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16th Oct 2018, 03:20 PM #1Diamond Member
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High cutting speed Seco CCMT09 inserts
There was a few of these Seco inserts going around on eBay recently, 50 inserts for $50 plus postage. Vc (cutting speed) varies from insert brand to insert brand but typically its in the 100 to 200 m/min range for mild steel, but these Seco inserts are getting right up there with a Vc of 460m/min. They work just fine at my usual 100m/min or less.
I'm thinking these inserts are more aimed at the CNC market with very rigid machines and high speed spindles. Any thoughts?
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16th Oct 2018, 04:48 PM #2Philomath in training
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I expect so. I use something similar and was surprised at the speeds they call for.
Michael
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16th Oct 2018, 06:36 PM #3Diamond Member
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The big carbide brands only cater for Industrial users. hobby users and small floppy machines aren't even on their radar. Over the last 3 or so years there has been great increases in the recommended cutting speeds for inserts. When i started 11 years ago rough turning 1045 steel was 150-180M/min, now i have inserts that will rough at 300M/min. That's a pretty good productivity increase.
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16th Oct 2018, 11:25 PM #4Senior Member
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- Apr 2013
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if those inserts are genuine and not just compressed dirt that seems like an amazing price.
Adding to what snapatap said I'd say the carbide brands only really care about the CNC crowd. On a manual machine you are only going to burn through so many inserts and normally are not going to notice much difference between them. I find the limit of what RPM I'll run is normally dependent on how willing I am to dodge the stream of chips flying off the cutting tool and how quick my reflexes are to disengage the power feed.
On a big rigid high HP CNC machine with a full enclosure you could go nuts and if you can bump productivity by running the machine harder. The inserts will still work at the lower feeds and speeds just might not last as long or give the same surface finish.
I have dabbled in ceramic inserts on the lathe for hard turning (turning the hardened layer off hydraulic shafts), they take a little to get your head around as you pretty much want to run as hard and fast as your lathe will go. Looking at the spec sheet for them my lathe would stall well before I could hit the speeds and feeds they recommended.
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