Pimping the mini-lathe

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10 Nov 2020 22:53 - 10 Nov 2020 22:54 #188935 by arvidb
Replied by arvidb on topic Pimping the mini-lathe
Thank you for these videos, they are both informative and entertaining to watch! And inspiring!

(Yes I do have my own Mini lathe of the same sort that I'm trying to get to a usable state.)
Last edit: 10 Nov 2020 22:54 by arvidb.

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11 Nov 2020 08:47 #188966 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
Thanks. Unless you have really serious space problem, I would recommend selling it and getting a lathe with more mass. Even the 9x lathes are much more substantial.
Mark
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15 Nov 2020 11:06 #189449 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
Episode 35 is now up...

Mark
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22 Nov 2020 11:27 #190035 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
Episode36 is now up...

More Maho mayhem.

Enjoy,
Mark
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27 Nov 2020 06:36 - 27 Nov 2020 10:31 #190400 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
For the MPG Jog wheel encoder, can I take +5V from TB2-12 and the common from TB3-12, or are those not a circuit?
Last edit: 27 Nov 2020 10:31 by RotarySMP.

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27 Nov 2020 14:36 #190445 by andypugh
Replied by andypugh on topic Pimping the mini-lathe

RotarySMP wrote: For the MPG Jog wheel encoder, can I take +5V from TB2-12 and the common from TB3-12, or are those not a circuit?


Check continuity between a common on TB2 to the common on TB3.
I would expect the common to be common.

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27 Nov 2020 14:58 - 27 Nov 2020 15:23 #190450 by PCW
Replied by PCW on topic Pimping the mini-lathe
The TB3 common (Input Common) is floating

If its connected to power common (negative)
the isolated inputs will sense +4 to +24V signals

If the TB3 common is connected to say +5V or +24V
its will sense connections to +5V or +24V common
Last edit: 27 Nov 2020 15:23 by PCW.
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28 Nov 2020 11:29 #190506 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
Thanks for trying guys. I have read PCW's post multiple times, but still can't get my head around it. Sorry for being thick.


So If I pull the 5V power from TB2-12 to power the jog encoder, and then reference the A and B signals to the TB3-12 common like this:
1/ Can I damage the 7i96 like this?


2/ Will simple switches between Common and the other output pins then still work? I have a feeling that if TB3-12 common is a ground, then a passive switch to any of the other inputs wont work, as there is no voltage.


I got really close to finishing all the mechanical stuff today, but the touch screen is not working.




Bummer! I damaged the touch screen ribbon cable at some stage. Looks like at least 9 signals are cut, and they are way too small for me to jumper. Wonder If I can get a repalcement, or have to replace the whole €129 screen.
Mark
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28 Nov 2020 14:19 - 28 Nov 2020 14:23 #190518 by PCW
Replied by PCW on topic Pimping the mini-lathe
For the switches, the switch common should be +5V (or +12/+24V if you have it)
and the input common (TB3.12) = Ground=5V or 12V or 24V common negative

That is, the 7I96 isolated inputs require that a voltage be supplied relative to the
input common to actuate the input.
Last edit: 28 Nov 2020 14:23 by PCW.

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29 Nov 2020 11:14 #190599 by RotarySMP
Replied by RotarySMP on topic Pimping the mini-lathe
Thanks PCW. I ran out of time to go in and change that wiring, so this weeks video is not as much done as I hoped...

Mark
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