World's leading marketplace. Number of bids and bid amounts may be slightly out of date. Bridgeport is a historic brand of milling machine and machining center produced by Bridgeport Machines, Inc. The original corporation was founded in Bridgeport, Connecticut and started selling its machines in It became famous in the following decades for small- and medium-sized vertical milling machines, with an iconic form of quill-equipped multiple-speed vertical milling head with a ram-on-turret mounting over a knee-and-column base.
The American Precision Museum's biography of Rudolph Bannow [1] reports that he conceived the iconic design in as the logical machine on which to mount the milling head already being built by the Bridgeport Pattern and Model Works which he owned with partner Magnus Wahlstrom. The first Bridgeport milling machine serial number 1 is on display at the Museum.
Many other companies have cloned the form. Today the Bridgeport brand still produces this configuration in both manual and computer numeric control CNC versions, although tool-changer-equipped machining centers are now equally prominent members of the product line. All of the heads offer variable speeds, the earlier ones via a step pulley cone pulley and the later ones via either continuously variable transmission CVT systems or variable-speed drive.
Machine tapers for toolholding include Morse tapers on early models and the R8 taper a widely used standard that Bridgeport created on most models. Both Morse and R8 allow for both collets and solid holders; and a drill chuck can be held by either of the latter.
Machine slides are of the dovetail type, and rotary bearings are mostly of the roller and ball types. The 50, mark was passed in the 's and the , mark in the 's. The 's and 's have brought the numbers close to the , mark. Along with the machine serial number each milling head is numbered. They are stamped on the main housing and also on a tag on the upper drive. These numbers are prefixed with the model of the head.
The most common are "M", "J", "2J". The J head is a 1hp V-belt drive head that was the main work horse for many years. This was later changed to a 2hp motor. That's what is odd. I have used the info you listed to date my J heads. Therein lies my concern. Thanks for taking the time to post. The machine in question is a dove-tail ram. Not to be argumentative, but the stated is correct.
That is the puzzling part. When I get a minute, I will take a photo and post it Redcoat said:. Click to expand As I said in my original post, I am new to the forum. Can someone tell me how to post photos. The serial on this mill has me bumfuzzled. I have had several BPs in the past, currently 3 and they all fell into the numbering as posted by the gentleman above.
Thanks to all of you who take the time to help others. Brain Coral Active User Registered. Joined Jul 26, Messages Hello Bill and welcome to the forum I then resize them to small x and then import them into a Photobucket library. Then it's a simple matter of copy and paste. This may seem like a long and drawn out way to do it but actually is very quick once you get on to it. I hope that this helps Hope this helps. Both Morse and R8 allow for both collets and solid holders; and a drill chuck can be held by either of the latter.
Machine slides are of the dovetail type, and rotary bearings are mostly of the roller and ball types. Skip to content. An example of a Bridgeport clone.
The head is mounted on the ram by joints that allow it to swivel in two directions. The ram can slide back and forth on the turret, which can swivel on the column. The table sits on the knee, and it can move horizontally in the X and Y axes. The knee rides up and down the column one form of Z-axis movement , and the head contains a quill in which the spindle can slide up and down another form of Z-axis movement or, when the head is swiveled, an additional axis.
A Bridgeport variant that has been retrofitted with motors and controls to function as a CNC machine.
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