Need Help!- spindle motor

[heilcnc]

i am starting to design a gang tool lathe just getting the parts together right now
i want to be able to tap on this lathe can you reverse a dc motor fast? i will be using a kb speed controller can you reverse it if you use brake to stop it before you reverse it and use floating tap holder for delay will this work any help would be great thanks all

[Al_The_Man]

There are basically two types 2 quadrant and 4 quadrant, the 4 quadrant has dynamic braking and reversal by reversing the polarity of the input, instead of reversing the armature leads.
Al.

[heilcnc]

have a little more on that in simple terms?

[Al_The_Man]

The 2 quadrant SCR drive has a 0 to10v input, either by potentiometer or 0 to +10v analogue input.
When the input is reduced, the motor will decelerate at a rate depending on the settings but there is no braking in effect, to reverse the motor on this type, it is usually necessary to reverse the armature polarity by conductor reversal.
With the 4 quadrant, there is ±10vdc input capability which will go from full forward to full reverse from one input, there will also be dynamic braking which has the ability to bring the motor to a stop very quickly under electronic braking control.
Both versions have the feature of tach input for more precise speed control.
One version is http://www.kbelectronics.com/data_sheets/kbmg212d.pdf
Al.

[heilcnc]

THANKS

[Ashish B]

Hi

I am undergoing through the same problem.

==> After M19, my spindle orients properly but it jerks suddenly

==> Also if i rotate the Clamped spindle by hand it moves 2 to 3 degrees & again tries to restore its original position.


I think i should increase the clamping force on spindle after M19 - BUT

1. Is it possible to change through Parameter Setting ?
2. What is the recommeded force ?
3. What is maximum force & need to know if any consequences are there if the force exceeds maximum limit ?

Thanks...Need Help Urgently.

Ash

Also attaching a parameter dictionary for easy refrence.