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My video shows an inverted cone (funnel shaped) live center adapter I made for my mini lathe. This allows me to center a rod that doesn't have a hole in the end. I also show a way to convert a live center to an inverted one - but haven't made that yet.
https://youtu.be/SnrKx6RVAxI
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Thanks Guy Marsden! We've added your Inverse Live Center to our Machining category,
as well as to your builder page: Guy Marsden's Homemade Tools. Your receipt:
<div id="blocks"> <div class="block b1 pngfix"> <div class="bimg"> <div> <a href="https://www.homemadetools.net/homemade-inverse-live-center"> <img src="/uploads/254965/homemade-inverse-live-center.jpeg"/> </a> </div> </div> <div class="head pngfix"></div> <div class="left pngfix"></div> <div class="right pngfix"></div> <div class="blockover b1 pngfix"> <div class="title"> <a href="https://www.homemadetools.net/homemade-inverse-live-center">Inverse Live Center</a> <span> by <a href="https://www.homemadetools.net/builder/Guy+Marsden_2">Guy Marsden</a></span> </div> <div class="tags">tags: <a href='https://www.homemadetools.net/tag/centering'>centering</a> </div> </div> </div> </div>
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I always called them "cup centers". When turning commutators on generators and starters they rarely have centers drilled into the armature shafts so I have simple cup centers to replace the live centers. At our older manufacturing plant where I worked many years ago we had quite a few motor/generator welders from WWII that were wonderful welders - 200 to 400 amp P&H and Wilson, which I thought were the superior machines. They were HEAVY when used as portable units.
I still remember turning many armatures with six inches or more commutator diameters, then using a mica undercutting saw (which I still have). Those larger diameter motor/generator armatures had, of course, centers in the shafts. They would have been much too heavy for the cup centers.