Machine shop
Checked Oct 8, 2026
Overton Chicago Gear
Lombard, IL · low volume to production
Certifications · select one to see where it is stated
Where each detail comes from
- Processes · Gear cutting
“Our Klingelnberg hard cut spiral bevel machines typically produce AGMA Q11 sets to 85-inch diameter.”
oc-gear.com/open-gearing-capabilities/ - Processes · Grinding
“OCG uses a combination of profile and threaded wheel grinders”
oc-gear.com/open-gearing-capabilities/ - Processes · 5-axis machining
“OCG has more 5-axis milling machines than any other gear manufacturer in North America.”
oc-gear.com - Processes · CNC milling
“We provide horizontal and vertical gantry milling for any parts that we turn.”
oc-gear.com/contract-machining/ - Processes · CNC turning
“Our manufacturing floor is especially well suited to turn and mill large shafts.”
oc-gear.com/contract-machining/ - Processes · Drilling and tapping
“turning, milling, drilling, 5-axis machining, wire EDM work”
oc-gear.com/contract-machining/ - Processes · EDM
“We offer wire EDM shapes into parts 40-inch square by 24-inch high.”
oc-gear.com/contract-machining/ - Processes · Heat treating
“Precision machining and heat treatment services for non-gearing applications.”
oc-gear.com - Processes · Repair and rebuild
“We rebuild and upgrade gearboxes from any manufacturer.”
oc-gear.com - Processes · Engineering and design
“Engineering expertise to improve or develop more complex gearing.”
oc-gear.com - Certifications · ISO 9001
“Overton Chicago Gear is ISO9001 Registered.”
oc-gear.com - Industries · Oil and gas
“Oil & Gas Fracturing”
oc-gear.com - Industries · Mining
“Mining”
oc-gear.com - Industries · Marine
“Marine”
oc-gear.com - Industries · Energy
“Wind Energy”
oc-gear.com - Industries · Defense
“Defense”
oc-gear.com - Industries · Medical
“Medical”
oc-gear.com - Industries · Rail
“Locomotion”
oc-gear.com - Industries · General industrial
“Metal Processing”
oc-gear.com