Inner Stress

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Forum topic by Nollie posted 02-20-2011 06:28 PM 997 views 0 times favorited 6 replies Add to Favorites Watch
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146 posts in 2810 days

02-20-2011 06:28 PM

Topic tags/keywords: question mahogany milling

The athor day i had to make a display cabinet for a company. I used African Mahogany for the project. The problem i encountered was when i cut the 50mm (2 inch) thick boards into 50 mm wide strips , these 50 X 50 X 2.1 m pieces pulled into any direction. I had to drive back to the City (2.5 hours there) to buy new lumber at a cost. My profit on the project was lowered substantially.
Before i cut the 50 mm wide pieces i flattened the boards on my jointer and the planed them with my planer. I edged one side to a perfect strait edge. By cutting them on the table saw each and every one pulled into a different direction while cutting – what a disappointment

I have to build two more cabinets for this client now. The problem is that i am worried about the same thing happening again.

Is there a method to determine if the boards have inner stress

I would appreciate some advice on this

-- Leon .

6 replies so far

View Don's profile


517 posts in 3096 days

#1 posted 02-20-2011 08:10 PM

Is the wood plain sawn or quarter sawn? Plain sawn is usually more likely to twist when ripping. If the grain is not very straight it’s also more likely to twist when ripping. If your working with plain sawn or wild grain then you just need ot rip it wide enough to allow it to be joined again after you rip it. You may also want to allow enough to join it a second time after letting it sit for a day.

-- Don - I wood work if I could. Redmond WA.

View Barbara Gill's profile

Barbara Gill

153 posts in 2683 days

#2 posted 02-20-2011 08:40 PM

If the boards are not the same moisture content throughout the whole board, that will happen.

-- Barbara

View Nollie's profile


146 posts in 2810 days

#3 posted 02-21-2011 05:32 AM

It was plain sawn stock. I wanted quarter sawn but they did not have . It was the last few boards available, should have gone to the other supplier. I will go to another supplier this time, or maybe pop in at all three suppliers before i buy.
Thanks Barbara , i think i must take my moisture meter with me this time.
Thanks you all

-- Leon .

View childress's profile


841 posts in 3565 days

#4 posted 02-21-2011 08:17 AM

Out of all the wood I’ve milled, african mahogany has always been the worse for me. Tension wise. I get more tension wood with that stuff than any other… I think it has something to do with the fact that it grows in tropical climates and has interlocking grain. I have never been able to tell what piece has tension and what doesn’t. Hope you find some suitable lumber…

-- Childress Woodworks

View Nollie's profile


146 posts in 2810 days

#5 posted 02-21-2011 06:44 PM

What i have seen is that on the cut pieces you would have areas of about 38mm diameter that is sunken in. Could this be that the lumber was dried to fast and or to much. I read about this on the Woodweb. I also checked the moisture of the cut pieces – less than 4% moisture. That tells me that the lumber was “over dried” On the 25 mm stock i also had the problem but as severe

-- Leon .

View Nomad62's profile


726 posts in 2981 days

#6 posted 02-21-2011 10:16 PM

Correct kiln work is essential on tricky woods; I’ve also read that before. You may try acclimating it to your shop for a couple weeks before you cut it… good luck.

-- Power tools put us ahead of the monkeys

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