Differences

This shows you the differences between two versions of the page.

--- infra:tools:bridgeport [2020/02/12 17:49] – created q3k
+++ infra:tools:bridgeport [2021/01/10 14:22] – radex
@@ Line 5: / Line 5: @@
 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.
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 ====== TODO ======
   - Buy/trade more QC30 tooling
   - Buy a spindle with a through hole for a drawbar or have the original spindle drilled through - note that the CNC spindle is longer than a classic Bridgeport spindle, which won't fit
   - Add a spindle encoder using automatic car transmission Hall effect sensors using [[https://pico-systems.com/bridge_spindle.html|this guide]] as a starting point.
-  - Rebuild or replace the spindle CVT - it's worn out and damaged, makes the whole machine vibrate
-  - Replace the Bosch Z15-1A servo drive with 3 separate Copley Controls 423 drives (already acquired)
-  - Replace/modify the servo drive power section which currently provides 300VAC with a center tap for Bosch Z15-1A. CC 423 requires a single voltage DC supply instead, preferably 140V to match the maximum voltage of SEM MT30H4-44 servos
-  - Replace/supplement the Heidenhain TNC 131 control with Mesa Electronics 7i77/6i25 combo controlled by LinuxCNC. Keeping the TNC 131 as an alternative is prefereable to replacement, as it's still quite convenient for quick one-off jobs.
-  - Repair the oiling system and buy ISO68 way oil
   - Rebuild the coolant system, add mist nozzle
-====== RS232 link ======
+====== RS232 link (legacy Heidehein 131 controller) ======
 TNC 131 requires a standards-compliant RS232 link with hardware flow control (lack of DTR/DSR will prevent any communication), use a good USB-to-serialconverter. Prolific PL2303 has been tested and confirmed to work properly.