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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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Left hand end mill ?
Why and where would you want to use one?
TIA. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com |
#2
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Left hand end mill ?
"Spehro Pefhany" wrote in message ... Why and where would you want to use one? TIA. Best regards, Spehro Pefhany Assuming you're making reference to a left hand spiral, they are made to counter-act the forces where heavy cuts tend to pull the end mill out of a collet. I suppose the concept is that it's better to have your cut shallow out instead of the end mill pull deeper, which simply leads to the end mill pulling out all the faster if you're doing pocket work and cutting to a bottom instead of through the material. The other negative is if you're cutting near the table and it pulls out unnoticed, you damage the mill table. While they aren't routinely found, nor used, they serve a valuable function and are worth having for that special job where you have problems. Years ago, when I was making some master tracer templates for the Boeing 747, I scrapped a large superstructure template when a 1" end mill pulled out in just this way. It happens. Harold |
#3
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Left hand end mill ?
Harold & Susan Vordos wrote:
"Spehro Pefhany" wrote in message ... Why and where would you want to use one? TIA. Best regards, Spehro Pefhany Assuming you're making reference to a left hand spiral, they are made to counter-act the forces where heavy cuts tend to pull the end mill out of a collet. I suppose the concept is that it's better to have your cut shallow out instead of the end mill pull deeper, which simply leads to the end mill pulling out all the faster if you're doing pocket work and cutting to a bottom instead of through the material. The other negative is if you're cutting near the table and it pulls out unnoticed, you damage the mill table. While they aren't routinely found, nor used, they serve a valuable function and are worth having for that special job where you have problems. Years ago, when I was making some master tracer templates for the Boeing 747, I scrapped a large superstructure template when a 1" end mill pulled out in just this way. It happens. Harold Nice to have when milling round stuff (cnc or rotary table) and the only clamping is a center bolt. And no, I don't have any. michael |
#4
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Left hand end mill ?
Nice to have when milling round stuff (cnc or rotary table) and the only
clamping is a center bolt. And no, I don't have any. Why not machine a left-handed clamping bolt ? Ron |
#5
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Left hand end mill ?
"RKurtz" wrote in message ... Nice to have when milling round stuff (cnc or rotary table) and the only clamping is a center bolt. And no, I don't have any. Why not machine a left-handed clamping bolt ? Ron Nothing wrong with that idea aside from the fact that most tool boxes have few, if any, left hand taps. Michael's reply was right on the money. Another option is to use the right hand thread and get down VERY hard with the screw so you overcome the cutting force. That can be risky. Harold |
#6
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Left hand end mill ?
Harold & Susan Vordos wrote:
"RKurtz" wrote in message ... Nice to have when milling round stuff (cnc or rotary table) and the only clamping is a center bolt. And no, I don't have any. Why not machine a left-handed clamping bolt ? Ron Nothing wrong with that idea aside from the fact that most tool boxes have few, if any, left hand taps. Michael's reply was right on the money. Another option is to use the right hand thread and get down VERY hard with the screw so you overcome the cutting force. That can be risky. Harold Yeah, that has worked "both" ways for me. That is why there are words like risky and maybe. And phrases like I think.....and well, I thought...... michael |
#7
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Left hand end mill ?
Nice to have when milling round stuff (cnc or rotary table) and the only
clamping is a center bolt. And no, I don't have any. Why not machine a left-handed clamping bolt ? Ron Nothing wrong with that idea aside from the fact that most tool boxes have few, if any, left hand taps. Michael's reply was right on the money. Another option is to use the right hand thread and get down VERY hard with the screw so you overcome the cutting force. That can be risky. Harold Yeah, that has worked "both" ways for me. That is why there are words like risky and maybe. And phrases like I think.....and well, I thought...... michael Geez, I hate to admit it, but it reminds me of a time when I had to clamp an irregular shaped piece to the milling table. After using all sorts of step blocks and clamping bolts, I asked a co-worker if he thought the setup was rigid enough. His reply? " If YOU think it is. YOU'RE the one standing near it!" LMAO.. live and learn, Ron |
#8
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Left hand end mill ?
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