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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
Posted to rec.crafts.metalworking
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Draft Angle
Being a mold maker (small niche market) this may sound funny, but its
something I rarely think about. Most of the stuff I make is rounded and/or organic with a flat plane parting line. Ocassionally I'll make a mold for a mold and the draft angle of the master mold is just exaggerated. The cast mold just falls out of the master mold, cavity details not withstanding. I watched the series The Tool & Die Guy started on YouTube about mold making, but he was mostly working with plastic injection molds with ejector pins. He talked about draft angles of around 1 degree. Usually done in setup rather than with a tapered mill. I just started (in 5 or 6 weeks I'll cut it) a job to make a "blank" master mold for somebody. They plan to use the master to mold their own molds when they use them so they have to come out and go back in pretty easily. Its really just a box. He had not even considered draft angle so I asked him... we agreed that it needed some. Do to usage he asked that I use the least draft angle I thought was practical. The easiest way to do it is to rough it out of a solid piece of stock and finish with a tapered mill. Only one setup then. When I was looking at end mill options from MSC 3 degrees seemed to be the most common tapered end mill. Is 3 degrees common for some particular reason? Not necessarily just mold draft angle, but for any reason. When I print or machine master molds I usually go with 5 degrees. I use the resulting cast molds (usually silicone) with a backer plate and a clamp. |
#2
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Draft Angle
Am Samstag, 16. Mai 2020 18:47:32 UTC+2 schrieb Bob La Londe:
Being a mold maker (small niche market) this may sound funny, but its something I rarely think about. Most of the stuff I make is rounded and/or organic with a flat plane parting line. Ocassionally I'll make a mold for a mold and the draft angle of the master mold is just exaggerated. The cast mold just falls out of the master mold, cavity details not withstanding. I watched the series The Tool & Die Guy started on YouTube about mold making, but he was mostly working with plastic injection molds with ejector pins. He talked about draft angles of around 1 degree. Usually done in setup rather than with a tapered mill. I just started (in 5 or 6 weeks I'll cut it) a job to make a "blank" master mold for somebody. They plan to use the master to mold their own molds when they use them so they have to come out and go back in pretty easily. Its really just a box. He had not even considered draft angle so I asked him... we agreed that it needed some. Do to usage he asked that I use the least draft angle I thought was practical. The easiest way to do it is to rough it out of a solid piece of stock and finish with a tapered mill. Only one setup then. When I was looking at end mill options from MSC 3 degrees seemed to be the most common tapered end mill. Is 3 degrees common for some particular reason? Not necessarily just mold draft angle, but for any reason. When I print or machine master molds I usually go with 5 degrees. I use the resulting cast molds (usually silicone) with a backer plate and a clamp. What material goes into the master mould? I don't know a lot about this myself, but I'd be interested to hear the answers. Chris |
#3
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Draft Angle
On 5/17/2020 4:29 AM, Christopher Tidy wrote:
Am Samstag, 16. Mai 2020 18:47:32 UTC+2 schrieb Bob La Londe: Being a mold maker (small niche market) this may sound funny, but its something I rarely think about. Most of the stuff I make is rounded and/or organic with a flat plane parting line. Ocassionally I'll make a mold for a mold and the draft angle of the master mold is just exaggerated. The cast mold just falls out of the master mold, cavity details not withstanding. I watched the series The Tool & Die Guy started on YouTube about mold making, but he was mostly working with plastic injection molds with ejector pins. He talked about draft angles of around 1 degree. Usually done in setup rather than with a tapered mill. I just started (in 5 or 6 weeks I'll cut it) a job to make a "blank" master mold for somebody. They plan to use the master to mold their own molds when they use them so they have to come out and go back in pretty easily. Its really just a box. He had not even considered draft angle so I asked him... we agreed that it needed some. Do to usage he asked that I use the least draft angle I thought was practical. The easiest way to do it is to rough it out of a solid piece of stock and finish with a tapered mill. Only one setup then. When I was looking at end mill options from MSC 3 degrees seemed to be the most common tapered end mill. Is 3 degrees common for some particular reason? Not necessarily just mold draft angle, but for any reason. When I print or machine master molds I usually go with 5 degrees. I use the resulting cast molds (usually silicone) with a backer plate and a clamp. What material goes into the master mould? I don't know a lot about this myself, but I'd be interested to hear the answers. Chris I do not know what intermediate materials he is using, but based on his final product I'd probably use a medium to high durometer silicone. |
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