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Wood Sign For Boat Yard

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Project by Talyn posted 1872 days ago 2132 views 0 times favorited 12 comments Add to Favorites Watch

I glued 4 pieces of 2”x 10”x 8’ pressure treated lumber together, designed the boat wheel in Rhino CAD and set the wood up in the CNC to carve and cut out. The Sign is 6 feet x 3 feet. It’s the first Sign I made for a paying customer. I had one problem the next day, the wood started curling up on me; so I screwed 3 boards in the back to stop it from curling anymore. Can anyone tell me why that happened and how to stop it or prevent it from happening the next time?

-- Harry --- Never Give Up, Never Surrender, www.cncdesignwork.com





12 comments so far

View TopamaxSurvivor's profile

TopamaxSurvivor

14620 posts in 2280 days


#1 posted 1872 days ago

Nice programing :-)) Did you pay attention to the growth ring pattern and alternate them? That should help keep it flat. Can’t remeber the proper term for that right now ;-((

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View degoose's profile

degoose

6981 posts in 1959 days


#2 posted 1872 days ago

By carving out the front with the CNC you have changed the dynamics of the surface of the wood .,, ie different to the back thereby allowing the timber to dry out at different rates front to back.. ergo cupping.
as to a solution .. sealing both front and back will equalize moisture retention and evaporation.., ergo less change in surface moisture .. this should help.. also the temperature has an effect on the rate of change.. If the board was laid down on a cold surface it will warp also..timber is a living thing and will change . cleats on the back as you have done will also be of help.
Hope I have Given you something to think about!

-- Drink twice... and don't bother to cut... @ lazylarrywoodworks.com.au For lovers of all things timber...

View stefang's profile

stefang

12605 posts in 1939 days


#3 posted 1872 days ago

Everything Larry said above is correct. Also you should be aware that pressure treated wood is not usually of the same quality as non-treated wood. I have been told that the fastest growing wood is preferred for pressure treating with more growth wood between the rings to facilitate penetration. PT wood purchased here in Norway is normally stored outside to keep it moist, as it shrivels up pretty fast in dry place. We have a lot of rain here. In dryer climates they would probably have to store it indoors to keep it moist.

-- Mike, an American living in Norway.

View jockmike2's profile

jockmike2

10635 posts in 2851 days


#4 posted 1872 days ago

Nice looking sign. The cleats on the back should do the trick.

-- (You just have to please the man in the Mirror) Mike from Michigan -

View Talyn's profile

Talyn

54 posts in 1916 days


#5 posted 1872 days ago

Thanks for the advice. I did alternate the boards, I also let the boards dry out for a month before gluing them together. But every thing Degoose said, I did wrong. I did not seal it after carving & I left the boards laying on a cold table over night. Live and learn! Thanks All!!

-- Harry --- Never Give Up, Never Surrender, www.cncdesignwork.com

View George Barreras's profile

George Barreras

185 posts in 1896 days


#6 posted 1872 days ago

Nice job on the sign. What kind of CNC are you using. I have been contemplating purchasing one to add diversity to my wood working.

-- Nubs,Reserve

View a1Jim's profile

a1Jim

112002 posts in 2181 days


#7 posted 1872 days ago

nice looking sign

-- http://artisticwoodstudio.com Custom furniture

View cajunpen's profile

cajunpen

14365 posts in 2670 days


#8 posted 1872 days ago

Great looking sign. Having a “wanna be” CNC machine (Carvewright) I can appreciate the talent it took to design the carving in your software – Great job! The sign looks really nice – I think that in the future I would refrain from using PT wood for your signs, perhaps Cypress, or Redwood would be better choices for outdoor signs. I don’t know for sure, but I suspect that all of the chemicals used in PT wood would be dangerous when you consider the amount of dust created by carving that much out – also, wonder what the long term effect will be on your CNC machine (from the chemicals). Don’t know for sure – just throwing out some “food for thought”.

-- Bill - "Suit yourself and let the rest be pleased." http://www.cajunpen.com/

View SCOTSMAN's profile

SCOTSMAN

5281 posts in 2190 days


#9 posted 1872 days ago

That’s a sweet looking sign well done it’s really eye catching.regards Alistair

-- excuse my typing as I have a form of parkinsons disease

View Talyn's profile

Talyn

54 posts in 1916 days


#10 posted 1872 days ago

Hi George,

The CNC machine I have, is from a company called K2 CNC. This is a link to the one I have without the vacuum table: http://www.k2cnc.com/shop/proddetail.asp?prod=KG%2D9850%2DR&cat=18

-- Harry --- Never Give Up, Never Surrender, www.cncdesignwork.com

View Grandpaw's profile

Grandpaw

21 posts in 1904 days


#11 posted 1869 days ago

That looks great! Do you plan on staining it? I have the CarveWright myself and I’ve done similar signs – I’d be interested to see how long it took on your machine and what sort of cleanup you had to do. also what kind of wood did ya use?

-rick

-- Carving

View ralbuck's profile

ralbuck

492 posts in 871 days


#12 posted 410 days ago

Great Job.

I try to avoid pressure treated wood if I can.

The pressure treatment actually destroys some of the cell walls in the wood and then it dries very uneven. It causes a lot of warping especially in climates with big swings in the humidity. The warping seems to change as the humidity does also.

It requires more screws than normal wood to hold it where you want it to stay.

To pressure treat the wood they actually boil it in a chamber, then draw a vacuumn as much as possible while still very hot. The next step is to pressurise the vessel with chemicals. After a time period, then the chamber is drained.

This puts the chemicals into the wood. It is an interesting process to see and have explained to you as you see it. I was through 2 treatment plants. One in Fargo, ND and one in central Minnesota, Sauk Center

I had driven local truck for a lumber yard in south eastern ND for a few years. So had some unique experiences.

-- just rjR

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