Expanding ring mandrel
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I wanted to make some rings, but they are quite difficult to hold. Therefore I designed this mandrel to use with drill.
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Model information
- Source
- Printables
- Category
- Mechanical Parts
- License
- Creative Commons — Attribution
I want to make some rings but if they are thin, they are difficult to hold. Moreover if you want to make a nice uniform surface the easiest thing is to mount it on a drill and use files, sandpaper to smoothen the outside. So you insert a M4 nut into this mandrel, then attach it to drill, slip on a ring and by tightening M4x30 bolt this mandrel expands and holds your ring firmly.
You can buy it for 30$ but why to spend this money if you can 3D print it. It works with rings sizes 3 to 24 HK which means 13,2 to 20,2 mm in diameter.
I printed it out of PLA, but PETG or ABS will work as well. TPU might provide even better grip but I have not tested it yet.
Printing:
Material: PLA
Perimeters: 5
Infill: 20% adaptive cubic
Supports: only on ring_mandrel-01 - organic supports everywhere
ring_mandrel-01 must be printed as shown in the picture to prevent snapping of the moving jaws