Bridgeport Series II Interact 2 Conversion

They are Hendenhain ERO 115 125 D12. I've taken one apart and it has a copper disk with slots in it around the circumference - so I suppose the term Analog Encoder would then be what it is. I'm borrowing a scope from a friend in a week or two and will be able to see the signals at that time. My alternate approach is to try and re-use the existing A-D Board. The Heidenhain manual calls it the Analog Component Board. Encoders and handwheel feed into it, and supposedly digital signals come out. Again the scope will help me determine that.

So given that they are Analog Encoders, I'm now not sure if the resolver boards from Mesa of Pico would work with it. If that's the case then my choices narrow down to:

A. Try to re-use the Analog Component Board like John did with his conversion
B. Replace the Analog Encoders with Digital Encoders

From John's Web page where he documented his build

For the initial setup I just used halrun with a test hal file. This way I could test to see that the motors moved according to the command signal and check the position encoder feedback. This was the first setback in the project as I found that the Heidenhain encoders produced analog sine and cosine 125 cycle/revolution output signals. So to handle the encoder output problem I took the encoder interface board from the old Heidenhain controller and mounted it on the back of the cabinet door close to the PC. The Heidenhain board then outputs 625 A quad B digital cycles per revolution giving a resolution of 2500 counts per revolution. The ball screws have a 5mm pitch and are driven by a 2:1 timing belt reduction from the motors. So 2500 counts of the encoder represents 2.5 mm of motion or .001mm per count.

Jay

KPA wrote:

So given that they are Analog Encoders, I'm now not sure if the resolver boards from Mesa of Pico would work with it.

No, they won't, they are for resolvers, you have encoders.

If that's the case then my choices narrow down to:
A. Try to re-use the Analog Component Board like John did with his conversion
B. Replace the Analog Encoders with Digital Encoders
y

C. Get an interpolation box from eBay (3-channel, or one for each axis)
D. Make an interpolation device out of a microcontroller (such as an Arduino)
E. Square the pulses up with a simple comparator circuit.

E is the easiest, and will also boost the 1V signals to 5V TTL. It might not give you as much resolution as you would like.

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