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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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Duplicate Boring
I want to make a bunch of identical molds, for 3/4" diameter model
airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? -- http://www.wescottdesign.com |
#2
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Duplicate Boring
On Fri, 08 Apr 2011 21:38:25 -0500, the renowned Tim Wescott
wrote: I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? Hobbing? 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 |
#3
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Duplicate Boring
On Fri, 08 Apr 2011 23:08:55 -0400, Spehro Pefhany
wrote: On Fri, 08 Apr 2011 21:38:25 -0500, the renowned Tim Wescott wrote: I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? Hobbing? P.S. Not the gear-making process, this one: http://tinyurl.com/hobbing 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 |
#4
Posted to rec.crafts.metalworking
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Duplicate Boring
On Fri, 08 Apr 2011 23:16:17 -0400, Spehro Pefhany wrote:
On Fri, 08 Apr 2011 23:08:55 -0400, Spehro Pefhany wrote: On Fri, 08 Apr 2011 21:38:25 -0500, the renowned Tim Wescott wrote: I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? Hobbing? P.S. Not the gear-making process, this one: http://tinyurl.com/hobbing Well, the cavity is cylindrically symmetrical, so I'm not sure that "hobbing" is the right term. It's probably been a screw machine operation since 1920, or at least some sort of tracing operation. Sigh -- I'm always behind the curve. -- http://www.wescottdesign.com |
#5
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Duplicate Boring
"Tim Wescott" wrote in message ... On Fri, 08 Apr 2011 23:16:17 -0400, Spehro Pefhany wrote: On Fri, 08 Apr 2011 23:08:55 -0400, Spehro Pefhany wrote: On Fri, 08 Apr 2011 21:38:25 -0500, the renowned Tim Wescott wrote: I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? Hobbing? P.S. Not the gear-making process, this one: http://tinyurl.com/hobbing Well, the cavity is cylindrically symmetrical, so I'm not sure that "hobbing" is the right term. It's probably been a screw machine operation since 1920, or at least some sort of tracing operation. Sigh -- I'm always behind the curve. I must be dull tonight, but I can't visualize what you're doing. Are you talking about some kind of forming in the axis of a spinning tube, or turning the outside diameter to a profile? -- Ed Huntress |
#6
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Duplicate Boring
On Sat, 9 Apr 2011 00:32:29 -0400, "Ed Huntress"
wrote: "Tim Wescott" wrote in message ... On Fri, 08 Apr 2011 23:16:17 -0400, Spehro Pefhany wrote: On Fri, 08 Apr 2011 23:08:55 -0400, Spehro Pefhany wrote: On Fri, 08 Apr 2011 21:38:25 -0500, the renowned Tim Wescott wrote: I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? Hobbing? P.S. Not the gear-making process, this one: http://tinyurl.com/hobbing Well, the cavity is cylindrically symmetrical, so I'm not sure that "hobbing" is the right term. It's probably been a screw machine operation since 1920, or at least some sort of tracing operation. Sigh -- I'm always behind the curve. I must be dull tonight, but I can't visualize what you're doing. Are you talking about some kind of forming in the axis of a spinning tube, or turning the outside diameter to a profile? Like ED, I'm not picturing your cut. That said, form tools up to 3/8 wide are no trouble on a lathe. For example, I cut a V groove in a pulley for a V belt all the time. This assumes your lathe is rigid enough for the cut. Karl |
#7
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Duplicate Boring
On Sat, 09 Apr 2011 00:32:29 -0400, Ed Huntress wrote:
"Tim Wescott" wrote in message ... On Fri, 08 Apr 2011 23:16:17 -0400, Spehro Pefhany wrote: On Fri, 08 Apr 2011 23:08:55 -0400, Spehro Pefhany wrote: On Fri, 08 Apr 2011 21:38:25 -0500, the renowned Tim Wescott wrote: I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? Hobbing? P.S. Not the gear-making process, this one: http://tinyurl.com/hobbing Well, the cavity is cylindrically symmetrical, so I'm not sure that "hobbing" is the right term. It's probably been a screw machine operation since 1920, or at least some sort of tracing operation. Sigh -- I'm always behind the curve. I must be dull tonight, but I can't visualize what you're doing. Are you talking about some kind of forming in the axis of a spinning tube, or turning the outside diameter to a profile? Let me know if you can see this, it should explain: http://www.hippocketaeronautics.com/...rum/index.php? action=dlattach;topic=5869.0;attach=53766;image I'm not so much interested in the flange around the outside as the wheel profile on the inside. Per Pete and Karl I guess I'm looking for a form tool, but one that gets applied in the axial rather than the radial direction. I'm not so interested in cutting the mating flanges -- that's both easy enough and persnickety enough that I should do it by hand. It's getting the tire and hub shapes cut repeatably that interests me. So I guess the real question is: should I be able to do this with a form tool, assuming enough rigidity in my lathe? -- http://www.wescottdesign.com |
#8
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Duplicate Boring
Tim Wescott wrote: I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? -- http://www.wescottdesign.com Are you referring to a lathe "form tool"? If so that's pretty standard stuff. |
#9
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Duplicate Boring
On Apr 8, 10:38*pm, Tim Wescott wrote:
I want to make a bunch of identical molds, for 3/4" diameter model airplane wheels. I'm envisioning a tool that's 3/8" across, that I just sharpen up, grit my teeth, and push into a spinning piece of aluminum to make my desired profile. Is this a sensible thing to consider? *Is there some other way (short of CNC machining) to easily duplicate cavities in the ends of a bunch of aluminum tubes? --http://www.wescottdesign.com A 3/8" wide tool shouldn't be too much for aluminum, if your lathe is solid. I make forming tools to cut round or vee belt grooves in pulleys somewhat narrow and wiggle them in so only the end or one side takes a chip at any instant, reducing the forces and chatter. jsw |
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