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moving problem

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15 Jul 2019 16:16 #139456 by tommylight
Replied by tommylight on topic moving problem
With 20 teeth GT2 you get 4cm of movement for 1 revolution, it is barely usable for plasma with microstepping or 3d printing, but for nothing else.
For anything else you do need reduction.
Also using microstepping will lower the torque so it makes it easier to lose position.

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15 Jul 2019 16:35 #139461 by RoberCNC
Replied by RoberCNC on topic moving problem
Exact! That has been my big mistake :laugh: , it has cost me a lot of time and headaches until I have noticed and I blaming the cheap Chinese tb6600 :S After all it may not be so bad to start and you should invest money in precision ballscrews

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15 Jul 2019 16:54 #139465 by Clive S
Replied by Clive S on topic moving problem
Tommy
Was this www.ebay.de/itm/German-Ship-No-taxes-CNC...c:g:vS8AAOSwkNZUq6fz

The digital one or analogue?

Thanks

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15 Jul 2019 17:50 #139478 by tommylight
Replied by tommylight on topic moving problem
Not sure, but also not sure it matters, they should all be digital as they use 0 and 1 to work, might be something on the drive circuitry that they refer to as digital or the use of a DSP ?!?!?!
The following user(s) said Thank You: Clive S

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01 Aug 2019 08:09 #141078 by RoberCNC
Replied by RoberCNC on topic moving problem
good morning to everybody!

I've finally installed the precision ballscrews and now all the axes are really fine. My new task is to install all the limits, I have an idea to configure them as NC, if I understand well with what I have read here I must join the GND to the common (my card is a 7i76, not E or D) and the NC to the pin input that I configure.

Is this correct or should I deny the pin? Maybe it's easier to put them as NO? Let's see what you can tell me guys, thanks.

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01 Aug 2019 11:39 #141089 by tommylight
Replied by tommylight on topic moving problem
NO should be wired in parallel
NC should be wired in series
This is if you are using only 1 input for all limit switches.

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01 Aug 2019 15:02 - 01 Aug 2019 15:03 #141112 by RoberCNC
Replied by RoberCNC on topic moving problem
But i must wire voltage or ground? I should use diferent inputs for each limits and + - , i have imputa enough
Last edit: 01 Aug 2019 15:03 by RoberCNC.

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01 Aug 2019 15:28 #141118 by tommylight
Replied by tommylight on topic moving problem
So i do not have to read everything again, what board are you using?
Or is it directly to parallel port ?
For parallel port you need to wire one pin of the switch to the input of parallel port and the other to the ground. You can use NO or NC as you can change that in hal.

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01 Aug 2019 15:37 #141119 by PCW
Replied by PCW on topic moving problem
For a 7I76, the switch common is field power (normally 12 or 24V)
NC switches are recommended so a broken wire causes a fault
When NC switches are used with a a 7I76, you will need to use the -not hal pins
The following user(s) said Thank You: tommylight, RoberCNC

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01 Aug 2019 15:53 #141120 by RoberCNC
Replied by RoberCNC on topic moving problem
Thanks a lot PCW, you mean something like the attachment for each axis, then edit the hal file and add -not
Attachments:

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