Currently we are utilizing indexable carbide inserts for single point turning processes more frequently in our shop. It appears that most of these inserts are available in “Molded†or “Ground†tolerances. Can you tell me the benefits of one over the other? And how will I see the performance advantages from the more expensive “Ground†inserts?
Shop Doc Forum » Cutting Tools
Indexable Carbide Inserts. Single point turning. Benefits of "Molded" vs. Ground
(3 posts) (3 voices)-
Posted 1 year ago #
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Typically the ground insert allows for a more precise index of the insert from edge to edge. If your holder is worn and you have to make excessive offset it is a waste of money using the ground insert. (This would be typical of a knee or long turn operation on a screw machine) If you are on a cnc and keep your holder in good shape, the ground inserts will help you keep your scrap cost down by making minimal or no offset at all.
If you are using the ground insert for cutting edge prep or to help with chip control that can be worth the investment.
From my experience 80% of the time molded inserts work. Now most of my experience comes from the turning side of life in the screw machine world and some fixed head stock cnc.
Ask your tooling distributor what would work best, why am I not using molded inserts and have them bring in the manufacturing rep. If they can’t give a good reason to be using molded inserts then they are just trying to inflate their sales.
Posted 1 year ago # -
Egghead has it right on. Also you may not be able to experience the extra benefit of the ground inserts if your machine has some wear on it and won't cut real accurately anyway.
I have't used non-indexable tools in almost a decade now due to the savings and flexibility of the newer alternatives.
The real glaring difference I've seen is when using indexable milling tools. The ground inserts are the only way to go in this instance in my opinion. The accuracy of the ground ones is almost required to ensure even insert chip load.
Rgds,
JohnPosted 1 year ago #
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