Re: [Emc-users] Question about closed loop CNC

Recently I installed Leadshine's nema 34 stepper with integrated encoder, driver used is also from Leadshine, and it is driven by Pico system's Universal Stepper Controller to which is also attached encoder feedback, so system is in close loop and it works very good. One thing I like about

Re: [Emc-users] Question about closed loop CNC

Hi Chris, At my work place, closed loop systems with steppers has been in use for years. It is a scientific institute and the controller has been developed inhouse. The controller is doing the step generation based on a demanded position. Encoder feedback on the real axis is giving the error.

Re: [Emc-users] Question about closed loop CNC

Chris Albertson [mailto:albertson.ch...@gmail.com] > Sent: January-18-16 11:04 PM > To: Enhanced Machine Controller (EMC) > Subject: [Emc-users] Question about closed loop CNC > > > I've read that it is hard to use steppers for closed loop CNC. If this is > still true could

Re: [Emc-users] Question about closed loop CNC

Hi Chris!  How about that: http://catalog.orientalmotor.com/item/all-categories/ories-legacy-products-stepper-motor-drivers-legacy/asd16a-c?cid=1002=3001170=63126=Item+%23+ASM98ACE=sb=100%7C3001136%7C3001170xx I use it for a long time. Regards, Andrew Вторник, 19 января 2016 г., 10:04

Re: [Emc-users] Question about closed loop CNC

On 19 January 2016 at 07:04, Chris Albertson wrote: > I've read that it is hard to use steppers for closed loop CNC. If this is > still true could some one explain the theory. This may be a misunderstanding. It is hard to do anything useful with an encoder attached to

Re: [Emc-users] Question about closed loop CNC

ired number of > steps in verses the encoder counts as an error that moves the motor in > the correct direction for the required distance. > > John Dammeyer > . > > > -Original Message- > > From: Chris Albertson [mailto:albertson.ch...@gmail.com] > > Sent:

Re: [Emc-users] Question about closed loop CNC

In a closed loop their is feed back, read about control theory. Stepper motors are usually run open loop and no feedback is needed although they may loose steps if not correctly tuned. Nicklas Karlsson On Mon, 18 Jan 2016 23:04:05 -0800 Chris Albertson wrote: >

Re: [Emc-users] Question about closed loop CNC

On 1/19/2016 3:33 AM, Gene Heskett wrote: > 2 optos in series because the BoB you bought is also an isolated version, > _will_ hurt you. Particularly if using a PWM output for spindle speed > control, you _WILL_ have to get rid of it if you want anything that even > resembles linear speeds so the

Re: [Emc-users] Question about closed loop CNC

On 19/01/16 10:33, Gene Heskett wrote: > Something that has not been mentioned here is that a real error because > the stepper has lost a full step or more because it is being asked for > step movement faster than it can maintain lock. > > When that occurs, generally the motor stops/locks, and

Re: [Emc-users] Question about closed loop CNC

On 19 January 2016 at 11:14, Lester Caine wrote: > > The newer 'closed loop' motors are essentially using the same approach, > but rather than simply applying the same power for longer I don't think that this is what the original poster was asking. I think he was just wanting

Re: [Emc-users] Question about closed loop CNC

On 01/19/2016 01:04 AM, Chris Albertson wrote: > I've read that it is hard to use steppers for closed loop CNC. If this is > still true could some one explain the theory. Stepper drivers have fixed current settings for the windings. When the load increases, the voltage applied by the driver

Re: [Emc-users] Question about closed loop CNC

Gentlemen, Having no experience with steppers I will still offer my opinion. Take it as you will. :) The case for steppers seems to hinge on cost ie: steppers are less expensive than servos. Steppers cannot maintain position like servos because of the aforementioned lack of increased power if

Re: [Emc-users] Question about closed loop CNC

On 19/01/16 11:31, andy pugh wrote: >> The newer 'closed loop' motors are essentially using the same approach, >> > but rather than simply applying the same power for longer > I don't think that this is what the original poster was asking. I > think he was just wanting to close a position loop

Re: [Emc-users] Question about closed loop CNC

On Tuesday 19 January 2016 06:31:10 andy pugh wrote: > On 19 January 2016 at 11:14, Lester Caine wrote: > > The newer 'closed loop' motors are essentially using the same > > approach, but rather than simply applying the same power for longer > > I don't think that this is

Re: [Emc-users] Question about closed loop CNC

On 1/19/2016 5:19 AM, andy pugh wrote: > On 19 January 2016 at 07:04, Chris Albertson > wrote: >> I've read that it is hard to use steppers for closed loop CNC. If this is >> still true could some one explain the theory. > This may be a misunderstanding. > It is hard

Re: [Emc-users] Question about closed loop CNC

Just needs the loop closing and a sensible driver I think. eg :-

[Emc-users] Question about closed loop CNC

I've read that it is hard to use steppers for closed loop CNC. If this is still true could some one explain the theory. I have a small mill with DRO scales that are good to about .001 inch and I'd like to put them to use with my planned CNC conversion. I understand software. I've worked in