Eric You can also buy lathe tools ground to 60 degrees for metric and American threads and 55 degrees for Whitworth and BSF. These come in high-speed steel and brazed-on tungsten carbide. Look at the Chronos and Arc Euro Trade catalogues on the web. I am pretty useless at grinidng tools, especailly those with a critical profile. Until you get adept at grinding, i suggest that you buy one of these and try it out. The 'pen-knife' goodie is a thread guage, which enable you to indentify existing threads. Hope that this helps Cheers! Hubert ----- Original Message ----- From: "Eric Walker" <eric@xxxxxxxxxxxxxxxxxxxxxxxxxx> To: <modeleng@xxxxxxxxxxxxx> Sent: Monday, November 26, 2007 8:46 PM Subject: [modeleng] Re: Screwcutting > Thanks for all the sound advice but I'm not very good at sharpening lathe > tools & I know you have to sharpen to the correct profile. Among my tools > is > a tool like a penknife with quite a few blades with different size teeth > are these the profiles for different threads or some other purpose? > > E.W. > MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.