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The Bridgeport® Series I Standard Knee Mill is the most popular milling, drilling and boring machine in the market, with over 370,000 machines built over the past 70 years. It continues to fulfill the industry’s need for an accurate, reliable, and versatile mill. It features an innovative airflow cooling design that eliminates the need for external fans to prolong bearing life and prevent expansion from heat build-up. A full range of accessories are available, including optional chrome-plated ways and gibs, to ensure that the machine will last a lifetime. Hardinge® is the only authorized provider of Bridgeport knee mills, parts and service.

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Technical Data
Series 1 KneeMill
Table travel (X-Axis) 36" (914 mm) with Power Feed
Table travel (X-Axis) 31" (787 mm) without Power Feed
Saddle Travel (Y-Axis) 12" (305 mm)
Quill Travel 5" (127 mm)
Knee Travel (Z-Axis) 16" (406 mm)
Ram Travel 12" (305 mm)
Throat Distance (Min.) 6.75" (171 mm)
Throat Distance (Max.) 18.75" (476 mm)
Spindle (2J Head)
Power Rating 30 min. Duty Cycle 3 HP (2.2 kW)
Power Rating Continuous 2 HP (1.5 kW)
Tooling R-8 Collets
Drilling Capacity
Power Quill Feed 3 3/8" (9.5 mm)
Manual Drilling Capacity 2 CI/min
Boring Range 6" dia. (152 mm)
Spindle Diameter 1.875" (48 mm)
Quill Diameter 3.375" (86 mm)
Speed Range
High (Infinitely Variable) 500 – 4,200 RPM @ 60 Hz
Low 60 – 500 RPM @ 60 Hz
Power Quill Feed 0.0015"/rev (0.038 mm)
Manual Adjust 0.003"/rev (0.076 mm)
Manual Adjust 0.006"/rev (0.152 mm)
Standard 49" x 9" (1,245 x 299 mm)
T Slot center distance 3 @ 2.5" (64 mm)
T-Slot Size 0.625" (16 mm)
Height Above Floor (Max.) 47.25" (1,200 mm)
Weight of Workpiece (Max.) 750 lb (340 kg)
Machine Size
Height 87" (2.21 m)
Weight 1,930 lb (875 kg)
Weight (Shipping) 2,075 lb (941 kg)
Floor Space 7' x 10' (2.13 x 3.0mm)
All information is subject to change without notice
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