Involute Gear Cutting on the Shaper final

As this is one of my most popular videos, it would be awesome if you could help me by subscribing, and if you have the option, check out my uploads playlist, theres some pretty cool stuff there if i do say so myself! Here we are building an attachment to cut an involute gear on the douglas metal shaper, using a rack form (20 degree V) straight sided tool from first principles UPDATE: Director's cut with more footage of the actual tool and gear cutting on the shaper here... https://www.youtube.com/watch?v=XNPXZgq7E4c Mal Wilson's entry into Emma's Spareroom Machineshop Toolmaking competition 2017. If anyone would like further details on the measurements of the various components or cutters, please let me know down below!