Aaron,
all depends on the construction of the machine.
I built a 1.5 x 2 m gantry used for foam, wood and aluminum.
Specs: Double X-axis with 25 mm linear guide rails, Y and Z using 20 mm
rails with 2 carriages on each rail. Stepper motors are 6.4 Nm (NEMA34
size) with stepper motor drivers using 16 micro steps, 5.6A current and
a 42 V power supply (14 Amps) using a 1 to 1 pulley ratio on ball screws
with 5mm pitch.
This is able to move the X axis at 2000 mm/min, Y and Z at 2200 mm/min.
Using a 3 to 1 pulley ratio speeds up to 6000 mm/min are possible but
the pulleys ran of the ball screws due to improper drilled holes ...
With the ball screw nuts removed I need about 6 kg force to move the
X-axis (measured using a scale beam). Nuts are adjusted to have no play
The speed is limited due to the motor losing steps: I cannot get the
motor moving reliable at more than 24 kHz (16 micro steps, 1.8 deg./rev
= 455 rpm) even if the motor has nothing connected.
I still have to try other stepper drivers to see if that changes the
max. speed.
Regards,
Rob
aaron Moore wrote:
> Hi
>
> Having built a 1.5 m x 1.5 m CNC gantry router used for woodwork, I am
> still amazed that it works as well as it does, however I am now thinking
> that the axis should be moving a little bit faster ( I recently costed a
> job that would have taken 15 hours to cut which seems a bit excessive).
>
> It is set to run at 15mm per second max velocity, above that speed the
> steppers start screaming and miss stepps. I know that the screws,
> bearings and drive nuts are not that well aligned and whip about abit. I
> plan to fix that soon, but I would like to know what sort of speed I
> should aim for. Is there any one out there with a similar set up who
> could tell me what max speed they are working to.
>
> All the best for the new year
>
> Aaron
>
>
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