Sharp pipe thread
I’m using 1/2” black iron pipe in a project. I bought the parts online, and the three dozen 1” nipples I got have razor sharp threads, and the inside edges are also sharp. I’m running lamp wires through them, so this needs to be fixed.
Any idea how to soften them a bit so they don’t slice my fingers or the wire insulation? I’ve been wearing leather gloves while handling them.
On the inside edge I tried a small tapered grindstone drill bit in my press, which is ok but not great. I can hand file the inside, but that would be time consuming.
On the outside I tried a steel wire brush in the drill press, but it was useless. I don’t think filing the threads is an option.
I can’t think of any way to use my bench grinder for this job. I have a dremel; maybe there’s a good bit for this job?
It almost seems they should be tumbled in a slurry of sand and oil. But I can’t think of a way to do that with the available tools.
Any bright ideas?