Hi, Kevin- Some of the ferrite cores can be a bit rough around the edges. When I encounter a batch that exhibits this characteristic, I use a drill-bit to clean up the burr prior to winding. Pick a drill-bit of a size substantially larger than the toroid's inner diameter, and spin its tip back and forth a few times in the toroid's hole. You should fine that the burr comes off easily. I don't usually have trouble with the OD of the toroid, but in that case you could use some fine sand paper.
73, Mychael / AA3WF K2 #1025 > With respect to toroid sharp edges, should one rub some "wet and dry" > abrasive paper around the edges before winding? > Kevin > VK3DAP / ZL2DAP _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
