In praise of split cotters

[mklotz]

We're all familiar with this type of clamp...

https://www.amazon.com/Adapter-Threa...ords=rod+clamp

for clamping onto cylindrical forms. Effective for light loading but not the best solution to resist twisting torque in more stressful applications.

A much more effective clamp is the "split cotter". This pdf...

https://madmodder.net/index.php?acti....0;attach=7950

shows two styles of cotter clamps. The one labeled "B" is the more effective and the one that most folks envision when they hear the term "split cotter".

Frank Ford, a prolific contributor on this forum, has described the making and use of a split cotter on his personal web page...

HomeShopTech

A good discussion of split cotters and their design is given in pages 92-96 of Lautard's The Machinist's Bedside Reader (that's the first volume of his three volume series).

Aside: All three of the MBR series are worth adding to your shop library. Guy's website is here...

Guy Lautard.Com Machinists Books & Supplies: Lathes, Milling, Drills, Gunsmithing and Clock making

Sadly, all the MBRs are currently out of print, though he promises to bring them back.