Making a Knurling Tool for the Lathe (Narrated) (1080p_50fps_H264-128kbit_AAC)

In this video i&making a knurling tool for the lathe. I needed to make a straight knurling for my „combination lock“ video on my main channel. I did use my friends knurling tool in a previous video, as it&good to have your own I decide to make one. I bought two straight knurling wheels and now I only need to make a holder for them to use it on the lathe. The first thing I did was making a drawing of it with all the measurements and tolerances. Once I knew the dimensions of the finished part I could organize the material. As material I choose a heat treatable steel 36CrNiMo6 (1.6582). The good thing about this steel is you can&overheat it when hardening and ruin the hardening, as I&just going to harden it with a blowtorch that&perfect. The piece was much bigger in the beginning than it actually needed to be, but that&no problem I&just take a few cuts more and make some more chips. I got this part for free from my friend, so I was happy to get started. First, I turn the part to lenght on the lathe (120mm). Next I did mill it to it&dimension 20x25mm, once I had this done I took out the step 5x95mm. Then I milled the slot for the knurling wheel. Once I got that I only needed to make the hole for the pin and cut the thread which will hold the pin. After the machining I did the heat treatment. Heat it up to around 800°C (cherry), hold the temperature for a moment and quench the part in oil. After that I needed to temper it to take a bit of it&hardness and stress away. Because of...