RE: [CAD_CAM_EDM_DRO] Troubleshooting, part II

Hi, Rick:

What values have you used for min and max velocity as well as acceleration?

Try a min velocity of about 500 and a max of 600. Use something like 50 for
acceleration. Now, these numbers are too low to do any reasonable machining,
but we're trying to get the motors working.

What pin-outs have you set up in TurboCNC?

For Dan Mauch's 2 amp board, X = 2 - Step, 3 - Direction; Y = 4 - Step, 5 -
Direction; Z = 6 - Step, 7 - Direction.

Make sure that the printer port is set to $378

Make sure that the limit switches are disabled. If they're not, you won't
turn the motors even if everything is connected correctly and TurboCNC's
pinouts are set properly.

Do you have an oscilloscope available? How about an analog voltmeter? If you
have a scope, look at the pins while you use the MDI mode to generate a
rapid move (G00 X10 Y10 Z10). You should see a pulse train on lines 2, 4,
and 6. Also, look at the level on pins 3, 5, and 7 and note whether the line
is at logic 0 or logic 1. If you don't see any pulses on the even numbered
lines, you've got to check the configuration. If you see a pulse train, wait
till TurboCNC stops sending the train and issue the command G00 X0 Y0 Z0.
You should see the same pulse train on the even numbered lines and should
find that the odd numbered pins should be at opposite logic levels than they
were when TurboCNC was executing the first command.

Hope this helps.

-- Carol & Jerry Jankura
Strongsville, Ohio
So many toys, so little time....


|-----Original Message-----
|From: Rick Miller [mailto:apollo@...]
|Sent: Wednesday, February 20, 2002 11:29 AM
|To: CAD_CAM_EDM_DRO@yahoogroups.com
|Subject: [CAD_CAM_EDM_DRO] Troubleshooting, part II
|
|
|Hello and thanks to all who replied to my previous post.
|
|I finally managed to get some movement out of my step motors, so I
|think I can (probably) rule out my wiring as being a cause of the problem.
|
|I'm using Pacific Scientific step motors, hooked up to Gecko 201A's.
|
|I still couldn't get TurboCNC to make anything respond. Ditto with
|CNCPro. But, I ran "Stepster" and was able to get it to move,
|though not very well. Here's what happened:
|
|The motors aren't yet hooked up to anything, they're just sitting
|on a bench. I ran stepster, set the parameters & pins
|appropriately and tried moving the X & Y axes. The Y axis would
|move erratically, going between 60-120 degrees (approximately) in
|one direction, and somewhat less in the reverse direction. It
|almost seems like it's being sent too many steps too fast for the
|motor to react appropriately. The X axis wouldn't rotate at all; I
|think it took one step in one direction, then one step in the
|opposite direction when I reversed it, then it wouldn't do
|anything until I restarted the program. Sometimes though the X
|axis motor would emit a high pitched sound, almost like something
|inside the motor was spinning very rapidly, without the shaft moving.
|
|I thought maybe something was wrong with the motor, so I switched
|the motor I had on the X-axis drive to the Y-axis drive, and
|vice-versa. I had the same results; what used to be the Y motor
|was now making that high pitched sound and not moving, and the
|what used to be the X motor was now moving in the same varying
|degrees of rotation that the (formerly) Y motor was.
|
|Any ideas what to look for?
|
|Rick
|
|
|
|[Non-text portions of this message have been removed]
|
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