This means that positive insert lathe holders require less horsepower and can be used with smaller machines. Tool holders for positive inserts have a 0 degree tilt, because the clearance angle is built into the insert. Turning tool holders for negative inserts have a 5 degree tilt to provide clearance that prevents rubbing on the workpiece. Positive inserts are better for cutting aluminum, other non-ferrous materials, and low carbon steels. Negative inserts are inherently stronger and have more cutting edges compared to positive inserts. Indexable ISO standard turning inserts with no clearance angle are negative inserts, and those with a clearance angle are positive inserts.
Indexable turning tool holders are fitted with ISO standard turning inserts, while grooving and threading tool holders use either Top Notch, laydown triangle, on-edge triangle, or proprietary grooving inserts.ĬNC turning tool holders are designed to hold either negative or positive inserts. Lathe tool holders securely hold carbide inserts for a variety of lathe operations such as turning, boring, facing, grooving, threading, and parting.
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