Riser Disaster! Twice!! Help!!!

[Erwincm]

I purchased the blackwood from a reputable source who provides riser wood to the industry. He knows the wood very weel and did not ship it until it had achieved full dryness. In fact, I had to wait almost 2 years from placing the order to get it in hand!

So I think you guys are right on the mark with respect to the inherent structural deficiencies of this design. Agreed that the thermal expansion differences in the materials and 3 separate pieces make this a flawed design. So, I guess I'm back to whether to throw them both in the trash heap or attempt a heroic recovery by using steel pins as described above. I wonder if the steel pins would reinforce the assembly enough to overcome the structural deficiencies. Should I risk it or not?

[fujimo]

if the copper was a no go- and i would be sorry to see it go- but maybe an alternate strip, and then split it down the middle- and put in an i beam  

[Sixby]

Problem with the I beam is that it would eliminate the effect of the copper underlay on the back of the riser.
God bless, Steve

[Erwincm]

For the honeylocust-copper riser, I think I'm going to try pinning it and testing it with excessive amounts of force and repetitions with some kind of test jig. If it fails, in the trash heap it goes. If it passes, perhaps I've discovered a new method for assembling a riser (not likely). As for the blackwood-quilted maple riser, I ordered a large strip of black phenolic today that I will attempt to use as the core of the I-beam. I promise to send pictures of the surgeries and my pass-fail results. Thanks guys!

[Wolftrail]

I commend you on your artistic talent looks very unique turned out great.  

[Erwincm]

Thanks Wolftrail. Can't wait to show you guys the finished how if I can pull it off. I have some unique ideas for the limbs and hardware as well.

[Crooked Stic]

First off the copper and wood are going to expand at different rates and will surely cause trouble down the road. The one with the copper has no same wood running from end to end. Center ibeam a good idea. And moisture too high. NO acetone on your wood.

[tim-flood]

looks to me as you tried to glue endgrain to endgrain, never a strong joint