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    • By tastethecake
      Found this instructional manual on screw machine (think of it as all mechanical CNC machine that takes forever to tool up) setup, and it got me thinking about how much of a lost art running one of these things is. CNC lathes and machines in general are obviously much easier to set up but they still cannot match the potential of a multiple spindle screw machine that can spit out parts like nobody's business (they can come quite close however). 

      Another topic of conversation that fascinates me is the concept of the multiple spindle milling machine, at first glance it seems like an inelegant solution to the problem of increasing mill production, but that's just me. Does anyone have any idea if form tools were ever used to cut the outer profile of parts in one pass on these machines? 

      Perhaps I am looking at this from the wrong way however,  once production becomes so important that you need to improve the output of a screw machine, it might be best to look at other options (die casting, stamping, etc.).

      One last note, I wanted to see what people think of stamping sheet metal gears. Is this just a novelty thing someone does for their CAD portfolio or something actually viable?

      More sources below...
      How many spindles are really necessary?
      Running a multiple spindle machine in a small part run world
    • By Curly_
      This came up in a recent discussion I had with a friend over Discord, concerning a hypothetical near-peer conflict (particularly in an urban environment). My friend is of the belief that in such a conflict there isn't no reason to field any small arms (not just service rifles or light machine guns) in anything larger than something like 5.56 NATO, the rationale being that a.) you can carry more of it compared something like 6.5 Creedmoor or 7.62 NATO, b.) you're mostly going to be using it suppressing the enemy so that you can drop high explosives on their heads, and c.) since most combat takes place under 300 meters the extra range would be unnecessary. Is there any merit to this line of thinking? What cases can be made for using more powerful, longer ranged cartridges in SDMRs and (tripod or vehicle mounted) machine guns?
    • By Wiedzmin
      have question about 12.7x99 AP M2 cartridge  WWII time books gives muzzle velocity for AP M2 - 895 m/s for 45in barrel, modern days firing tables and manuals gives 856 m/s for 45in barrel, which is correct, or both correct but 1st for WWII and 2nd for modern dayes cartridges ?
    • By Sturgeon
      This thread is for suggesting contest subjects for the forum to participate in!
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