Messages

41

General Mach Discussion / Re: mach3 estop external switch issue

« on: August 03, 2011, 11:56:11 PM »

ok here is what i have---

if not isactive(input1)  then       'estop active high input to my bob
dooembutton(1021)          "oem button code for reset
endif

42

General Mach Discussion / Re: mach3 estop external switch issue

« on: August 03, 2011, 11:46:26 PM »

That is the way ALL machines should be. Auto restart is a dangerous thing in motion control . You do have the Estop button shutting off all power to the machine right? as well as notifing MACH to go into estop.

(;-) TP

But i don't think it should be like that. Mach3 will be in estop untill i do not twist the estop switch. After twisting it, mach should come out in normal running mode. Is there a way to do it? Will a macropump do it?
if yes then can anyone help me finding out the "RESET" code or statement?

regards,
jasminder singh

43

Mach4 General Discussion / Re: New people welcome !! Come in here and introduce your self!

« on: August 03, 2011, 01:27:39 PM »

hi,
I am jasminder singh age 23 from Amritsar INDIA. I got into cnc and mach3 2 years before when i saw some guys on youtube running lathes using an ordinary computer. I started reading cnczone and mach3 forums and built a lathe with an atc (even i am surprised how couild i do it). i had some experience with manual lathe before so it was a little easier. Everyone here is very friendly.
I wish if a day was mach's day in a year, when all the cnc jerks could enjoy some beer together somewhere (some could have scotch also)

jasminder singh

44

General Mach Discussion / mach3 estop external switch issue

« on: August 03, 2011, 01:11:37 PM »

hello friends,
i just added external switches to my lathe (mach3) including an estop. Everything just works fine. When i push the estop button, the mach enters into reset mode but when i twist or unlatch it, the mach still remains in estop mode and i have to click the reset button on mach3 screen using my mouse to get to the normal mode.
Where is the problem? I have wired estop as active high and my switch is NO.

hope someone has an idea out there.
regards,
jasminder singh

45

General Mach Discussion / Re: Gaining steps...maybe? with Servo Drive

« on: August 03, 2011, 01:04:44 PM »

I am scratching my head on this one so I thought I would consult the Hive Mind. I am having an issue where my Z axis on my Mill is gaining steps. If I move the z head down 1" I get exact motion. If I move the z axis up, I get between 1.008" and 1.015" of movement (not lost steps, but gained steps). I do not think it is slop in the system because the error is cumulative and based on the feed rate. the slower I move the Z the greater the error. If I do a test program that moves the head +1" then -1" and runs the cycle 50 times. at 40 IPM I get a total accumulated error of about .015" if I run the same program at 5 IPM I get a total accumulated error of .05"-.075" or more!!

I am using Gecko Servo Drives and the servo's are from Industrial Hobbies. I am using Bob Campbell s break out board as well.

If anyone has any test suggestions I am open.
So far I have tried
- re tuning the servo drive with no effect.
- check the ball screw and bearing to make sure it was not moving in and out.
- Backlash on my Ball nut is approximately .003" (its a heavy mill head so preloaded nuts dont really work so good)
- adjusted the motor acceleration way down to be sure I wasnt loosing steps that way.

I have had this machine for 5 years and it generally has run well, this is a new development I cant seem to sort. anyone got any ideas.

Chris

friend,
I had same issue while using a stepper driver but it turned out to be a bad direction pin on my parallel port.

46

General Mach Discussion / Re: mach 3 turn thread pitch changing

« on: April 24, 2011, 11:06:36 AM »

dear rich,
longitude gain means: feed not changing with the change of rpms.
Do you thread on mach?
if yes then please post an example code
g76 then what after and before?

i didn't get an example any where.
thanks for help,
jasminder singh

47

General Mach Discussion / mach 3 turn thread pitch changing

« on: April 23, 2011, 01:18:57 PM »

hello friends,
i am a beginner to mach 3 threading. i am using g76 thread cycle to cut 0.750 inch long thread 1/4 bsf type.
Internet says that the pitch for the thread is 0.039 inch. But when i began to cut thread, 0.052 pitch matches the taps i have of 1/4 bsf thread.
i am running the spindle at 900rpm.

The problem begins after a couple of hours of run when the spindle looses some rpms due to thermal expansion. it reads 890 now and the pitch of the thread changes.
Whrere is the problem? a friend at cnczone said that it is longitude gain problem and i should use cut/rev mode. But i am already using it in the beginning of the program.
ex:
t0101m6
gox1 zo
g95
m3s900
g76 x0.950 z-1 blah blah blah

where could be the problem?
I am scraping a lot of parts that i make after an hour of run of the machine.
thanks hood in advance for the previous and future help.

jasminder

48

General Mach Discussion / Re: mach3 turn spindle dro not working, spindle speed changing while jogging

« on: April 06, 2011, 01:33:50 PM »

Following on to the previous answers I have tried all the actions suggested and still cannot get the speed read out to indicate.
If I rotate the spindle by hand with the diagnostic screen on I get a green light each time the magnet passes the hall effect chip
When I first got it  going all worked ok and I even cut my first screw. However without any speed indication I am stuck
The installation is on a Myford ML7 lathe and all other things seem 100%
Wiring and routing of it are unchanged
I get 5 v out of the hall device as it passes the spindle magnet. I do not know how to post an .xml file either.

I 'm  a bit desperate for help and hope someone can do
Geoff Ford Cape Town

dear geoff,
there will be a mch3turn.xml file in your system folders where mach is installed (it is where the macros are saved on you c drive)
have you set up pulley ratio?
it should not be set to 0

49

General Mach Discussion / Re: mach3 turn lathe spindle stalls

« on: March 18, 2011, 10:54:19 AM »

thanks hood.
May be i shud switch to 2hp motor.
My vfd is already 2hp.

many thanks,
jasminder singh

50

General Mach Discussion / Re: mach3 turn lathe spindle stalls

« on: March 17, 2011, 11:28:17 AM »

dear hood,
the motor's full speed is 1370 rpm and at spindle it is 1700 rpm.
1 hp motor.
i use parting tool at 800 rpm (it is about 25 hz at my vfd)
max freq at vfd is 50