gmane.linux.distributions.emc.user

Jon Elson | 1 Dec 06:06

Re: Tune up- HAL Oscilloscope.

amtb@... wrote:
> Hi
> I reduced all:
> Default_valacity =1.
> Max_velacity =2.0
> Default_acceleration = 2.0
> Max_acceleration =3.0
>
> I reduced most of them by 2-3 times and graph looks good. I will post it
> in 20 minutes.
> I am interesting why my drive can not output more voltage?
> power not enough? It is SD-94  8 amp constant from servo dynamic
>  http://www.servodynamics.com/sd94p_servodrive.html
>   
It may be a setting in the .ini file, limiting EMC to an output of 1.0 
output units, which may or may not scale to 100% output to your drive.
Default velocity is 1.0 user units/second.. That could be 60 mm/min or 
60 Inch/min, depending on the setting of LINEAR_UNITS in your [TRAJ] 
section.  Also, settings in the Servo Dynamics drive could limit the 
maximum velocity.

Jon

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amtb | 1 Dec 14:26

Re: Tune up- HAL Oscilloscope.

> amtb@... wrote:
>> Hi
>> I reduced all:
>> Default_valacity =1.
>> Max_velacity =2.0
>> Default_acceleration = 2.0
>> Max_acceleration =3.0
>>
>> I reduced most of them by 2-3 times and graph looks good. I will post it
>> in 20 minutes.
>> I am interesting why my drive can not output more voltage?
>> power not enough? It is SD-94  8 amp constant from servo dynamic
>>  http://www.servodynamics.com/sd94p_servodrive.html
>>
> It may be a setting in the .ini file, limiting EMC to an output of 1.0
> output units, which may or may not scale to 100% output to your drive.
> Default velocity is 1.0 user units/second.. That could be 60 mm/min or
> 60 Inch/min, depending on the setting of LINEAR_UNITS in your [TRAJ]
> section.  Also, settings in the Servo Dynamics drive could limit the
> maximum velocity.
>
Hi
i should be able to go up to +10V to -10V. Am i right?
is 1.0 output units means i use only 1.0V out of 10V that system can output?
does pic www.conceptmachinery.com/Sh12.jpg looks ok?
thanks
aram

> Jon
>

(Continue reading)

headers

Anders Wallin | 1 Dec 14:31

Re: Tune up- HAL Oscilloscope.

> Hi
> i should be able to go up to +10V to -10V. Am i right?
> is 1.0 output units means i use only 1.0V out of 10V that system can output?
> does pic www.conceptmachinery.com/Sh12.jpg looks ok?

This looks better, now your Xoutput is not saturating and the error also 
looks trapezoidal. This is a system you can start to tune - the previous 
one was hopeless.
Check with a multimeter or oscilloscope what you get out from the DAC, 
and what the servodrive can accept.
As someone suggested, there might be a speed/acceleration (or 
voltage/current) limit in the drive also.

AW

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noel | 1 Dec 15:38

Re: Tune up- HAL Oscilloscope.

Aram,
2 PID loops are ok to use, just a bit more difficult to tune.
I use Yaskawa motors/drives with the m5i20 & 7i33.
I have to tune the yaskawa drive and motor first with yaskawa software and
get them running smoothly.
Usually I tune them fairly 'soft', that is not very stiff (in velocity
mode).
Then I tune them with EMC.  It can be a bit tricky, but patience pay off.
The motor/drive tuning is very important!!
Also, since there are more parameters, it is a good idea to 'write it down'
so you don't go around in circles.
Good luck.

Noel.
'Roguish' 

-----Original Message-----
From: amtb@...
[mailto:amtb@...] 
Sent: Monday, December 01, 2008 5:26 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Tune up- HAL Oscilloscope.

> amtb@... wrote:
>> Hi
>> I reduced all:
>> Default_valacity =1.
>> Max_velacity =2.0
>> Default_acceleration = 2.0
>> Max_acceleration =3.0

(Continue reading)

headers

Jon Elson | 1 Dec 18:26

Re: Tune up- HAL Oscilloscope.

amtb@... wrote:
>>
> Hi
> i should be able to go up to +10V to -10V. Am i right?
> is 1.0 output units means i use only 1.0V out of 10V that system can output?
>   
I still don't know what interface you are using, but that MAY be 
correct.  It would certainly limit your speed if the drive was assuming 
10 V = 100%.
> does pic www.conceptmachinery.com/Sh12.jpg looks ok?
>   
Yes.

Jon

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This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
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amtb | 10 Dec 04:31

spindle – product by them self????

Hello
I am building light gantry type machine and I am looking for spindle that
can hold up to 0.75 inch cutter. My cutter will be will be long – up to
7-10 inches with index able inserts. RPM up to 3000.
I prepare to cut fume soft material. I would like to hold cutter with
collets similar to 5C.
Is there stay alone spindle – product by them self that I described above?
 Thank you
Aram

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