These jaws have come about over a period of time, in fact many years, of a method to hold blanks in jaws quickly and securely, in an area I have always felt was sadly lacking.
But then the woody folk are often behid the times, after all it took over 100 years for the wood chuck to come into exsitence circa 1986 in New Zealand
My back ground in design and engineering goes back over 50 years on three contents including a decade of running a engineering workshop for global R&D dept.
So this is for educational purposes and do not suggest you attempt to make or get made. It is simply my efforts to document a problem I found on journey as a wood turner. Ok for some this appear to be a scary situation , but apply design and years of exerience couple with the Hierarchy of Control to the design this is the results.
It used to primarily hold the blank simply, efficiently whilst turning the the primary tenon. It is never used to turn complete the turning, but rather produce the tenons on several blanks in perparation to making many pieces
They are mounted on a SN2 chuck with 130mm bowl jaws with m6 high tensile Allen cap screws, with additional blank gripping m8 8.8 hex bolts. The m8 hex headed bolts actually bite into the bland and take care of irregularities of rough sawn blanks. Rpms are low and slow, as you would appreciate this is not for the novice turner.But et very effective for me over two decades. It can expand out to approx 12" or 30cm effectively although its not often I do so.
But then the woody folk are often behid the times, after all it took over 100 years for the wood chuck to come into exsitence circa 1986 in New Zealand
My back ground in design and engineering goes back over 50 years on three contents including a decade of running a engineering workshop for global R&D dept.
So this is for educational purposes and do not suggest you attempt to make or get made. It is simply my efforts to document a problem I found on journey as a wood turner. Ok for some this appear to be a scary situation , but apply design and years of exerience couple with the Hierarchy of Control to the design this is the results.
It used to primarily hold the blank simply, efficiently whilst turning the the primary tenon. It is never used to turn complete the turning, but rather produce the tenons on several blanks in perparation to making many pieces
They are mounted on a SN2 chuck with 130mm bowl jaws with m6 high tensile Allen cap screws, with additional blank gripping m8 8.8 hex bolts. The m8 hex headed bolts actually bite into the bland and take care of irregularities of rough sawn blanks. Rpms are low and slow, as you would appreciate this is not for the novice turner.But et very effective for me over two decades. It can expand out to approx 12" or 30cm effectively although its not often I do so.
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