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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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Newbie question on precision thread
Please pardon me if this is not the correct forum for this message.
I am working on a design that I think is best described as a precision positioning assembly for optics. I contacted a professional gear designer, and I was told by this person that the design would be improved if I used an acme thread for the threaded rod that is in the assembly. My initial design called for a 3/8"-40 thread as this is the finest standard thread size I could find to fit a 3/8" diameter rod. However, looking in Machinery's Handbook, I found that the finest standard acme thread is 1/4-16. I also figure that I would be able to use a 20 pitch with another minor adjustment in the assembly. Is it common practice to have custom threading made for those cases where standard threads do not meet the needs of a project? For my case, I would like to have acme threaded parts where the thread size is 3/8 or 1/2-20, more preferably, 3/8 or 1/2-40. Also, if it is not heard of to have acme threads custom acme threads made in those particular sizes, what about having what Machinery's Handbook calls "unified screw threads" cut to a non-standard size, say 1/2-40 - is this done for cases where standard threads do not meet the needs of a project? Also, does anyone have any recommendations as to where I might get this done (preferably by a professional shop)? Thanks in advance for your response. Best Regards, Matthew |
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