Bridgeport Series 1 MDI Conversion

[Chaz]

In the end I was able to get some Panasonic stock from the supplier of my previous kit used on my other mill.

I will have 2 x 0.75KW and 1 x 1.0KW available. Ill likely install the 1.0KW setup on my other mill (home made machine) and then have the same three for the Bridgeport.

[Chaz]

Managed to get two of these 800 x 600 x 300 enclosures for fairly cheap. Perfect for this (I was thinking to use the original box), but this will work too.

Testing a layout. Any thoughts / concerns with what I am proposing? The VFD will be placed externally.

Thanks

[martyscncgarage]

Looks okay to me Chaz. You've done this before....

[Chaz]

Made progress today, both X and Y motors mounted (not perfect but will do - would prefer to do some steel plates later.

[Chaz]

Making progress, wired up most of the controls, quick test run with some existing / included code. Axis are not calibration yet (distance etc), wanted to check movement. It sounds like the X belt is fouling, will need to sort.

https://youtu.be/oH7v5uF91Gg

https://youtu.be/oH7v5uF91Gg

[cnckeith]

sweet, thanks for posting. k

[Chaz]

Oh, forgot the update this thread

Machine is up and working, got a few things to sort out however its pretty much done.

https://www.youtube.com/watch?v=puJPOph_ME4

[Chaz]

I am looking at spindle options, the current setup seems a bit low powered and I'd like to be able to get faster RPM and ideally rigid tapping etc.

http://gskcnc.com/Support/DA98B_ACDriver.pdf is the driver in question, they do a 2.6KW unit that might suit. Page 25 refers ...

They offer a 'speed control' input of -10 to +10V. Could I use this with Acorn? As far as I am aware, Acorn wants 0-10V, unless it can accept negative and knows this is reverse?

Then, in terms of encoder output from the drive or from the motor, this has typical A, A-, B, B- and Z (or I if you prefer), and Z-. There is no index pulse from what I can tell.

Is it possible to use this with Acorn?

Thanks

[tblough]

Z is the same as index so you should be good there. As for converting 0-10V and direction into +-10V, I haven't tired this but it should work:

SW is your reverse signal. When it is open, the op amp has a gain of 1. When it is closed, the gain is -1. You will need to supply the op amp with at least +-12 volts (+-36 max).

[Chaz]

Z is the same as index so you should be good there. As for converting 0-10V and direction into +-10V, I haven't tired this but it should work:
opamp.gif
SW is your reverse signal. When it is open, the op amp has a gain of 1. When it is closed, the gain is -1. You will need to supply the op amp with at least +-12 volts (+-36 max).

Thanks. Appreciated. Is the switch a manual change (on reverse)?