Do you have a machine with an R8 spindle? Do you put every tool in an R8 collet or do you use tool holders? Either set screw or collet tool holders. What pluses and minuses lead to your choices?
I have one machine currently in operation with an R8 spindle and I put a tool in a tool holder and put it in the R8 collet. Generally speaking the holding part of the tool holder and the tool are below the spindle (but braced against the spindle nose due to its design). Often I am putting a tool in an ER collet in such a tool holder and then putting the tool holder into the R8 collet. When you think about it there seems to be quite a disconnect there allowing for stacked tolerances to cause issue, but in practice it works ok.
I am gearing up for the new mill that might get here someday, and I plan to do atleast some moderately heavier work with it. My instinct is that a properly fit solid one piece set screw holder would be more rigid than a tool in a collet, but it does have the set screw and most of the tool below the spindle nose.
Just rambling.
I do have a tool grinder so adding a flat to a carbide tool is no big deal.
I have one machine currently in operation with an R8 spindle and I put a tool in a tool holder and put it in the R8 collet. Generally speaking the holding part of the tool holder and the tool are below the spindle (but braced against the spindle nose due to its design). Often I am putting a tool in an ER collet in such a tool holder and then putting the tool holder into the R8 collet. When you think about it there seems to be quite a disconnect there allowing for stacked tolerances to cause issue, but in practice it works ok.
I am gearing up for the new mill that might get here someday, and I plan to do atleast some moderately heavier work with it. My instinct is that a properly fit solid one piece set screw holder would be more rigid than a tool in a collet, but it does have the set screw and most of the tool below the spindle nose.
Just rambling.
I do have a tool grinder so adding a flat to a carbide tool is no big deal.
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