Planning - Bridgeport Interact 1 linuxCNC Retrofit

cncnoob1979 wrote:

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.

Ok, So my understanding is JohnT had encoders on his servo's, when in fact he had a tach.

Actually, he had a tachometer and a sinusoidal encoder.
I haven't mentioned sinusoidal encoders so far, something of an omission.
These are something a hybrid between an encoder and a resolver. They have an output a lot like a resolver, two sine waves 90 degrees out of phase. But they are created by optical devices, and whereas a resolver will have 1 or 2 cycles per motor revolution, the sinusoidal encoders have a few hundred. With both a sinusoidal encoder and a resolver the interface electronics takes the arctan of the ratio of the two signals to get a position.

So, you need to first decide if the motor feedback is quadrature encoder, sinusoidal encoder, or resolver. The good news is that you can use any of them with LinuxCNC. (and a few more options too)

So If I interface with the servo amp using +-10v command signals and close the loop with the tach then i should be able to use all existing hardware_Provided I can find some information on my servo amps for wiring purposes.

You can test the amps with a a low-voltage battery, but the machine will still move at 15% of max speed with a 1.5V battery.

I found literature for the Servo Amp z15-1A-240 V / z25-1A-240 V. Was buried in another thread, cant remember where I found it.

Now I need to find out about the Servo's. An encoder was an option for this install, and more then likely - was used.
If this is the case and I have a sinusoidal encoder, will I need to change my hardware? John used the controller board for his. I will not have that option.

No eBay APP ID and/or Cert ID defined in Kunena configuration

cncnoob1979 wrote: I found literature for the Servo Amp z15-1A-240 V / z25-1A-240 V. Was buried in another thread, cant remember where I found it.

It looks like the amps take single-phase input. That's a surprise, but rather convenient. It means you just need a transformer.

Now I need to find out about the Servo's. An encoder was an option for this install, and more then likely - was used.
If this is the case and I have a sinusoidal encoder, will I need to change my hardware? John used the controller board for his. I will not have that option.

The two main options for sinusoidal encoders are Heidenhain EXE boxes:

Or the development board from ICHaus.
www.ichaus.de/product/iC-MG

Despite what I have said earlier, I would be tempted to grab those EXE boxes just in case that that price, then maybe put them back on eBay if they are not suitable.

Andy!

Good deal! Just bought all 4 he had available on eBay (exe boxes) - total 132 shipped. If it turns out I don't need them am pretty confident I can get my money plus some. I got the fourth so I can sell it and hopefully recoup my initial purchase price. Now I have to read up on how to use these.. any lead where to get the best information?

cncnoob1979 wrote: Good deal!

It might not be, I can't find anything out about them..

Now I have to read up on how to use these.. any lead where to get the best information?

The best I have found is
www.heidenhain.com/fileadmin/pdb/media/img/598_010-21.pdf
Which does at least show the likely pinout of the connectors.

Searching the internet shows the same box paired with an ROD 456 sinusoidal rotary encoder, so it looks like they are the same thing, at least.

I called HEIDENHAIN tech support and received the Manual and wiring diagram for these boxes. Very strange that nothing comes up on google!

HEIDENHAIN EXE 702B (225-551-02)











Maybe this will help someone else in the future. The issue I have is that I didn't think about the cables for this unit. So I asked if they came with the cables and have yet to receive a response. If the answer is no I will cancel the buy from ebay and purchase just 3 units for the same price but With cables.