stepper speed very slow

[jonm]

hi
what speed can i expect from a wood router running 3nm nema 23 steppers on 3 axis, using the diycnc sytem 3+ board, 2 amp per phase
24 volt power supply , i can only get about 80mm per min in mach 3 painfully slow

[John S]

:feedback:

More info needed.
What screws and pitch, what microstepping selected ?

.

[Gary]

Microstepping resolution? lead of the screw? or motor RPM? Any gearing or direct drive?
Type of screw Lead or ball?


hi
what speed can i expect from a wood router running 3nm nema 23 steppers on 3 axis, using the diycnc sytem 3+ board, 2 amp per phase
24 volt power supply , i can only get about 80mm per min in mach 3 painfully slow

[jonm]

hi
1/8 step, 3mm pitch one start trapezioid screw, direct drive

[Gary]

That is very slow, you should get far better speed than that.
Is this while cutting or rapid moves?


hi
1/8 step, 3mm pitch one start trapezioid screw, direct drive

[jonm]

hi
just got the router going have a pen fixed to the z so just drawing with g code , as the z axis travels along the steppers pitch ( as in sound) gets higher every two or three seconds

[tribbles]

That sounds like acceleration could be way way way too low - if the pitch gets higher every so often, then it's probably ramping up.

[irving2008]

I would expect those steppers, even on 24v, to handle 2000 full steps/sec easily, thats 10rps, 600rpm or 1800mm/min with little load...

80mm/min = 26rpm = 0.43rps, 86 full steps/sec

have you told MACH3 you are using 1/8 step?

It does suggest your MACH3 settings are wrong...

[HiltonSteve]

It does suggest your MACH3 settings are wrong...

Just about to say the same thing....

Take a look at the attached image which are the MACH3 motor tuning settings for my router and let us know what figures you have, don't use these settings as they will be incorrect for your machine.

[jonm]

hi irving
i have the "steps per " in mach set to 533.3
200 X 8 = 1600 divided by the screw pitch which is 3mm = 533.3
maybe i am missing something here

resolution seems good i drew a 300mm diam circle and measured it to exactly 300mm

but the speed is very slow

[John S]

Are all the axis free? no binding ?

[jonm]

yes john everything seems free without the screws attached light finger pressure will move them

[HiltonSteve]

It is the velocity and acceleration figures that adjust the speed, what are they set to?

[jonm]

1072hi
i have tried various settings in here

[John S]

Right the maximum you can do with this is 177.18mm / min if it can get up to speed in time hence your 88mm/min or suchlike.

Leave the steps alone and increase the velocity to 2,000 to start and acceleration to about 150 as a start point.

.

[jonm]

thanks john
so my steps are set right , will try the settings you suggest, i knew i should be able to get a bit more speed somehow, if i can even get to 1000mm a min i will be happy

[jonm]

managed to get my speed up , wired the steppers bipolar single coil
at 2.5 amps the 3nm motors are down to about 2nm but the speed has increased quite considerably can get about over 1000mm/min

[tribbles]

If you increase speed, then the torque will inevitably go down.

What was the problem?

(Glad you got it sorted!)