Turning with Round Inserts
So, who has used one? Seems to me that if the insert and tool holder can
take the cutting force it should be able to give a pretty good finish even with a pretty aggressive feed. |
Turning with Round Inserts
On Wed, 7 Feb 2018 10:13:10 -0700, Bob La Londe
wrote: So, who has used one? Seems to me that if the insert and tool holder can take the cutting force it should be able to give a pretty good finish even with a pretty aggressive feed. It does. You just need a pretty solid setup so the tool doesn't skate. It applies a lot of pressure to the workpiece. I had a few samples I got from Valenite, I think, in micrograin carbide amd with a sharp edge. I could cut mild steel with them on my old SB lathe. But most round inserts aren't so free-cutting. -- Ed Huntress |
Turning with Round Inserts
"Ed Huntress" wrote in message
... On Wed, 7 Feb 2018 10:13:10 -0700, Bob La Londe wrote: So, who has used one? Seems to me that if the insert and tool holder can take the cutting force it should be able to give a pretty good finish even with a pretty aggressive feed. It does. You just need a pretty solid setup so the tool doesn't skate. It applies a lot of pressure to the workpiece. I had a few samples I got from Valenite, I think, in micrograin carbide amd with a sharp edge. I could cut mild steel with them on my old SB lathe. But most round inserts aren't so free-cutting. -- Ed Huntress I ground some half-round HSS bits to cut wire rope grooves in aluminum and stainless pulley sheaves, which I made narrower and larger in diameter than commercial pulleys for fiber rope. They do leave a smooth finish but I had to wiggle them back and forth to reduce the chip width instead of plunging straight in, or they would chatter excessively on my old SB. -jsw |
Turning with Round Inserts
On 07/02/18 18:34, Jim Wilkins wrote:
"Ed Huntress" wrote in message ... On Wed, 7 Feb 2018 10:13:10 -0700, Bob La Londe wrote: So, who has used one? Seems to me that if the insert and tool holder can take the cutting force it should be able to give a pretty good finish even with a pretty aggressive feed. It does. You just need a pretty solid setup so the tool doesn't skate. It applies a lot of pressure to the workpiece. I had a few samples I got from Valenite, I think, in micrograin carbide amd with a sharp edge. I could cut mild steel with them on my old SB lathe. But most round inserts aren't so free-cutting. -- Ed Huntress I ground some half-round HSS bits to cut wire rope grooves in aluminum and stainless pulley sheaves, which I made narrower and larger in diameter than commercial pulleys for fiber rope. They do leave a smooth finish but I had to wiggle them back and forth to reduce the chip width instead of plunging straight in, or they would chatter excessively on my old SB. -jsw While my Harrison M300 will take a fair cut and the largest radius bit I have is 8mm radius these days when I make the likes of bending formers for my rotary draw tube bender I use the rotary table on the BP as it is far easier and less prone to issues. |
Turning with Round Inserts
On Wed, 7 Feb 2018 10:13:10 -0700, Bob La Londe
wrote: So, who has used one? Seems to me that if the insert and tool holder can take the cutting force it should be able to give a pretty good finish even with a pretty aggressive feed. Adding to that, round inserts are usually made either for milling or for rough-turning with rigid machines and a lot of horsepower. But you get a "wiping" effect because of the geometry, and some applications allow them to be used as really aggressive (and very strong) roughers, while producing an adequate finish for many applications at the same time, in a single pass. Watch for chatter. As Jim mentioned, that's a limiting factor. Chip-breaking is another. BTW, for single-pass turning with rigid lathes, wiper inserts are the coolest thing going. Or they were, a few years ago, when I last wrote about them. I watched them at work at Sandvik (in NJ), and they were fantastic. -- Ed Huntress |
Turning with Round Inserts
On Wed, 7 Feb 2018 10:13:10 -0700, Bob La Londe
wrote: So, who has used one? Seems to me that if the insert and tool holder can take the cutting force it should be able to give a pretty good finish even with a pretty aggressive feed. I use them regularly...but primarily for radius cutting. Remember that the actual cutting surface is pretty big..far bigger than .030 unless you are doing a skim cut. They do work pretty well if your machine is capable of supplying the torque to get in and cut. They are VERY good for aluminum where cutting pressures is moot. Just remember to feed only as fast as it doesnt leave a nice grooved surface. Gunner --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
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