CV Settings compilation - post up what works for you?

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Nacs Fab
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CV Settings compilation - post up what works for you?

Post by Nacs Fab »

I am still trying to find what would make my old home-built machine run a little better. Here are my current settings:
PPD Mach3 General Config 12-11-19.png
I am still getting some corners not quite square on some internal and external cuts. What do I need to do to sharpen up those corners without making the machine go back to hitting every node and running poorly? Can someone with a dialed in machine post up your settings screenshot? Thanks All! Just trying to fix years worth of nagging problems with my machine.
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Re: CV Settings compilation - post up what works for you?

Post by robertspark »

stop CV on angle > 62º?
why?
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Nacs Fab
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Re: CV Settings compilation - post up what works for you?

Post by Nacs Fab »

Robertspark what setting would you recommend? It’s not cutting right so that could be the issue.
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Re: CV Settings compilation - post up what works for you?

Post by robertspark »

https://www.google.com/url?sa=t&source= ... ef9mRIyb8V

I would try it on 180 degrees, that way it should be turned off and fly around the corners, otherwise... Try 90 degrees as per manual link above

I would also turn ON plasma mode

What is your steps per unit setting? (For each axis)

What is your acceleration setting? (for each axis)
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Nacs Fab
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Re: CV Settings compilation - post up what works for you?

Post by Nacs Fab »

I have also never messed with my motor tuning since getting the machine up and running.
X-Axis.jpg
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Last edited by Nacs Fab on Fri Dec 13, 2019 5:08 pm, edited 1 time in total.
Shop Droids Plasmabot 3.0 DIY 4x8 with water table
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Re: CV Settings compilation - post up what works for you?

Post by SeanP »

These are my settings, works well for me, damn good corners up to 6000mm/min I don't run any faster than that for my cutting.
I have messed plenty with motor setup and that seems about max for mine before loosing steps, my motors are 3.75:1 reduction I think.
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Re: CV Settings compilation - post up what works for you?

Post by robertspark »

The machine is running at about 9kHz (which is good, because it's nice and low, think big chunky steps [the G540 can handle up to 200khz, so you are well within the drives capabilities]).

2716 steps / inch x 200 steps per minuite / 60 (convert pulses / min to pulses per sec... i.e. Hz)

your acceleration is very low (16 inch / sec / sec)..... the "target" number that has been mentioned before is ~ 0.3G (~116"/sec/sec)

have you tried to increase your acceleration to maybe double (32 in/s/sec)?

I don't know what feedrate / material you are cutting but your maximum feedrate is 200"/min (~5080mm/min) [which is not very high]

but lets say your feedrate is 200"/min and the acceleration is 16 in/s/s

the smallest arc you can cut before your machine HAS to slow its velocity is 0.7" radius.

So if you are trying to do very small detail at 200"/min then this will not do a lot of detail for you

If you are able to double the acceleration to 32"/s/sec.... then the smallest arc you cn cut will now be 1/2 at 0.35" radius....



SeanP who just posted his number has a machine travelling a LOT faster than you.....

maximum velocity of 492"/min (more than double your's)

but much more critically to plasma is his acceleration is 88.6"/s/s.... i.e. 5.5 times yours at 16"/s/s...... he will obtain much sharper corners.......
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