This month our lucky winner of £30 in Chester gift vouchers is Neils Borgen who has a simple solution to cleaning up threaded holes. An article about a simple thread cleaner made me think of an even simpler one. Please take a look at the photo showing some samples. The cleaner is manufactured by screwing a bolt into a threaded piece of rectangular aluminium. A nut is added and tightened to make sure the bolt won't rotate when milled. The aluminium is placed in a vice and the bolt is milled using a vertical mill and a 6mm diameter end mill. More than half of the diameter of the bolt is milled away to obtain an optimal cutting angle on the thread cleaner.
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