This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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Mr. T (MrT4) said...Valve body is likely way more complex than bulllets , but 5seconds would be long for a bullet ,modern CNC lathe turned .30 bullet is made in cca 7 seconds , Beside speed issues swiss type lathe needs fairly calibrated barstock that is being feed so material alone is way more expensive than the weight of the material used would sugest
Those particular machines performed something like 10 operations, and the cycle time was probably less than 5 seconds. Maybe as little as 1 1/2. It was a long time ago. We had so much equipment I have forgotten the various cycle times. Our plant made about 300,000 tire valves per day with a group of those machines. Making bullets would be much faster. Since the machining stations were linear, they could be made almost any length with any number of operations. Although we had Swiss lathes and old multi-spindle screw machines, the linear machining stations were more cost effective.
Cold forming would be preferable. If the tolerances could not be held tightly enough, cold forming to near net shape could be used prior to final machining. The individual pieces would be held in collets that move from station to station. This is how many of our parts were made.
Even though we used etched wire (for better rubber adhesion), the raw materials were not unusually expensive. Our cost for a completed schrader valve assembly with molded rubber base, spring-loaded valve core and screw-on cap was well under $0.20. Most of the cost was materials. Increasing brass prices is what finally caused that plant to shut down. US OEM's thought we were kidding when we asked for a price increase to cover increased material costs. In the end, Chinese made tire valves were selling for roughly the cost of our raw materials.
Mr. T (MrT4) said:
Valve body is likely way more complex than bulllets , but 5seconds would be long for a bullet ,modern CNC lathe turned .30 bullet is made in cca 7 seconds , Beside speed issues swiss type lathe needs fairly calibrated barstock that is being feed so material alone is way more expensive than the weight of the material used would sugest
Lathes are not the idea. Chop rod to the right weight billet, Press it into the correct shape and then run it between rollers for the final dimensions. The rollers are adjustable so accuracy should be a lot better than conventional bullet dies. Depending on how accurate the press dies are will dictate the finish of the ends, which will be the biggest issue for making projectiles that way.
Modeling ammo for assault rifles and carbines is cool, you could try your hobby and get a job at smith&wesson or Wolf Performance Ammunition. I do modeling too, but only apartment design, and I sometimes have problems with heating as models of different radiators are scarce, and have to make models myself. I take models from www.radiatoroutlet.co.uk/ as their design is modern and practical.