On going chinese 6040 problems

[amxen]

Is it how many steps it takes the stepper to do 1 revolution of the spindle?

[EddyCurrent]

Is it how many steps it takes the stepper to do 1 revolution of the spindle?

It would be with a 1 to 1 relationship but if you had pulleys for example with different diameters, then the ratio of those diameters would come into the equation.

[amxen]

yes it looks like the board has setting of 16.8.2.1 so ill try it set to 2 see if that helps. ill let you know. iv told the seller im not happy with and i would like him to exchange the controller for something thats proven to work or i will open a paypal dispute. i will let you know how i get on

[amxen]

ok here are my findings for today. I changed the switch settings to 2 in the mico stepping (K1 n K2) and the steps per to 80. The motor runs smooth when not attached to the cnc (good i thought sorted ). But as soon as i attach it back to the cnc the motor jams more than before. It has no torque at all i can put my hand on it and it jams. it has not got the power to traverse the axis. i put it back to how it was.

So my thoughts are that the steppers motors are under powered.

But the question

1 will the stepper motors take more power

2 will this board give them more power

3 do i need to replace just the board,? should i get a new all in one board or use the drivers i have from the other kit and just get a BOB that will run these drivers,

4 will the stepper motors from the other kit i have be ok for me to use ?


so many questions

thanks for all the help btw

[EddyCurrent]

Wait, give this a go first, if the velocity / accel in Mach3 is set too high the motor will stall, put the setting back to 2, fit the motor to the machine and reduce the velocity and acceleration until you get good torque.
Even though you reduced the velocity it could well be faster than previous.


Here's a quote from another forum;

"The other day I did switch from 1/10th step to 1/2 step. Seems to operate about the same overall - only MUCH faster. That first rapid move at 180 ipm was a bit shocking. I ended up at 108 ipm - the motors quit stalling then. Probably had to do with the 20 tpi lead screws. The mill runs great! I was slotting ).050" deep with a 3/16 end mill in aluminum at at 18 ipm and the machine seemed happy as can be. And a 0.015" climb cut finish pass left an awesome surface finish. Fun stuff!"

[amxen]

ok just been down the the cave to try again. I have set things like this K1 n K2 set back to 2 again. i set the setting to

steps per = 80
velocity = 1400
acceleration = 150

The Torque is a lot better set like this . I can run with out stalling and it seems faster than before.
I haven't cut anything yet with it like this but i tried to stall the motor by hand and i can but it takes a lot of force to do so.

what is the difference between velocity and acceleration ?


Any way it seems we are getting some where. I will try cutting something tomorrow and see how we get on.

In the long term i think upgrade is in order at some point.
I would like to say thanks for sticking with me on this. I seem to be learning so much so fast. I should be used to that being a heating engineer . All the help has been much appreciated

[EddyCurrent]

Velocity is just the maximum speed your machine can work at, acceleration is the rate of change from one speed to another, just like your car really.

Also there is this from the Mach3 documentation;

"If you can’t seem to get the motors to run smoothly there are a few things to check, first the easy one: Some motor drives need to have a longer step pulse and this can be set by changing the Step Pulse setting. "

I've tried a few values here for my own machine but found no difference I could detect but I'm using digital drivers, it might though make a difference on your machine.