1) Quantities - 
Single prototypes
to continuous
production runs.
2) Materials -
All metals (except
magnesium),
plastics. We
specialize in
cast aluminum
alloys, brass
alloys, steel, and
steel alloys.
3) CNC Turning
Diameters up to
20", Maximum
length 36",
Tolerances to
+/- .0005"
4) Manual
Turning -
Diameters up to
16", Maximum
length 60",
Tolerances
to+/-.0005"
5) Hard Turning
Diameters up to
7", Maximum
length 36",
Tolerances to
+/-.0002"
6) CNC Milling & Drilling
- Maximum workpiece size 20"x40"x16",
Tolerances to +/- .0005"
7) Manual Milling - Maximum workpiece size
20"x40"x10",
Tolerances to +/- .001" Hole Tolerances to +/- .0005"
8) Welding - Mig, Tig, Arc
9) Assembly - We maintain a dedicated
work area for the assembly
of multiple machined components including insert, sleeve, and bushing
pressing up to 150 tons.
10) Secondary - J-Marcs utilizes only
the highest quality sources for
the supply of secondary operations such as plating, black oxide and
other coatings, broaching, splining, heat treating, and others in
accordance with the requirements of our customers. All secondary
operations suppliers are located in the Greater Chicago area in close
proximity to our manufacturing plant.
