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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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Lathe RPM
Is there a speed you just routinely find yourself using most of the time?
As I've said many times. I'm not a "real" machinist. I just play one on the Internet, and I get paid for some work in a very narrow specialty. |
#2
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Lathe RPM
Bob La Londe wrote:
Is there a speed you just routinely find yourself using most of the time? 900 RPM on my 15" Sheldon. it will go to 1250 RPM, but that just seems too fast. I normally have an 8" adjustable chuck on it. For larger work, or hard materials, I have to change down to a lower gear. Jon |
#3
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Lathe RPM
On 21/08/17 18:52, Bob La Londe wrote:
Is there a speed you just routinely find yourself using most of the time? As I've said many times. I'm not a "real" machinist. I just play one on the Internet, and I get paid for some work in a very narrow specialty. I normally run at 800 rpm or 1200 rpm on my Harrison M300, it will go to 2500rpm but the fuse for the 3 phase converter doesn't like the start-up surge unless the gearbox oil is already warm. For some tougher materials I machine from time to time such as 310 stainless steel I'll drop down to 260 rpm, 370 rpm or 540 rpm depending on the operation and tool material. |
#4
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Lathe RPM
On Mon, 21 Aug 2017 10:52:57 -0700, "Bob La Londe"
wrote: Is there a speed you just routinely find yourself using most of the time? As I've said many times. I'm not a "real" machinist. I just play one on the Internet, and I get paid for some work in a very narrow specialty. Calculate the cutting speed :-) Turning an item, say a foot in diameter, requires a noticeably different speed than turning a 1/2" shaft :-) -- Cheers, Schweik |
#5
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Lathe RPM
RPM is set for surface speed to cut with. Large diameters have more
surface speed - inches/minute. cutting steel or brass depends on the correct setup. Martin On 8/21/2017 7:25 PM, wrote: On Mon, 21 Aug 2017 10:52:57 -0700, "Bob La Londe" wrote: Is there a speed you just routinely find yourself using most of the time? As I've said many times. I'm not a "real" machinist. I just play one on the Internet, and I get paid for some work in a very narrow specialty. Calculate the cutting speed :-) Turning an item, say a foot in diameter, requires a noticeably different speed than turning a 1/2" shaft :-) -- Cheers, Schweik |
#6
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Lathe RPM
"Bob La Londe" wrote in message
news Is there a speed you just routinely find yourself using most of the time? As I've said many times. I'm not a "real" machinist. I just play one on the Internet, and I get paid for some work in a very narrow specialty. I try for a cutting speed around 80-100 feet per minute, using HSS bits on steel. |
#7
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Lathe RPM
I don't know the speeds I use. I have a 3-phase motor & a VFD for which
I made a controller that has a dial for the FPM and another for the diameter. Dial 'em in & the controller takes it from there. On-the-fly adjustments as needed. |
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