They are old boring and turning tools. Have seen them used many years ago. The holders had the same serations. I think the serations were to keep the tool from moving during the operation.
They are old boring and turning tools. Have seen them used many years ago. The holders had the same serations. I think the serations were to keep the tool from moving during the operation.
I believe you are 100% correct on the serrations were to keep the tool bit from moving in the holder. Back in the days, the tool bit was fixed to the holder and placed on a tool & cutter grinder and ground to a specific geometry and length dimensions for a particular job. This was before the days of having adjustable tooling at the machine as well as insert tooling we have today.
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