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There is a PC based control that will drive analog servos via a breakout board. The system is closed-loop and includes an interface board that accepts quadrature encoder signals and outputs +/- 10...

cnc2

1- the rated value is usually quoted as continuous stall torque
2- Yes. 100w corresponds approximately to 1Nm at 1000rpm
3- Peak torque will be higher but cannot be mainatained for more...

If you are using a ‘True’ closed-loop controller ---- No.

If you are using an ‘open-loop’ controller i.e Mach3 with Gecko drives then Yes.
Gecko drives can convert your DC servo motors...

Rick
The web-site ‘www.3Dmotioncontrol.co.uk’ describes the general features of the system , but I can provide more detailed information if you give me a specific topic to target. You can also...

Doug, I hope I haven’t misled you. I don't think L.M.S has enough significance to register on the 'Google' radar. I run a small engineering business called ‘Lynton Manufacturing Services’ (LMS) . ...

Hi Doug

The Linear scales and your Servo motors / Amps will connect to the L.M.S controller.
As this is a D.I.Y solution it will require some knowledge of the C.N.C architecture in order to...

Seems to be a common scenario. I was in the same position some time back. My Crusader controls were working, but had very limited programming facilities and I was extremely worried about the cost of...

A question which surfaces from time to time on the Zone relates to whether stepper motor control systems provide a full closed-loop facility.

I must confess to having a preference for Servo...

Hi Victor

I have a PC controller which is a closed loop system. It is DOS based and outputs analogue command signals to run DC servo motors but does not provide step/dir signals for stepper...

Good idea KTP. So I can use a Pixie to generate commutation signals and then drive the amp with my own +/- 10 volt command.

steve@reliance, If your servo drives are digital then the chances are,...

Thanks Al. I found the thread, and I have been reading through your posts-
very interesting and a great help - you have pointed me in the right direction thanks again.
KTP, it is also...

Can anybody give me some advice on these motors?
I have 3 Fanuc 'red cap' servo motors model 20S and I need to drive these with brushless analogue amps. using a +/- 10 volt reference signal.
The...

Closed Loop Servo Controller


When I started this project I had some clear objectives in mind (they became a bit blurred along the way !!) and now it is near completion I believe most of those...

Hi all
I have seen some Galil MSA 12-80 dc servo amps at $179. They are rated at 12amps continuous / 25amps peak output ,and seem ideal for my project. But the Gecko 340 is rated at 20amps (at...

Al. I think that the DSP motion control cards (and there are many of them) are state of the art for any PC based system. I looked very seriously at these when I decided to replace the pendant...

I use Linear encoders for position feedback on the mill and rotary encoders on the lathe they both perform well. The table on the milling machine is never more than 1 encoder pulse out of position....

Good question ViperTX! I'm waiting for someone to tell me who supplies a closed loop stepper controller.

Hi TIG. I have a 3 axis closed loop servo system which accepts encoder feedback and outputs the +/- 10 volt analogue signals required to drive your motor /amp. The controller is my own design and...

Thanks James. I think you have provided the answers I expected.

To sum up:-

The source or the step/dir signals i.e THE CONTROLLER is a pc based program similar to...

I appreciate that this thread is for PIC and AVR developers and I confess that I have not used this method for my servo application, but the theory is still relevant and I am interested in the...

Some interesting ideas on this thread!! I agree with Lerman that a dedicated chip to read encoder position is much more reliable than polling (You must be absolutely certain that every pulse is...

There are many ways to crack a nut - as they say - and using the ATmega32 micro-controller is certainly one way to implement motion control. I agree with 2 of Lerman's comments. Redundant PC's make...

Very interested to read about your new project and also encouraged to see you are thinking servo. I have just completed my project ( No! I don’t think this project will ever be complete but it is now...

During a machining cycle the torque requirements can vary considerably due to changes in feed rates, depths of cut, material hardness, cutter speed etc. Surely the purpose of a servo system is to...

Thanks ESjaavik. Linux/EMC sounds like a good alternative RT system, but I still do not understand why backlash is a problem when using linear encoders.

I still think DOS has a future with the...

Hi ESjaavik

If an encoder is being used to control the speed of the motor, then I agree with you, it should be connected to the rear shaft of the motor with zero backlash. I use a tacho for...

EMC? what is it?
I use Linear Encoders to close the servo loop because they do eliminate backlash, and so do many CNC retrofits. However my system is running under DOS on a PC104 card. Should I be...

I prefer tacho feedback and this is the method I use with my control.
Usdigital make an encoder/tacho called ETACH2 this has a sample rate of 10kHz and they claim no cogging or ripple at low speed....

I think a 1kHz position loop and a 100kHz speed loop should provide good control for general machining applications, but I'm not sure that the same encoder can feed both loops. Don't you think the...

I actually considered making that ISA board. I have the ISA prototype boards and the DACs. The DACs are 'DAC8412F' from analog devices
www.analog.com, they are quad 12 bit dacs with bi-polar +/-10...