Machine shops require huge quantity of consumables to make product.
High speed steel to make tool bits or tungsten carbide premade bits. Those are consumed as resharpened or chipped in use. Cutting oils and kerosene for lubricating parts as these are cut and generating heat. Sand paper in strips or sheets from 80 grit to 5000 grit to polish parts for fit gets used up fast. Sandpapers think three to six feet of strips for barrel polishing. Valve grinding compound in 40 to 600 for final fitting two parts that must have below .003 tolerances like gas valves. Drill bits (especially certain preferred sizes) last from a month to a year with periodic resharpening. Same goes for reamers to be sure a hole is true to the specified diameter.
Barrel reamers (cutters or buttons) are made by few specialized shops (Pacific Tool & Gauge is one) as are the specific reamers for a chosen caliber. These come in sets of three. One and Two basically open up and establish to chamber shape and size. Number three is the Final and cuts the chamber to SAAMI specs in depth, shoulder, and leed. One and Two would last about six months if you used a drill bit to hog out material. Three or Final has to be precise and would be out of spec if you were trying to cut several chambers a day for a month.
A machine shop needs three phase 240 or 440 watt power at 60 cycles without interruptions. Any loss or power that fluctuates will cause imprecise cuts a trained machinists would need to assess and recut.
Most of all a machine shop needs steel, iron, aluminum, copper, and lead in pure or as alloys in correct ratios. Most salvaged metals can't be trusted to make parts that must endure with out destructive testing first for hardness, ductility, etc, etc.
The Republic is must build a blast furnace to be fed with coke (cooked coal) and some metallurgists that know how to add in alloys like chromium, manganese, boron, and others to make steels for various purposes.
That is why I think the Republic and the KFS have a trade established about New Orleans with beef, ammonium nitrate, leather, motor oil, gear oil, lamp oil, kerosene, diesel, and plastic pellets going to the KFS. The KFS is sending back textiles, machine shop consumables, containers (55 gallon and 30 gallon drums, metal boxes with lids, and assorted tupperware or glass jars with lids), and horses for the Cavalry.
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