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View Full Version : Q: Best way to cut small oring groove? Deviant 06-23-2005, 10:00 AM What is best way to cut a 1mm o-ring groove to a .75mm depth on a mini lathe. I'm considering using a small drill bit. Is there a better way to do this? The machining adventure continues. = ) mxtras 06-23-2005, 12:31 PM OD or face? What's the material? Scott psychomill 06-23-2005, 12:43 PM I'm considering using a small drill bit. HUH???? anoel 06-23-2005, 12:50 PM HUH???? Exactly... Grinding an appropriate form tool is the correct way to do it... Ken_Shea 06-23-2005, 01:12 PM Grind the desired width into a cutter, I have found that it does not have to be round just grind the end square and chamfer the outside. Here is a picture of one ground for a inside. It is looking down from the top, of course a relief has to be ground on the underside. mxtras 06-23-2005, 02:04 PM Ken - Based on the uniformity of the burn marks, that tool looks EDM'd to me....you cheater! :p Deviant - I have frequently used a part off tool for OD grooves since it eliminates a lot of grinding. Face grooving tools for small diameters require either a lot of attention or a very frail cutting edge. Let us know if you need some pointers. :cheers: Scott Deviant 06-23-2005, 02:05 PM It's on the outside of the of the piston... I was considering using a broken drill bit, ground flat. Similar to how people use them to make a boring bar. I was just going to make a 1/4" clamping fixture to hold the bit in my tool post. Grinding a 1/4" tool bit down to less than 1mm is going to be interesting... Maybe I'm over thinking it. Ken_Shea 06-23-2005, 02:24 PM Based on the uniformity of the burn marks, that tool looks EDM'd to me....you cheater! No EDM here, just a cheap grinder and about 20 minutes :D mxtras 06-23-2005, 02:38 PM .....ground by hand - what-everrr (in my best SoCal female voice). It's your story - tell it how you want. (J/K!!!) :D - I am in a goofy mood - painkillers are a guud thing! Good work, Ken. Your patience is obvious. Looks really good. Scott |