Back Side Tubing Complete – Again
I finished up the tubing for the back side again. Last time was with fittings, this time with bends. I saved the hardest tube for last!
Here’s looking back when I was using all fittings. The tube I’ll be bending here is the feed tube from the reservoirs to the pumps.
It needs two 90° bends close to the pump that are too close together to make as separate bends, so I made a jig out of a block of pine I had laying around. I cut two 5/8” rabbit cuts on each end, then used a file to round the corners.
The block was not quite thick enough, so I added a stack of index cards to one side and spread them out to match the curve, and then taped them to the block.
This was a practice piece. I need to heat the tube, bend it around the first 90° bend and down over the block to make the second bend all at one time.
Here you can see I have that double bend finished on the right. Now for the second tricky part, getting this 90° bend just the right distance from the other end. I used the pencil lines on the right to line up the right side. Also notice I use the other mandrels in the kit to hold the tubing in place while it cools. This keeps your fingers and thumbs from leaving any marks or indentations in the tubing.
Before I did this tube, I redid the return line tubing going from the flow meter to the reservoirs. It had a very slight slope downwards on the horizontal area before the bend. You could hardly notice it, but I had to redo it. I got a perfect 90° bend this time, and I also made it about 2mm longer on the vertical length. It’s really good now!
Here’s a closer look at the tube I just bent up. It took awhile to get the lengths just right, but I am happy with how it came out