Bridgeport Series I Machine0 pages

Bridgeport Series I
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.
The Bridgeport Knee Mill
The long-term reliability of a Series I mill is the result of its design features, the quality of its components, and the craftsmanship of its
hand-scraped ways and precision ground fits. Every Hardinge-Bridgeport knee mill is built as though we’re going to use it ourselves.
That’s why the resale value of a Bridgeport mill remains consistently high. The “bargain” imitators can’t say that. Our competitive
prices are a result of our higher volume—not from building a cheaper machine. Rigidity starts with the main frame components of a
machine, and for this reason, the strength and damping qualities of gray cast iron was chosen.
Patented 2J Head
The unique and patented air cooling system of the “2J” head ensures that any heat buildup in the spindle bearings, belt or quill area is
kept to an absolute minimum. This is achieved by air being drawn into the belt housing and past the spindle bearings by the rotation
of the drive belt. It is then exhausted out of the head assembly at the top of the casting. Distortion and inaccuracy due to excessive
heat rise is kept to a minimum by maintaining the operating temperature within 20 degrees fahrenheit of ambient temperature. This
also results in increased belt and bearing life, as well as more consistent accuracy. Also, with no external cooling fans, vibration is reduced and the ongoing maintenance or threat of a fan failure is eliminated. Fans also frequently require a step-down transformer if the
machine is wired for power greater than 110 Volts.
Series I One-Shot Lubrication
Adequate lubrication ensures a long accurate life for the machine. It also reduces maintenance and makes the machine more sensitive and easier for the operator to use. A metered, centralized system lubricates all of the ways and screw assemblies of the machine.
Operation of the system by a single lever saves the operator time and makes it easy to always provide the correct amount of oil,
predetermined by a series of metering valves built into the system. Many competitive systems do not meter lubrication, which allows
the oil to flow to the point of least resistance. Thus one sliding member may receive more oil than another, possibly causing excessive
wear to the area that is not getting properly lubricated. An optional Automatic Lubrication System is also available.
Hand-Scraped Ways
All alignment ways and gibs are completely hand scraped to within tenths of a thousandth. This ensures
optimum machine geometry, rigidity and accuracy.
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Bridgeport’s Signature Painting Process
Castings are fully inspected, shot blasted, annealed and oxide coated…totally free from rust and contamination. They are then spray filled, sanded and painted with the first of a two-part polyurethane coating
to seal the castings. Painting before machining builds the depth of gloss, which is required of all Series I
machines. The last process prior to skidding for shipment is to spray a final finish coat of the best polyurethane coating available.
Accessories & Repair Parts
Hardinge & Bridgeport are the only certified sellers of Series I accessories and repair parts. We have thousands of accessories and
repair parts in stock and ready for immediate shipment to support our customers. For more information please contact Hardinge &
Bridgeport by calling 800-843-8801 or visit our knee mill web portal online at www.kneemills.com to order documentation, accessories, repair parts and more!