Messages

3071

General Mach Discussion / Re: Steppers are too slow

« on: December 04, 2011, 08:23:06 AM »

needing a cap fitted across the terminals of the PS
The cap provides filtering in an unregulated power supply and additionaly acts as holding tank of energy ( sort of like a water tower which feeds the town with water) thus even with a changing demand it has volume to provide constant voltage. A regulated supply as a unit does all this with circuitry to convert ac to dc, filter,maintain the voltage at some current.
I am going to guess that even though a number of terminals are provided they come from a single end source of the ps's output .

Frankly i am not sure on using a cap on the output of the regulated ps since it's electronics already provide the function of the cap. It may actualy affect that ps. Usualy ps will provide a data sheet and additional instructions / information on their use ( which you have not provided ). So i will withhold comment.  Relative to amperage, there is probably a max running amp and also a surge rating ( when it's first turned on) so when measuring you would see the current draw changing. Your ac circuit should address the surge ie; 1.5 to 2x of running
or max surge , but, irrelevant should satisfy local authority / code on it's use

I am sure the electrical guys in here can provide more insight,
FWIW,

RICH

3072

General Mach Discussion / Re: mark topic as read??

« on: December 03, 2011, 03:44:08 PM »

The topic will not be listed once you view it unless someone replies to the topic when using  " Show unread posts since last visit". 
RICH

3073

Tangent Corner / Re: Theroretical CNC Mill Design

« on: December 02, 2011, 05:46:02 PM »

erofe redro siht ni meth nees reven ev'I tub dearht siht ni sdorw eth lla esingocer I

Not sure what you are meaning as all looks fine on this end.

RICH

3074

Tangent Corner / Re: Theroretical CNC Mill Design

« on: December 02, 2011, 05:39:05 PM »

I don't know what all you guys are on but can I have some?

SUUUUUUUUUUUUUUUUUURE! It's called ELIXIR OF MODERATOR and can be aquired by reading this thread numerous times................... 

RICH

3075

Tangent Corner / Re: Theroretical CNC Mill Design

« on: December 01, 2011, 07:01:57 AM »

buisnessdesigner,
What is IQ?
RICH

3076

General Mach Discussion / Re: Steppers are too slow

« on: November 30, 2011, 07:48:30 PM »

bought ex China ...............the supporting documentation was minimal (read Nil)

Not able to assist without posted info on your drives and bob.
Till then,
RICH

3077

General Mach Discussion / Re: Lost step on large gcode program

« on: November 30, 2011, 06:52:50 AM »

Your comparing the movement of the metal plate ( which is very small ) to the encoder. The bigger the metal plate circumference the better to get an accurate
reading of movement. ie; a razor blade mark is say .005" or so and based on the position and measuring of that mark you can be off by +- whatever. You can do the math.
Gets tougher to try to measure a micro step and the stepper may not even rotate / change when a micro step pulse is sent and the movement can be different over a full revolution.
  
Got to go later......
RICH

3078

General Mach Discussion / Re: TB6560

« on: November 29, 2011, 06:27:38 PM »

Where will I find "motor curves" thats a new term to me.

The seller may have them for the motor. Most name brand motors have motor curves and usualy they are done for 24 or 36 volts along with
the different winding configurations. As a prep on your learning curve  you may want to have a look at the first few threads of this link which is
about a lathe retrofit i did.
http://www.machsupport.com/forum/index.php/topic,12484.msg80823.html#msg80823

Then go to the Gecko Drive site and read all the info that they have posted. Then maybe read Jones on Steppers, if you want to get into more detail,
and you will have a good understanding of the power supply, drive and machine  relationships.

So it seems what goes in  from the power supply via the board gives you more power at the motor

Not quite right in the big picture.  If you were to design a cnc system you would define the machine application, then select a proper machine,
then analyze what the axis needs to do along with the machines physical aspects and after some rationalization select the approriate motors
and power supply to do the  task. Computer may also come into play in all of this.  Once you have determined what is required and selected the
 item off the shelf you then pay the price...or...... go back to the beginning of the design and make comprimises.
You are ask backwards in the approach, let not your heart be troubled, since most of us do the same thing and the saying "doing it right the first
time is echoed".

RICH

3079

General Mach Discussion / Re: TB6560

« on: November 29, 2011, 06:44:49 AM »

Graham,
Difficult to compare preformance without motor curves  at different voltages and amperages . So one would need to see what torque can be had at 3 amps for each motor.
Maybe you will only get half the torque out of the 566 in comparison to the 263 which may have full torque. Additionaly depending on how they are wired that torque value
will change. The max speed of the motors are voltage dependant and also influenced by the motor characteristics. As speed is increased torque will decrease and that also varies
depending on how wired. In general the higher the torque rating the slower the max speed. What you are are interested in is power which is max torque over some speed range.
So the  motor power range will vary depnding on voltage and amperage available and you are limited by the driver and possibly the power supply also. So in general
one would need four different motor curves showing preformance, two for each motor which shows different curves depending on how wired. You need to use curves specific to
the motors and not compare to other manufactures information.

The general statement "in series to give you better torque but slower speed or in parallel lower power but higher speed"  are true, but, one needs to consider / compare
more than that when comparing different motors for an amplication since other things come into play.
 
RICH

3080

General Mach Discussion / Re: TB6560

« on: November 28, 2011, 08:29:34 PM »

Preformance depends on the delivered voltage and amps available from your power supply and driver specs. Not sure if those  drives are limited to 3 amps and 24 volts.
If you had a motor curve you could get an idea of motor torque and speed  you will have. Also depends on how you wire the steppers.
So yes they will work but maybe you won't get more power than you have now.
RICH