Re: Source for brass channel
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Yes, I've experienced a similar issue on an unrelated part. It was a verrrrry long time ago in a college shop class I took related to my ME degree. We were tasked with fabricating a small C clamp from 0.5 inch steel plate among other things. The shop teacher pointed out to us that when we cut the block out of the cold rolled steel plate, we'd be relieving the stress on that side of the material and the C would tend to pull together a bit. IF it was a precision part, we'd have to take it to the mill to true it up (we cut it on a band saw), but for our purposes, it was simply important to drill the hole through the leg AFTER cutting so it would be straight and not affected by the warpage.
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The moral of the story seemed to be there's no way to prevent this problem. Especially when you're working on something as small as a piece of brass bar stock for an HOn3 loco. Bill Lugg
On 10/7/19 3:58 AM, Dale Buxton wrote:
Long ago (about 25 plus years now) I was working on the same type of project, channel iron for a tender frame. I made some very small channels out of brass bar stock. Using first a slotting saw in my lathe and then a milling machine. Along the way, I encountered a problem that I still don't know how to overcome. It has to do with longitudinal stress relief. When Brass bar stock is extruded, it develops (so I am told) an annealing stress along its length. I my case, the bar stock I was working kept warping away from the slotting saw or milling head as I worked down its length. Every time I finished a cut and I went to reposition the stock in the vise to continue the slot. The stock had developed a springy warp in it that curved away from the cut in it. I tried several times to eliminate warping effect but I never figured it out.
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