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--- infra:tools:bridgeport [2021/01/10 14:22] – radex
+++ infra:tools:bridgeport [2021/01/10 14:22] – radex
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 The mill is made almost entirely of cast iron, weighs about 1500kg and provides a 457x305x127mm (X/Y/Z) working area, adjustable along the Z axis within further 365mm by moving the knee. Major cast parts are shared with the Bridgeport Series 1 CNC mill, which is equipped with a much more advanced control, but lacks handwheels for manual operation. Other mills sharing all or most major parts include Bridgeport BOSS, Bridgeport EZ Trak and early Bridgeport Interact models.
-The spindle is driven by a 1.5kW 3-phase induction motor controlled with an INVT GD10-R2G2-4-B 2.2kW VFD and a Reeves-style continuously variable transmission system. Tools use a QuickChange 30 mount, which is a modified DIN 2080/NMTB 30 taper. The milling head/spindle assembly as a whole is a CNC-specific variant of the Bridgeport 2J2 milling head, mounted on a rigid ram, with a permanently coupled ball screw quill in place of the lever-operated classic Bridgeport quill.
+The spindle is driven by a 1.5kW 3-phase induction motor controlled with an INVT GD10-R2G2-4-B 2.2kW VFD and a Reeves-style continuously variable transmission system. Tools use an Erickson QuickChange 30 mount, which is a modified DIN 2080/NMTB 30 taper. The milling head/spindle assembly as a whole is a CNC-specific variant of the Bridgeport 2J2 milling head, mounted on a rigid ram, with a permanently coupled ball screw quill in place of the lever-operated classic Bridgeport quill.
 The X (table), Y (saddle) and Z (quill) axes are driven by SEM MT30H4-44 permanent magnet brushed DC servo motors equipped with built-in tachometers and fitted with coaxial Heidenhain ROD 450B 125line/rev sin/cos encoders. The servos drive 5mm/rev ball screws through toothed belts at a 2:1 reduction ratio. Notably, the X and Z ball screws are stationary and the nut, integrated with a belt pulley, is being rotated around them. Additionally, the Z ball screw is a part of the quill, with the spindle encased within it.