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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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Nice Piece of CNC Work
Competitive Cyclist Reviews SRAM XX Dome Cassette:
http://www.youtube.com/user/competit...98/ki24L0UHaEE Video says this takes 9 hours to completely machine. That has got to be a real piece of programming and a tricky batch of tooling. Beautiful part though. Dave |
#3
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Nice Piece of CNC Work
On Tue, 25 Oct 2011 20:50:34 -0400, lid wrote:
Competitive Cyclist Reviews SRAM XX Dome Cassette: http://www.youtube.com/user/competit...98/ki24L0UHaEE Video says this takes 9 hours to completely machine. That has got to be a real piece of programming and a tricky batch of tooling. Beautiful part though. Dave Thats hardly a 9 hour part. Unless the guys are doing it with a manual mill. In fact..on any modern machine..Id be surprised if it took 30 minutes at most. Just a 4th axis and a pair of custom vise "jaws" and off you go. Might be better to rough on a lathe, then do the detail work on a mill. Gunner One could not be a successful Leftwinger without realizing that, in contrast to the popular conception supported by newspapers and mothers of Leftwingers, a goodly number of Leftwingers are not only narrow-minded and dull, but also just stupid. Gunner Asch |
#4
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Nice Piece of CNC Work
On 10/26/2011 12:13 AM, Gunner Asch wrote:
On Tue, 25 Oct 2011 20:50:34 -0400, lid wrote: Competitive Cyclist Reviews SRAM XX Dome Cassette: http://www.youtube.com/user/competit...98/ki24L0UHaEE Video says this takes 9 hours to completely machine. That has got to be a real piece of programming and a tricky batch of tooling. Beautiful part though. Dave Thats hardly a 9 hour part. Unless the guys are doing it with a manual mill. In fact..on any modern machine..Id be surprised if it took 30 minutes at most. Just a 4th axis and a pair of custom vise "jaws" and off you go. Might be better to rough on a lathe, then do the detail work on a mill. Gunner I dunno, babe. Did you catch the taper on the teeth? Not just the recurved profile, but the Z axis taper? It looked different facial/distal. And all the undercutting to remove so much of the weight. I seriously doubt that was done by hand... |
#5
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Nice Piece of CNC Work
On Wed, 26 Oct 2011 01:06:48 -0500, Richard
wrote: On 10/26/2011 12:13 AM, Gunner Asch wrote: On Tue, 25 Oct 2011 20:50:34 -0400, lid wrote: Competitive Cyclist Reviews SRAM XX Dome Cassette: http://www.youtube.com/user/competit...98/ki24L0UHaEE Video says this takes 9 hours to completely machine. That has got to be a real piece of programming and a tricky batch of tooling. Beautiful part though. Dave Thats hardly a 9 hour part. Unless the guys are doing it with a manual mill. In fact..on any modern machine..Id be surprised if it took 30 minutes at most. Just a 4th axis and a pair of custom vise "jaws" and off you go. Might be better to rough on a lathe, then do the detail work on a mill. Gunner I dunno, babe. Did you catch the taper on the teeth? Not just the recurved profile, but the Z axis taper? It looked different facial/distal. And all the undercutting to remove so much of the weight. I seriously doubt that was done by hand... How many cutters do you need with that taper ground into them? I have a guy who does form tooling very very nicely. Gunner One could not be a successful Leftwinger without realizing that, in contrast to the popular conception supported by newspapers and mothers of Leftwingers, a goodly number of Leftwingers are not only narrow-minded and dull, but also just stupid. Gunner Asch |
#6
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Nice Piece of CNC Work
On Wed, 26 Oct 2011 01:06:48 -0500, Richard
wrote: On 10/26/2011 12:13 AM, Gunner Asch wrote: Thats hardly a 9 hour part. Unless the guys are doing it with a manual mill. In fact..on any modern machine..Id be surprised if it took 30 minutes at most. Just a 4th axis and a pair of custom vise "jaws" and off you go. Might be better to rough on a lathe, then do the detail work on a mill. Gunner I dunno, babe. Did you catch the taper on the teeth? Not just the recurved profile, but the Z axis taper? It looked different facial/distal. And all the undercutting to remove so much of the weight. I seriously doubt that was done by hand... No way was that done by hand. You'd end up with 90% scrap parts. That's why CNC was invented in the first place: to remove operator error from the machining process. And look at the through hole weight saving material removal between sprockets. They appear to have about a 32nd or a 16th of an inch radius in the corners. This will require an equally small milling tool to produce. With such small tools, feed speeds will be very low to prevent tool breakage. And there are LOTS of them. I can see where they probably roughed it out and bored the center hole on a lathe. Makes sense to true it up with a good facing vs. the bore placement. The vid said it took 9 hours on the mill. This may be what the sales rep told the video guys. He may, or may not, have been completely accurate on the time factor. Cool part though. Dave |
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