I have one of these dividing heads, and would love to use it as a 4th axis on my CNC machine- but the backlash is large, and you cannot overshoot and come back with CNC. Even if you calculate for it, the side forces will move the head and cause problems.
@@ajaypalsingh549 Stepper motors hold their position when stationary. However, the backlash in the table (several degrees) means that it cannot be relied on- it will move under load. If one could simply put stepper motors on machines and turn them into CNC devices the world would be a simpler place. Sadly, it requires zero backlash bearings and drive, which is where most of the cost is. This video is interesting, but not practical.
@@ajaypalsingh549 You can lock the stepper motor, but the backlash in the gearing means the table will still move. That is why there is a lock on the table- the handle you see on the left of the table. You adjust the position and then lock the table before machining starts. CNC requires a drive that has zero backlash, not possible with a worm drive. It needs a re-circulating ball system or similar. If all you had to do was add stepper motors, CNC would be simple.
I primarily looked at similar projects on the web and checked out what size of steppers they used for similarly sized dividing heads. Besides that, I had about a feeling of how much it takes to operate the thing by hand, just as a sanity check. One thing to bear in mind: Steppers have a lot of torque at low speeds, and that's what they advertise. Even at moderate speeds, say 500 RPM, only a fraction of that is left...
Very nice to look at, but a how-to would be better.
I have one of these dividing heads, and would love to use it as a 4th axis on my CNC machine- but the backlash is large, and you cannot overshoot and come back with CNC. Even if you calculate for it, the side forces will move the head and cause problems.
Most indexers use a brake to lock the position. U'd want to integrate brake control
What kind of motor is suitable so that when cutting is done the dividing head will not lose its position as you the brake is applied
@@ajaypalsingh549 Stepper motors hold their position when stationary. However, the backlash in the table (several degrees) means that it cannot be relied on- it will move under load. If one could simply put stepper motors on machines and turn them into CNC devices the world would be a simpler place. Sadly, it requires zero backlash bearings and drive, which is where most of the cost is. This video is interesting, but not practical.
@@TensquaremetreworkshopI got you sir can we use closed loop stepper with brake for accurate and it will not move under load what would you say ?
@@ajaypalsingh549 You can lock the stepper motor, but the backlash in the gearing means the table will still move. That is why there is a lock on the table- the handle you see on the left of the table. You adjust the position and then lock the table before machining starts. CNC requires a drive that has zero backlash, not possible with a worm drive. It needs a re-circulating ball system or similar. If all you had to do was add stepper motors, CNC would be simple.
Hello sir
What motor you would suggest for a fully functional AUTOMATIC DIVIDING HEAD for commercial use .I would like to my my own in my workshop
Nice .but is it control without any controller like as arduino or something else .
There is a PIC18 microcontroller on the board so there is no need for an arduino or the like
Nice - I'm thinking I need to do something similar - how did you size the stepper motor?
I primarily looked at similar projects on the web and checked out what size of steppers they used for similarly sized dividing heads. Besides that, I had about a feeling of how much it takes to operate the thing by hand, just as a sanity check. One thing to bear in mind: Steppers have a lot of torque at low speeds, and that's what they advertise. Even at moderate speeds, say 500 RPM, only a fraction of that is left...