Easy Rotary Broach Tool Grinding

Alternate methods of rotary broach tool grinding. Hex and square broach tools can be made using a lathe, mill or bench grinder A rotary broach lets you cut internal (and external) features such as a hex, spline or a square into an existing hole. This is very useful to make custom tools. Rotary Broach build here:    • Detailed Rotary Broach #TMC2020   Built for the TMC2020 competition Plans available here: https://www.etsy.com/au/listing/83195... Note; plans are revised based on my prototype, and are subject to change with improvements. Drop a comment or an email (go to my 'about page' for email address) if you are interested in buying a rotary broach tool or just the tool bits themselves. If I get enough interest, I will make a batch. Follow me on instagram for behind the scenes and other random stuff   / tommygun_machining   Steel used is from Tyne Valley Metals. Check them out for a variety of materials: https://www.ebay.com.au/str/tynevalle...   / tynevalleyenterprises   I plan to do more videos soon where I show where certain steels provide benefit. Stay tuned. Joe Pieczynski's tool grinding video here:    • Can You Grind Tools on a Milling Machine? ...   Eccentric Engineering (Bench grinder sharpening system and more) https://www.eccentricengineering.com.au/ Crag's workshop demonstrated a simpler bench grinder method here:    • Making a rotary broach cutter   MAKE SURE YOU COVER YOUR WAYS BEFORE GRINDING I didn't cover my lathe as well as I should have but I made sure to thoroughly wipe everything afterwards