Yesterday I did some more work on my Double Spring Pole Lathe. All was going very well, I cut my through tenons, and the mortises, and all joints fitted snugly. Then came the time to mark out the holes for the wedges. My marking was neat and careful, or so I thought. I cut the holes, probably the best wedge holes I’ve cut to date, but then – disaster! I had not allowed for the thickness of the wood at the root of the tenon before marking out the holes. I’d placed the holes inside the joint, instead of outside!
If you examine the photo (top-right) you will see what I mean. The tenon is to be inserted into the upright part of the frame, and then the hole for the wedge should be to the left of that, as shown in the photo (left) of the bottom crossbar cut a few weeks ago.
Anyway, fixing this wasn’t a big problem. I did not need to cut new crossbars from scratch, I simply elongated the wedge holes out to where they needed to be. So yes, there is an empty hole now inside the frame, but it is out of sight, and doesn’t seem to be adversly affecting the frame in any way (right). Obviously, it would have been better to get this right from the start, but as it is it is fine.
Another mistake that was made: notice the wedges, the crossbar on the left is correct, but the crossbar on the right is not. I should have made sure that this bar was flipped over when cutting the holes so that the wedge could be inserted from the right. As it is it is fine, it wasn’t a little fidgety inserting the wedge and I had to use a bar stuck through the hole of the left crossbar so that I could hammer it in, but again the finished result is very strong.
So, be careful with marking out your cuts so that you are cutting where you should be cutting, and be careful to measure and cut from the right side of your wood!