my mechanics insights's video: Knurling from two Sides - The Perfect Knurling

In this video I'm making a big shaft with a knurled section in the middle. This footage is from a failed restoration video recorded in July 2021. I cancelled this restoration of an old and very rusty 25kg dumbell that was sent to me by a subscriber from Germany. I thought I could still share the footage of the making of this shaft, because it was very special to knurl from both sides with an overlap. I've never done or seen this before anywhere. One very critical point for a successful result is definitely the runout. The part has to run 100% true on both knurlings. Therefore the only way to achieve this was to turn the part between centers. As I don't have any lathe dogs in the shop I decided to fix the part with a dead center with a threaded shaft. Like that the part was running true and was also secured. The knurling went very well and was looking really perfect, also the overlap was almost not visible anymore. I hope you like my work and the video. Huge thank you to all of my Patreon supporters and especially to: Adel AlSaffar Alex McGeorge Alfonso Baz Alistair Moor Amar.k Anthony Eufemio Arron Metcalf Arthur Bendurion Brenna Redpath Chris walter David Barker Edward Conway Embiss Haitham Al Zir isaac james lowe Jean Ceppi John Shebanow Joseph Kamps Josh Denny Josh Ledford Josh Wasserman Joshua Bentley Joshua Scher Kar Marsten Kerem Yollu Lambda GPU Workstations LordPi Mellissa Marcus Monte Gibbs Nathaniel Carver NoLoneSurvivor Pat Thrasher Peter Riddett potokslow SophieHDLM Steve Bothe StevenVR Tyler Carruth VaushVidya Vickie Bligh Vince Valenti Will Black Xavier Carbel Yale Baker Yuri Zapuchlak Adam Holtzclaw Alipasha Sadri Andrew Egerton Andrew Phillips Arni Bjorgvinsson bizzaropanda Bonnie Williamson Brian Hoerl Chad Bryant Charles Copenhaver Crystal Cash Damien Fuller-Sutherland Daniel Trejo Daniel Varga Dave Hardware David Ebert David P Hruska David Powell Endless Mike Grant Daniel Haley McFadden Hard_Boiled Jack Curry jake meckley Jason Koi Jeff Smith Jeremy Cole Johan Vergeer Joël Franusic Ken Rosso Kevin Robinson Kurt Gazow L Rlta Liam Rafle Lina Machina Marc Cerisier Marc Staedelin Mary Casella Mellissa McConnell Micheal Bier Michael Lamp Mossy_Forrest Nik Pasacal Schmikal Peter Cyprian Rebecca Miller Regis Vincent Rob Robert Galyen Sarah Langlais Scott Marshall Stefan Kronander Steven Michalcewicz Suiros Svenja Kuckla Thanny Tim Holt Tom Wallace Trevor Kam Tucker Ifft Victoria Emmenegger William My camera: Panasonic HC-VX11 If you have any questions about the process, machines i'm using or other stuff, just ask me in the comments. I read them all and i try to reply as soon as possible. Sorry for my bad english, it's not my language. I try my best to improve my technical english. Subscribe for more of my content. I'm uploading videos about mechanical stuff, as new creations and buildings and also restorations. Thank you for watching :-) „I make a new one“ T-Shirts: https://teespring.com/stores/my-mechanics My Main Channel: https://www.youtube.com/c/mymechanics My Second Channel: https://www.youtube.com/c/mymechanicsinsights My Patreon Page: https://www.patreon.com/mymechanics