Re: [CAD_CAM_EDM_DRO] Newbie ¡¡¡Help!! ! with system
Posted by
Les Newell
on 2002-04-08 09:15:00 UTC
Sounds like you are trying to drive the motor too fast. Max speed=6000
sounds rather high to me.
try
Max speed =500
Accel=1000
Max start speed=100
Pulse width = 10 (this should be OK for a P266-P300)
Use jog to move the axis while testing as this will move it at max speed.
If the motor works, first take down the pulse width until it stops working.
Then multiply that value by about 1.5.
Now try increasing max speed until the motor starts then stops and whines.
Decrease the max speed to about 75% of this value.
Increase acceleration until the motor fails to keep up then decrease it by
about 75%
Increase max start speed until the motor fails to start. Divide this by
half.
You will now have a starting point that roughly works. Find a nice
complicated job and run it. If the motor loses position then try reducing
the acceleration, max start speed and max speed parameters.
It can take a long time to get a stepper system tuned to perfection. I have
spent a couple of days on mine and am still not totally happy with the
settings.
Les
sounds rather high to me.
try
Max speed =500
Accel=1000
Max start speed=100
Pulse width = 10 (this should be OK for a P266-P300)
Use jog to move the axis while testing as this will move it at max speed.
If the motor works, first take down the pulse width until it stops working.
Then multiply that value by about 1.5.
Now try increasing max speed until the motor starts then stops and whines.
Decrease the max speed to about 75% of this value.
Increase acceleration until the motor fails to keep up then decrease it by
about 75%
Increase max start speed until the motor fails to start. Divide this by
half.
You will now have a starting point that roughly works. Find a nice
complicated job and run it. If the motor loses position then try reducing
the acceleration, max start speed and max speed parameters.
It can take a long time to get a stepper system tuned to perfection. I have
spent a couple of days on mine and am still not totally happy with the
settings.
Les
----- Original Message -----
From: "ajv2803959" <antonio-ximenez@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, April 08, 2002 3:13 PM
Subject: [CAD_CAM_EDM_DRO] Newbie ¡¡¡Help!!! with system
Yesterday, I was testing a hobby system, that I bought 6 months ago.
I have had a bunch of problem that I hope groups could resolv for me.
The software I am using is Turbocnc v3.0g+. Motion important
parameters are:
Max Speed = 6000
Accel = 1000
Max start speed = 500
Pulse width = 50 microseconds
No backslash compensation.
Drivers are L297-L298 Combo, exactly SD1v1.2, from Dean Hobby cnc
website.
Cable to connect SD1v1.2 to motor is unshielded twister pair (I mean
network cable but unshielded), 1 pair per phase, finishing in a 5
pins microphone socket, male in driver female in motor.
Power supply is a toroidal 24v 6amp, is giving 33volt aprox. OK
capacitor is rated at 15000 microfarads 100 volt
OK. I am ready fo running stepper.
I made G00 X1000. The motor run very smooth.
I made G01 x900 F100. The motor began running well, 2 0 3 turns
after, shaft motor make steps forward but make some step backward, in
forward-backward motor loss torque, beacuse I am be able to turn the
shaft in the opposite direction. I don´t understand the backward
movement.
If I put G01 X900 F200 the imprecision is much worst.
It`s the same sympton with the 3 drivers.
I gave a try to EMC, with freqmod, the result was letal.
The symptom was similar at TurboCNC, but in trial, I made a shorcut
between phases, it made a reset in PC.
Parallel port don´t work at all. Driver lights power on and idle
leds, but in rapids G00 X1000 motor turn 2 or 3 biggers steps no
more, but buzz well i hear the ramping in acceleation.
With other driver G00 X1000 is fine.
I think some thing is wrong in driver, could you give any
advice, in order to get working the driver properly again.
The only tool that I have is a polymeter.
So could you give advice, in order to get smooth motion with the
others two drivers without damage?
Thanks in Advance
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