Messages

71

General Mach Discussion / Re: servo following error problems

« on: April 02, 2007, 08:32:48 AM »

Hi

Art mentioned that I should try using the sherline mode in Mach3. That solved
the noise issue I was having on the encoders. At the time, I didn`t know it
was necessary to have shielded wires for the encoder. I will be replacing the
wires sometime soon.
The strange vibration problem on was x axis was also resolved. I had too much
gain and not enough damping. Before these changes were made I was lucky if
I could run a 3D part at 40 ipm without servo errors. I`ve tested speeds up to
120 ipm without errors. I am now happy again.

72

General Mach Discussion / Re: servo following error problems

« on: March 25, 2007, 10:44:22 PM »

Hi
Here`s what my DIY machine looks like: http://www.cnczone.com/gallery/showgallery.php/cat/500/ppuser/5962/sl/b
The components are cooled with fans and the machine frame is aluminum I-beams

73

General Mach Discussion / servo following error problems

« on: March 25, 2007, 11:45:27 AM »

Hi

My main problem is trying to get a close following error to
maintain accurate part machining. The Rogers Interface card has
software settings that allows a maxium following error before the
system is hauled.
Just today I had some strange results. The first time I started the
machine the following error DRO for the X axis was paging
between .005 and .00055. Twenty minutes latter the axis was
reading .0153 to .0253. It seemed even when the machine was not
cutting a part its following error was increasing. For awhile now I
had the following error set to .020 just to get a few jobs done. Any
following error less then .020 would cause the interface card to
stop the machine.
Latter in the day I shut down the machine and Mach3. I changed the
following error to .003. I decided to run some code at 100 ipm and
on a 45 degree cut plane.
To my surprise the machine cut the part without a fault. Normally in
the past with a .003 following error set, the machine would fault
and stop just as soon as I pressed the RUN button. I`m starting to
think its a grounding issue. I purchased a pre- made encoder cable
from US Digital. I just looked at it and it seems its unshielded.
I`m not certain whats going on with my system but its very
frustrating.

Regards barry
http://www.rogersmachine.net/encoderinterface.html

74

General Mach Discussion / Re: Servo following errors... Please, need some help.

« on: January 22, 2007, 08:12:05 AM »

Hi
Mach3 Version 2.00

75

General Mach Discussion / Re: Servo following errors... Reply for Brian

« on: January 21, 2007, 08:56:47 AM »

Hi Brian
To answer your question: Yes, the DRO`s are showing movement.
Here are more details that I should have mentioned. My system has a stepper motor
on the Y axis with no encoder.
When the interface stopped the machine due to a following error.I clicked ToDro for the X and Z axis only.
I then clicked Start. The machining move was on a 45 degree cut path to the work plane.
The machine started to cut and ran in a strange direction, 90 degrees to the 45 degree cut plane...breaking my bit.
Should I have zeroed the Y axis also. I assumed that I should not, since its a stepper.
The Y axis is not linked to a encoder . Do you think this won`t work because one
of the axis is not a servo with an encoder. I have the following error for the stepper set to 100.00

76

General Mach Discussion / Re: Servo following errors... Please, need some help.

« on: January 20, 2007, 12:52:01 PM »

Hi

The card was working. After 2 hours it just stopped. I have no idea if the error was progressive. How
would one tell if the error was progressive. The part was a relief carving so its not possible to measure
and tell a dimensional error. To my eye the work up until the error occurred looked like it was cutting
with perfect detail.

Thanks and Regards, Barry

77

General Mach Discussion / Servo following errors... Please, need some help.

« on: January 20, 2007, 09:48:53 AM »

Hi
I finally finished installing Roger`s Machine interface card to
monitor following errors.
http://www.rogersmachine.net/encoderinfo.html
I was running a relief caving and thought I was doing fine. Two
hours of machining with no following errors. To my surprise the part
had a error and I was unable to save the part. The cut rate was 55
ipm. I was using a following error of .025.
I`m not certain how to solve this problem ...I`d appreciate some
help.

Mach3 Motor tuning
X Servo 1110 oz*in Vel = 163.8 No gear reduction, linked to a 5 tpi
ballscrew
X Accel = 7.65
=========================
Y 1200 oz*in Stepper Vel= 117
Accel= 17
=========================
Z Servo 360 oz*in Vel 82.8
Accel = 3.15 3 to 1 gear reduction
==========================
The X and Z Servos share a 24 volt power supply. This PS has a
maximum amperage rating of 10 amps. I`m wondering if the motors
can`t draw enough amperage. The current pot on the Geckos is set to
about 75 % of its maximum. I have two power supplies in the control
box
One is 62 volts that run my Y axis stepper. I`m wondering if could
take my 1100 servo motor and run it off of my 62 volt 15 amp power
supply. This might allow all the motors to see more amperage if
that`s the problem. The servo has a max voltage 90 volts. I`m
thinking I could safely run the 1100 Servo on the 62 power supply.

Barry

78

Show"N"Tell ( Your Machines) / Re: Mill | Router

« on: November 11, 2006, 09:30:31 PM »

Hi
Thanks for your reply. Its nice someone noticed. Thanks again, Ynneb 

79

General Mach Discussion / Re: Sound Logic Encoder Interface Problems Homing and Feedhold

« on: October 23, 2006, 09:21:30 AM »

Hi All
I finally got the encoder card to work. It seems now I have a new set of problems I didn`t have
before I installed the card.
For some reason now I cannot seem to home the machine. I made no changes to the homing
section during the configuration of the SL encoder board. All my homing worked before I installed the encoder board.
I can manually trigger the homing switches. Ref All just will not move to the z home then to the y and then
x home.
Also, now when I load code and try to run it I see a message > Nothing to feed hold. As a result, no
axis moves. I can jog all axes but can`t run any real projects on the machine. I asked art about this
and here`s the answer  The message "Nothing to Feedhold" means that the system is sensing the
feedhold being pressed, it will not pop up otherwise. OR, somehow a OEMtrigger is set to pause the system automatically or something..

Regards barry

80

General Mach Discussion / Sound Logic Encoder Interface Problems

« on: October 22, 2006, 10:28:48 AM »

Hi All

I`m wondering if anyone can help me get my interface card working. I had a hell of a time
getting the second parallel port card to work but now it is. I have my X axis servo wired into
the new interface board but for some reason I`m not getting any movement. I did notice that
the Gecko fault light is always on so maybe thats somehow the problem.

Barry
http://www.rogersmachine.net/encoderinterface.html