Tapping with a Safe - D - Speeder

摘要

Dear Neil, I refer to the article in MEW 291 on "Repairing a "Safe-D-Speeder". Readers may like to know that, in addition to the slow drilling of larger holes, these useful gadgets also work very well for tapping smaller holes, say up to about M6, depending on the material being tapped. They work well as used both in the lathe and the milling machine. I attach a couple of (posed) photos - one showing the 3/8" model set up for tapping a brass bar MS in the lathe and the other showing the 1/2" model set up for tapping a brass flange M6 on the milling machine (note: on the milling machine, I would be using the DRO to obtain the exact PCD hole positions both for the drilling and tapping operations).