Posted: 8/10/2012 10:51:26 AM EDT
| What is MIM? Ive read it with regards to sig 1911's which I am looking at.??? |
| Metal injection molding. Parts are typically injection modeled to an oversize dimension and then machined or fitted to specifications. Most here will tell you how terrible they are but there is alot of he said she said and my buddies gun blew up because of MIM parts on the internet. When done by a quality manufacturer it produces parts that are more than up the standard for high quality firearms. |
MIM...no matter how you cut it, it's still stronger than plastic. 
I don't mind it myself... I really don't think it's all that different than what automakers are doing with engine components like, camshaft lobes, connecting rods,etc...Powdered metal formed in a mold under intense pressure, than machined to spec. |
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Metal injection molding. Parts are typically injection modeled to an oversize dimension and then machined or fitted to specifications. Most here will tell you how terrible they are but there is alot of he said she said and my buddies gun blew up because of MIM parts on the internet. When done by a quality manufacturer it produces parts that are more than up the standard for high quality firearms. I think your estimates are a bit off |
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Parts are typically injection modeled to an oversize dimension and then machined or fitted to specifications.
No, the mold is injected with metal paste and a binder for handling, then fired (sintered) to drive away the binder and leave a nearly net wize part that rquires little machining. When done correctly it makes parts that cannot be made any other way, when not done correctly it makes parts that can have internal voids and be significantly weaker than a forged or cut from solid stick part. It is much faster than lost wax casting since you do not have to make a mold for the way (alsdo often injected) and then assmble a casting tree and coat with ceramic slurry and harden the slurry. The wax is then melted out and liquid metal forced into the mold created. Break away the hardened slurry and close to net parts from cast metal emerge. It is very common in jewelry making, and Ruger has been making guns this way for years. |
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Are all the sigs made with MIM, or just certain models? I assume just the frame is made like this?? MIM is mostly smaller internal parts. Frames are not MIM. Investment cast or forged. Almost any 1911 under a grand is going to have some MIM in it. How much varies from one manufacturer to the next. Colt probably uses the least amount. Properly done MIM is fine. If it bugs you the parts can be swapped out. For a fee of course. |