I have always had a problem with wedge grooves, so I decided to build a machine that would solve this problem. I used two gear motors for construction, one for attaching the chuck to the lathe, the other for the drive. The machine works great, although it still requires a few corrections, but it handles wedge grooves very well Start supporting this channel and you will get these bonuses: https://www.youtube.com/channel/UC1riE7iaU-jPm_UXfQr03sw/join