Post #1502878

Finally completed: 12mm boring bar with 4mm HSS insert and boring bar holder for use in my lathe. I finished the boring bar first, and used it to bring the bore in the holder to dimension (20mm, to fit the ER20 collet chuck shown here). Huge thanks to Stefan Gotteswinter for his generosity in sharing so much skill and knowledge via his incredible Instagram and YouTube channel. I have learned so much from him, and in particular I pulled the boring bar design wholesale from one of his videos and learned to position slitting saws vertically accurately from another. (I still made kind of a hash of the slot, due mostly to the dullness of the saw blade and its tiny gullets getting packed with chips.) Excited to use these to finish off the bore in my shop-made precision level’s housing!