|Forum topic by coloradoclimber||posted 12-27-2009 09:09 PM||16677 views||3 times favorited||43 replies|
12-27-2009 09:09 PM
I bought some fixed blade knife kits from Woodcraft to make for Christmas. The “kit” is really just the blade, I have to add the scales and rivets.
I cut the wood for the scales, sanded the inside, sanded the blade tang, cleaned both the scale and the tang with acetone, mixed some two part epoxy, spread a thin uniform coat, then clamped for 24 hours.
I got the scales thinned to the thickness I wanted and was starting to shape them when the first scale popped off. I checked the other side and sure enough I could see the other scale was coming loose too, a quick poke with a pocket knife under the scale and it popped off too. I checked the others and I could see that at least 3 more were starting to pull loose. I tested them with a pocket knife and they popped off with a little prying. They probably would have held in place for a while but likely would have come off eventually.
So, now what? I’ve already shaped the scales and I would like to use them. I can epoxy them back on but I’m not sure what went wrong the first time. I made 4 knives, the first has wenge scales and those seem to be staying on. Two have cocobolo and 3 of those 4 scales are off. The last was chakte viga, that’s the one that popped both scales off first.
I thought maybe it was the wood, that the epoxy was not sticking to the wood because of some oils or something but when the scales popped off all of the epoxy was attached to the scale and almost none on the tang.
Next I’m thinking maybe it is because of moisture content in the wood. I cut the cocobolo and chakte scales from wax covered turning blocks. The wenge I had laying around the shop for a year or so. I did not let the scales sit very long before gluing them. Maybe a couple days Definitely the cocoblolo and chakte scales seem to have a higher moisture content than the wenge. At least they rasp much cleaner without much tearout. I don’t know if that is a property of the wood or moisture.
I’ve already sent a PM to Mark DeCou, it looks like he’s gone down this path more than once.
So what else should I do? How do you glue on knife scales and any suggestion on whether it could be the wood or moisture?