Another "what do I need" thread. Vmc retrofit

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15 Jan 2015 04:17 #55015 by thewho
Sorry for the last replies had to write them on my phone..

Yes the EXE units is an alternative but they seem to be at least as expensive as swapping them for new encoders. I really hate the new(ish) "Customs services" for items in USA. Customs here don´t give a s*it so I have to pay the same fee twice.
I don´t know how much I can expect to get for my tnc150? It might be worth investigating the "sine to square" card in the controller.
Encoders seem to be close to 100€/pcs if the AMT ones don´t work good enough.

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15 Jan 2015 04:19 #55016 by andypugh

I really hate the new(ish) "Customs services" for items in USA. Customs here don´t give a s*it so I have to pay the same fee twice.


That's why I found you one in Germany

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16 Jan 2015 05:46 #55048 by thewho
So I guess my options are:

1. Replace the sine encoders with TTL encoders
+ Availability
++ More people has done it = more info
- Machining needed to fit them
- New wiring needed

2. Buy 4 EXE converters
+ Ability to use old encoders and cables
- Might be tricky to find 4 identical units with good price
- More used old electronics

3. Rip the converter from the TNC controller
+ Ability to use old encoders and cables
+ Cheap*
- I cant sell the old system as a working unit

Thoughts?

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16 Jan 2015 05:54 #55050 by andypugh
An alternative to the EXE units is the IChaus chip:
www.ichaus.de/keyword/Interpolators

There are pre-build demo boards available.

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16 Jan 2015 19:01 #55075 by thewho
That does not sound like an option for me. Preferably I´d buy a controller with all this built in and I only had to connect the cables :P

But besides that. Is it the 5i25 + 7i77 kit I´ll need now when it turned out resolvers is out of the question?

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16 Jan 2015 19:30 #55076 by andypugh

But besides that. Is it the 5i25 + 7i77 kit I´ll need now when it turned out resolvers is out of the question?


That is one option and a common and well-supported one.

You could also still use the 50-pin family, and use:
(5i20 / 5i22 / 5i23 / 5i24 ) + (7i33 / 7i33TA / 7i48 / 7i65) + 7i37TA (x2?)

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16 Jan 2015 22:17 #55081 by emcPT
I would go for (5i25 or 6i25)+7i77. This is more common now (the hardware is also newer) and it is less expensive.
I have both systems working at machines with me, and the (5i25 or 6i25)+7i77 is more simple to integrate on your machine.

If you need to add a full panel, a 7i84 is a good choice to the 5i25 or 6i25.

At resume a full size machine with a panel requires only 5i25+7i77+7i84, that makes a solid package with a good price.

________________
www.eusurplus.com

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16 Jan 2015 23:09 #55083 by andypugh

If you need to add a full panel, a 7i84 is a good choice to the 5i25 or 6i25.


I would suggest the 7i73 for connecting an interface panel. It supports matrix-wired keyboards and/or switches and also has on-board MPG counters. It can also drive an LCD panel if required.

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17 Jan 2015 00:08 #55089 by emcPT
The big downside of the 7i73 is that is 3-5V and you need to use flat cables.
The 7i84 is much faster the integration and you can use 24V, that normally you will have on your setup readily available.

I have both running in my shop and the time that was spent on connecting the 7i73 is quite large. If you need the keyboard or the lcd, then go to the 7i73.

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17 Jan 2015 00:20 #55092 by andypugh

The big downside of the 7i73 is that is 3-5V and you need to use flat cables


The voltage _shouldn't_ be a problem for simple switches, though I guess it could be. I think that the MPG counters are likely to be helpful in many applications (does the 7i84 have them?)

As for the cables, I use these on both 7i73 and direct to the 5i23:
uk.rs-online.com/web/p/pcb-connector-housings/6812871/
(the picture is of 2x2 but they go up to 2x10 at least). They fit side-by-side in the Mesa headers and take discrete wires.)

Ironically the only picture I have is of one of them with a flat cable separated and crimped in:
picasaweb.google.com/1081645046564043805...#5795148928031590754

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