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  #11  
Old 08-10-2017, 10:34 PM
drummerjg drummerjg is offline
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First of all, my sincere thanks for all of the kind words and wishes I have received. You all are a very special group pf people. I am so glad to be a member of this forum.

Now that I am getting back to normal I will post answers, comments, etc to my original question...hopefully tomorrow sometime. Again, my heartfelt thanks to you all.
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  #12  
Old 08-11-2017, 11:06 AM
drummerjg drummerjg is offline
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Quote:
Originally Posted by Gary Campbell View Post
Joe...
First the woodworking part, mostly questions, but I think I might know the answers:

Did you check the moisture content of the wood? Surface? Interior?
How long did it acclimate to the ambient in your shop?
Was it ripped in max 2.5" staves and alternated bark/heart sides?
Was it under pressure when clamped? Did it want to cup?
How long did it sit after gluing for moisture to equalize?

Now the CNC:
Did you surface both sides to equalize?
Any cuts on the back to counteract those on the front?
Are you aware that in most cases screw hold down on the edges will help cause your issue?
Hi Gary, as promised, some answers.....
I did not put a moisture meter on this blank as the wood had been in my shop for over two years, so I "ass"umed it was acclimated and at a good moisture content.

For this project I used 2 6"x15" pieces, so, no, there were not 2.5" or less. I had glued up similar pieces for the accompanying plaque out of oak and all went well.
I have made many door panels where I glued pieces as large a 6" with no issues what so ever.

I did have the blank under clamp pressure, moderate, not gorilla tight. I used small clamps at each joint to prevent the piece from becoming uneven at that joint. It showed no signs of warping/bending while clamped...in fact, when taken out it was down right flat.

I left my blank in the clamps for 24hrs, then removed it and surfaced both sides, taking off 0.05" from each surface. When done it was smooth and flat...nary a gap between it and the spoil board.

I did not pocket out the back side at all. Just skimmed it flat. I never considered doing so since it was going to hang on a wall. What do you recommend for the back pocketing to relive the stress?

Finally, thanks for the image of using screws as a hold down. My issue is the opposite of the one you show. My piece is warping upwards from each end, not down as shown in your picture.

Gary, thanks for the response and help. I appreciate your time and talent!
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Joe Garber
Retired Hobbyist
Stinger 1 SR24
FTC
Laser Pointer
HSD 1.7kw Spindle
Indexing Lathe
WinCNC
Aspire 9
trommlerjg@gmail.com


How to count to 10 in software:
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Last edited by drummerjg; 08-11-2017 at 11:14 AM. Reason: added additional text
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  #13  
Old 08-11-2017, 11:09 AM
drummerjg drummerjg is offline
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Quote:
Originally Posted by rcrawford View Post
When you clamp a piece of wood on the CNC and machine one side, you are also releasing stresses in the wood on that side. It sometimes helps to carve a pocket on the back.
Russell, thank you for the information. The technique of pocketing the back side is a new one to me, and one Gary also mentioned. Can you share how you would approach this? Is it just a very small pocket, say, 0.05" Any help will be greatly appreciated!
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Joe Garber
Retired Hobbyist
Stinger 1 SR24
FTC
Laser Pointer
HSD 1.7kw Spindle
Indexing Lathe
WinCNC
Aspire 9
trommlerjg@gmail.com


How to count to 10 in software:
1,2,3,95,NT,2000,XP,Vista,7,8,10
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  #14  
Old 08-11-2017, 11:12 AM
drummerjg drummerjg is offline
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Quote:
Originally Posted by T.R.MacMunn View Post
Joe , not to get political on this, but I have two cedar signs on my billboard that are not behaving as they should. I've glued up probably 600 vertical grain cedar sign-blanks & NEVER had an issue, so I suspect Trump has cast a spell on Canadian Redcedar..... I can't think of anything else that has changed ......
I don't think its a spell, TR, maybe some residual "heat' from Trump's "fire & fury" directed at N Korea perhaps! Heat does weird things to wood...
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Joe Garber
Retired Hobbyist
Stinger 1 SR24
FTC
Laser Pointer
HSD 1.7kw Spindle
Indexing Lathe
WinCNC
Aspire 9
trommlerjg@gmail.com


How to count to 10 in software:
1,2,3,95,NT,2000,XP,Vista,7,8,10
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