I just picked up a good running Boss5 Bridgeport CNC and want to convert it over to Mach2 control w/Campbell breakout board and Geckos. I want to keep the original power supply and steppers.
Does anyone know what the Bridgeport Boss5 power supply specs are? I am asking because my biggest concern is over amping the Geckos. Has anyone on here done this type of conversion? Is there a way to limit the amperage of the PS to Geckos to prevent smoking them? My other option is to use the Larken drives, (max 16A) but I hear from a friend that they are a bit noisy compared to Geckos.
The original setup used the secondaries of a 3 phase transformer to make 3 separate power supplies, one for each axis. There is a another single power supply that chops across a saturatable reator for each axis to limit the current.
For your setup you would disregaurd the single supply and reators. Just guessing the separate supplies will be around 100VDC maybe higher. I used the original drives in my setup.
A word of advise the original steppers do not like microstepping. If your ideal is to get better positioning accuracy than the stock 0.001 for the Series I, or 0.0005 for the Series II you may want to consider DC servos with encoders.
The only think I changed was the computer. The K8 plug into XDI board accepts quadrature drive signals. I originally used MaxNC software but have switched to Mach 2.
I use the MaxNC CL option on Mach 2 to get the quadrature signals.
I may pick your brain a bit as time goes on. I just got it last Friday and haven't even powered it up in my shop yet (just finished huge carbon fiber parts order last night at midnight)...Now I can play a bit with the BP.
FYI. The Bridgeport drives have 10 amp fuses for the DC side of the stepper drives. Fuses 12,13, and 14. The current is limited to 8.0 to 8.2 amps by the ACC card using those saturable core reactors. Interesting is that the 8.0 amps has the DC volts down to about 9.5VDC when the motors are stationary. When they are running at max, the current drops to just above 2 amps (unless the motors are tired and weak) and the voltage comes up to about 60 VDC.
The XDI board interfacrs to the UFP board in the control panel and puts out the axis drive pulses through the SMD boards. These signals are isolated by opto couplers on the XDI (ZDI on the BOSS 6).
The BOSS 6 did step in .0005 inches and was available as a series 1 and 2 machine.