CNC router axis running slowly

[JAZZCNC]

Hi Barrica,

Like the guys say we need more info to be able to identify the problem exactly. however, let me explain how and give an example what you have to set for it to work correctly.

The first thing to do is select Micro-step setting on the drive. Now if you're using the parallel port then better to select lower setting as you are limited to the number of pulses the PP provides. So lets go middle of the road and select 800ms.

Next you need to set "Steps per" in motor tuning. Steps per relates to how many pulses are required to move 1mm or 1inch if using imperial.
But first, we need to know the Pitch of ball screws or lead screws so can do little calculation.
So let's work in Metric and say your using 5mm pitch ball screw with no gearing ratios applied. If any gear ratios applied the ratio will have to factored into the equation.

Steps Per = MicrosSteps / Pitch. Giving 800 / 5 = 160 steps per. This # is what you enter into Steps per in mach3 so will give the correct travel distance.

Next setting is Velocity and Acceleration.
How these are set will depend on several factors and why the guys are asking for info like voltage etc. Voltage plays a large part in how fast stepper motor will spin. So if low voltage you'll get lower rpm.
Other factors are things like ballscrew Pitch, type of linear rails ie: Friction, Mass ie: Gantry weight etc. All these play part in how fast the machine can move.

So again let's work low settings to start with then you can increase from there.
Velocity -1500
Acceleration = 400
This will get you moving at 1500mm/min with a steady ramp up to full RPM. This is good first setup speed based on the parameters used above. If your ball screws are lower pitch ie: 2.5mm then these settings will be on the high side and will be best lowered for testing.

Now when you are happy to go faster then Only change ONE of these parameters at a time per Axis and test before changing the others.
What your looking to do is increase until the motors Stall then back off 25% Ie: if reach 8000 then set at 6000. This will give you good safety margin for when cutting and load increases.

Just be aware that you cannot have high velocity and High acceleration. You choose which is most important to you. But must lower one to get the other.

This should get you moving at a reasonable rate. If it doesn't then like Cropwell says check Jog speed isn't set low. If still slow then will need more info and pictures of drives, wiring, Mach3 settings etc