Sandvik PrimeTurning

ChipSplitter said:

Is Sandvik's PrimeTurning as good as it's cracked up to be? I have seen videos with it running at .1" DOC and .02 IPR. How does it compare to CNMG 4xxx or WNMG?

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ChipSplitter said:

Is Sandvik's PrimeTurning as good as it's cracked up to be? I have seen videos with it running at .1" DOC and .02 IPR. How does it compare to CNMG 4xxx or WNMG?

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Delw said:

Iv'e been watching these, they would be good for shaft work if they would fit for the journal relief but thats about it, I wouldnt cut away from the chuck for a few reasons.
1 most tool turrets are made to take the force towards the spindle.
2 you have the risk for pulling the part out of the jaws even a tad bit cutting away from the chuck.
no way better than a cnmg or wnmg better meaning stronger.

I been using mainly sandvik for 30+ years in lathes, I always seem to go back to cnmgs and wnmgs for heavy stuff andeven ccmt's

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Mike1974 said:

No comment about prime turning since I don't know it, but have you tried the LNMX inserts and holders for heavy turning? They will move some material!

https://www.mscdirect.com/browse/tn...RVHBNEWDaYquT9SMGKHPbbb-imy-ruxUaAvjJEALw_wcB

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gregormarwick said:

I played with LNMX for a little while, they were great for shifting material, but predicting insert failure was difficult, and losing an edge took out the holder every time before the operator had time to react.

I went back to CNMG.

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Mike1974 said:

I'm surprised to hear that. We used an OD tool and a boring bar with those inserts and we didn't have any problems dialing in the insert changes. We were cutting 4140ph and insert life was pretty much like clockwork.

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ChipSplitter said:

Is Sandvik's PrimeTurning as good as it's cracked up to be? I have seen videos with it running at .1" DOC and .02 IPR. How does it compare to CNMG 4xxx or WNMG?

Click to expand...

Mike1974 said:

I'm surprised to hear that. We used an OD tool and a boring bar with those inserts and we didn't have any problems dialing in the insert changes. We were cutting 4140ph and insert life was pretty much like clockwork.

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gregormarwick said:

CNMG gave me double the DOC at half the feedrate, so cycle times were similar, and it was just way more reliable.

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gregormarwick said:

We were cutting 36CrNiMo4 quenched and tempered which is more or less 4340V. We were running pretty wide open, because the LNMX wouldn't break a chip in that material unless the feedrate was right at the very limit of what the insert could handle, that's why failures were sudden and dramatic. It was a good few years ago, but IIRC we were at 1mm/r which is bordering on high feed turning. CNMG gave me double the DOC at half the feedrate, so cycle times were similar, and it was just way more reliable.

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ChipSplitter said:

What size insert?

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