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With over 370,000 machines built over the past 70 years and counting, the Bridgeport® Series 1 Standard Knee Mill is the most popular milling, drilling and boring machine available and continues to fulfill the industry’s need for an accurate, reliable, and versatile mill.
Series 1 KneeMill | |
Range | |
Table travel with Power Feed (X-Axis) |
36 in 914 mm |
Table travel without Power Feed (X-Axis) |
31 in 787 mm |
Saddle Travel (Y-Axis) |
12 in 305 mm |
Quill Travel |
5 in 127 mm |
Knee Travel (Z-Axis) |
16 in 406 mm |
Ram Travel |
12 in 305 mm |
Throat Distance (Min.) |
6.75 in 171 mm |
Throat Distance (Max.) |
18.75 in 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 in 9.5 mm |
Manual Drilling Capacity | 2 CI/min |
Boring Range |
6 in 152 mm dia. |
Spindle Diameter |
1.875 in 48 mm |
Quill Diameter |
3.375 in 86 mm |
Speed Range | |
High (Infinitely Variable) | 500-4,200 RPM @ 60 Hz |
Low | 60-500 RPM @ 60 Hz |
Power Quill Feed | 0.0015 in/rev (0.038 mm) |
Manual Adjust | 0.003 in/rev (0.076 mm) |
Manual Adjust | 0.006 in/rev (0.152 mm) |
Worktable | |
Standard |
49 x 9 in 1,245 x 299 mm |
T Slot center distance |
3 @ 2.5 in 64 mm |
T-Slot Size |
0.625 in 16 mm |
Height Above Floor (Max.) |
47.25 in 1,200 mm |
Weight of Workpiece (Max.) |
750 lb 340 kg |
Machine Size | |
Height |
87 in 221 mm |
Weight |
1,930 lbs 875 kg |
Weight (Shipping) |
2,075 lbs 941 kg |
Floor Space |
7 x 10 ft 2133 x 3048 mm |
The Bridgeport Series I Standard Mill is the original milling, drilling and boring machine. The Bridgeport Series I Knee Mill is the most popular mill ever made with over 370,000 machines built over the past 70-plus years.
Standard Features
Innovative airflow cooling design that eliminates the need for external fans to prolong bearing life and prevent expansion from heat build-up.
One-Shot Lubrication System Chrome-Plated Ways and Gibs Color—Machine Tool Gray
Optional Features
2 or 3-Axis Digital Readout
Power Drawbar for R-8 or #30 Quick-Change Spindle Worklight Electrics—NFPA/NEMA-12 Standards, optional NRTL testing
A full range of accessories are available, including optional chrome-plated ways and gibs, to ensure that the machine will last a lifetime.
The Bridgeport Series I Standard Knee Mill is the single most ubiquitous milling, drilling, and boring machine in the world. It can be found in job shops across the globe serving in countless capacities.