)

richardchaos

556 posts in 216 days


#9 posted 09-18-2017 12:08 AM

I love Garbanzo as well! GREAT GUY! Just don’t loan him any money

-- “In a time of universal deceit, telling the truth is a revolutionary act.” ― George Orwell

View papadan's profile

papadan

3584 posts in 3205 days


#10 posted 09-18-2017 12:10 AM

I still think richardchaos is our old buddy “Ranting Rich” plying his trade.

- AlaskaGuy

I still have garbanzolasvegas as a friend :)

- TheFridge

Just remember some people will judge by who your friends are :)

- AlaskaGuy


Point just proven!

View bandit571's profile

bandit571

18628 posts in 2520 days


#11 posted 09-18-2017 12:22 AM

DVK? aka 716?

-- A Planer? I'M the planer, this is what I use

View papadan's profile

papadan

3584 posts in 3205 days


#12 posted 09-18-2017 12:55 AM

Bandit, I knew DKV, past tense! If he is still alive, he is in a comma somewhere.

View ArtMann's profile

ArtMann

686 posts in 653 days


#13 posted 09-18-2017 12:55 AM

I just used the search function and found a large number of informative posts on “planer sled”. That is what you need to flatten a cupped board if you only have a planer and no jointer. Try it!

View MT_Stringer's profile

MT_Stringer

3115 posts in 3068 days


#14 posted 09-18-2017 01:03 AM

I’ll just throw this out there and then move on.

Use a hot glue gun or regular glue to attache a strip of hard wood to each side of the board so that the edges are flat on the work bench. Do this with the crown up.

Then run the board through the planer until it is flat. Flip it over and run it through until the other side is flat or you get the desired thickness.

Then rip off the extra stuff.

-- Handcrafted by Mike Henderson - Channelview, Texas

View StumpyNubs's profile

StumpyNubs

7478 posts in 2637 days


#15 posted 09-18-2017 04:11 PM

Use a hot glue gun or regular glue to attache a strip of hard wood to each side of the board so that the edges are flat on the work bench. Do this with the crown up.

...

- MT_Stringer

That is an excellent tip!

-- Subscribe to "Stumpy Nubs Woodworking Journal"- One of the crafts' most unique publications: http://www.stumpynubs.com/

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