I had the need to drill more than 100 1/2" holes in 1/2" steel which resulted in a lot of sharp curly swarf. I have a dozen neodymium coin magnets that I stuck together and placed in a 10" length of 3/4" CPVC pipe that has a PVC end cap glued in. I added a 5/8" dia. x 10" steel barto pull the magnets out of the pipe. Finally, I cut a hole in a cap from my Gillette Edge shaving gel for a tight fit on the CPVC pipe.
To use, I gather up a load of swarf and to dump the load, I pull the bar with magnet stack up past the cap. The cap prevents and swarf from following the magnet any further and it falls into the trash bin.
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