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[Nr1madman]

UC have a USB or ethernet solution, Jazz was comparing using a PC with PP for step generation. UC cards are step generators. It gets confusing because like me nr1madman is using a cheap PP BOB to connect to the steppers, switches etc.

but the connection to the PP BOB is running a lot faster than if it was a PC PP. A few people have warned that using that cheap board will limit upper performance but I was told you will be able to run at least 50khz per axis with that cheap board connected to a step generator if you need more you need a better breakout board. For my Mesa card it's £100 for the better BOB so I'm happy to use my existing BOB for now and 50khz is actually a lot depending how you set microstepping.

And just to clarify (I have no clue)
If running 1600 microsteps and 10mm pitch screw with the standard 200steps/rev motors.. how fast will 50khz get me? :D

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[Desertboy]

And just to clarify (I have no clue)
If running 1600 microsteps and 10mm pitch screw with the standard 200steps/rev motors.. how fast will 50khz get me? :D

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LOL I'm going to run 16 microsteps ;) so 100 times less

Jazz is the man to ask but I think

50000*60 == 3000000 pulses per minute /1600 = 1875 revolutions per minute I think, times that by pitch for distance.

[Nr1madman]

LOL I'm going to run 16 microsteps ;) so 100 times less

Jazz is the man to ask but I think

50000*60 == 3000000 pulses per minute /1600 = 1875 revolutions per minute I think, times that by pitch for distance.

Hmm... I might be over thinking this!

Maybe I was thinking about 1600 pulses so 8 microsteps per step.. have to rethink :D

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[Desertboy]

Hmm... I might be over thinking this!

Maybe I was thinking about 1600 pulses so 8 microsteps per step.. have to rethink :D

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That's ok because I should have divided the last one by 200 ha ha ha forgot the steps.

[Nr1madman]

Alright.. now Im really really tired of wires :D

Got the pc working and installed uccnc sucessfully!! Makes me want to scream in joy!

As Ive said before Im following a schematic I found on the forum.
But in this schematic the limitswitches power a relay and this enables a signal to the bob.

Shouldnt the limitswitches be connected with the estop circuit and stop the main relay from latching?
That way the power would be cut if a limit is breached?

Otherwise the axis that hits a limit might continue if there is software malfunction?

[Clive S]

Do you have soft limits as well? It's all debatable but hitting the limits say while jogging should not (in my opinion) be an E-Stop as it is not an emergency

[Nickhofen]

Robert in the name of Odin, can you share the schematic, or point the thread? :-)

[Davek0974]

Do you have soft limits as well? It's all debatable but hitting the limits say while jogging should not (in my opinion) be an E-Stop as it is not an emergency

This is why I would always recommend running soft-limits. IMHO the type of machine decides the limit system used - A stepper drive is safe if it runs away and hits a stop, the steppers will stall so I would forget limits altogether and fit a home switch plus soft limits, nothing more.

On a servo drive, mechanical breakage is very easy so i would fit hard limit switches wired to the servo power/estop circuit contactor, forget the software, just kill the power. Then fit a home switch and use soft limits to ensure you cannot jog into a limit, ever.