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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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milling 17-4PH stainless
RE. my last post on buying carbide end mills.
THe job I was doing when I killed the two 3/4" x 2.25" LOC carbide ends mills was milling a slot in 17-4PH annealed stainless. About 32 Rockwell C. First end mill was run at S651 F4.67 really badly chipped after first piece. Second one was run at S300 F3.10 I got throught 1/2 a slot when I got a X-axis overload. It had started to pull the part up out of the vise and was cutting in deeper. Finished that part and the last one with a HSS end mill, uncoated, at S212 F1.49 and it worked nicely, but alittle slow. Job is done, but why was I killing end mills? First end mill was run at speed and feed I found for a carbide finish end mill. Second F&S was from a table in an OSG book for carbide roughers. 4" round bar clamped tight as hell in a kurt vise with 3" tall jaws. Remove 333 to reply |
#2
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milling 17-4PH stainless
"Randy" wrote in message ... RE. my last post on buying carbide end mills. THe job I was doing when I killed the two 3/4" x 2.25" LOC carbide ends mills was milling a slot in 17-4PH annealed stainless. About 32 Rockwell C. First end mill was run at S651 F4.67 really badly chipped after first piece. Second one was run at S300 F3.10 I got throught 1/2 a slot when I got a X-axis overload. It had started to pull the part up out of the vise and was cutting in deeper. Finished that part and the last one with a HSS end mill, uncoated, at S212 F1.49 and it worked nicely, but alittle slow. Job is done, but why was I killing end mills? First end mill was run at speed and feed I found for a carbide finish end mill. Second F&S was from a table in an OSG book for carbide roughers. 4" round bar clamped tight as hell in a kurt vise with 3" tall jaws. Remove 333 to reply Your surface speed was way too slow, suggest next time start around 180 sfm and work upwards from there. As a point of refrence, I use to mill that stuff in the annealed condition pretty without coolant much all day long on a bridgeport hand mill at a speed where chips just barely begin to turn a light amber color. Avoid re-cutting of chips like the plague. Other caveat being it will work harden in a heartbeat if you're not paying attention and so if it starts into skreeking at you then PULL OUT FAST |
#3
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milling 17-4PH stainless
"PrecisionmachinisT" wrote in message news:qZqdnVfc04NhicXSnZ2dnUVZ_umdnZ2d@scnresearch. com... "I use to mill that stuff in the annealed condition pretty without coolant pretty much all day long on a bridgeport hand mill at a speed where chips just barely begin to turn a light amber color" To clarify, the above was done using M48 HSS endmills... |
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