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Messages - BR549

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6811
General Mach Discussion / Re: Encoder motor control
« on: May 08, 2010, 09:16:46 PM »
Actually, looking back into some OLD notes  you can have an encoder monitor setup in "brains" to watch the error between the program position and the Encoder position. Then on error STOP.  

Setup a brain to monitor  OEMDRO127,127,129  AND IF the amount of error exceeds a set amount then FEEDHOLD. You could also add a brain to tell you which axis errored out as well.

NOTE: the dros #127,128,129 show the difference in position comparing the Program DRO verses the Encoder DRO. IF all is well then they would read the same as the machine moved

OR you could have it start a program that would stop mach, reset the machine to the encoder position then restart the program from where it left off.

BUT that is NOT going to help you in this case AS you will contantly be resetting the program due to erroring out.

Bandwidth in this case was the amount of error you allow to occur Before the program errored out and stopped mach.


6812
General Mach Discussion / Re: input read frequency?
« on: May 08, 2010, 03:20:24 PM »
HI Ian the mill itself repeats to .0001-4 depending on the time of day and  the probe repeats to .0002-5.

Anything smaller than this I can't measure acurately here.

NOW ARE WE sure we are talkng about the port read frequency being only 10hz? I remeber Brian saying that the ports are read at about 2/3 of the kernal frequency.

How else would it be able to read RPM or encoders acurately.

NOW 10hz is the update rate for the VB/macro system and I thought Brains were faster than Macros.
I also remember testing the faster update rates 50hz and up (nice)
.


6813
General Mach Discussion / Re: input read frequency?
« on: May 08, 2010, 11:44:48 AM »
Ian I have found IF you calibrate your probe to the known probing speed then that accounts for the latency of Mach.

The probe here repeats well inside of .001"

6814
General Mach Discussion / Re: Reversing Y Axis
« on: May 08, 2010, 01:29:25 AM »
;-)

6815
General Mach Discussion / Re: Reversing Y Axis
« on: May 08, 2010, 01:22:52 AM »
Hood, I have Never seen that.  In all the Cams I have used IF I define the 0,0 as top left the Cam will Draw and Post it that way. Now IF you do not define it it will ASSUME the 0,0 as bottum left and Draw/Post it as such.


6816
Chaoticone, If you get a moment could you add a description for each column. I am having a hard time referenceing the old vs new stuff

I am opening with WORKS

Thanks

6817
General Mach Discussion / Re: Encoder motor control
« on: May 07, 2010, 03:00:42 PM »
As Ray said,

It would far simpler to just slow down the Accel and vel of your Z to stop the lost steps. Obviously you do not need the current setting for your normal work(steel,Alum) as you are not getting lost steps. I would try cutting the settings in half(50%) of your current settings and give it a whirl.

Mach will then slow down the process to the slower settings and hopefull avoid the lost steps.

The basic problem doing it with software is the Input update rate in mach is only 10hz the output rate of the steps can be very high. So it would be hard to keep the readings of the DRO and the encoders in proper sync reading wise. The rest is a piece of cake look at DRO and Encoder IF they are within a bandwidth ok IF NOT stop.



Hope that helps


6818
General Mach Discussion / Re: Reversing Y Axis
« on: May 07, 2010, 02:32:21 PM »
IF in CAM you set the 0,0 to the top left then everything will work fine. When the program posts it will set the 0,0 to be top left. That is exactly where you need it to be when you set 0,0 to the left of the stationary side(back jaw ) of the vise.


Hope that helps

6819
THis will do a basic Time to TC countdown based on times derived from the worklog it will ouput the countdown to either the message bar OR a user DRO you would create on the screen.

'Program Load,  Program The Vars to the TC time values derived from the WorkLog
#310 = 0      'Turns OFF Timer
#400 = 0      'Sets TC Var Holder to Zero
#401 = 10      'Start of the TC values 401 = 1st TC time
#402 = 2      '2nd
#403 = 6      '3rd
#404 = 0      '4th, etc

***************************
'M6Start (add too)
setvar(310,0)         'Turn Off Timer
SetVar(400,(Getvar(400)+1)      'Up the Tool# count
IF GetVar(400) = 0 Then End      'IF var value = 0 then end
IF GetVar(400) > 0 then SetVar(301,400)   'IF Var has a value then process
End   

***************************
'M6End (add too)
SetVar(310,1)      'Turn ON Timer
End

**************************
'M1030 End ( Create) , Is called by the M30/program end
Message" End Of Program Run"
SetVar(310,0)      'Turn Off Timer
'SetOemDro(1000,0)      'Reset Dro
SetVar(400,0)      ' Reset TC Vars to Zero
SetVar(401,0)
SetVar(402,0)
SetVar(403,0)
SetVar(404,0)
SetVar(405,0)
SetVar(406,0)
SetVar(407,0)
SetVar(408,0)
SetVar(409,0)
SetVar(410,0)
End

***************************
'Macropump (add to)
If Getvar(310)<>1 Then End      ' IF Timer is OFF then end
settimer(10)
SETvar(298,(GetTimer(10)))
setvar(299, (Getvar(299) + (GetVar(298)/60)))
Setvar(301, (Getvar(300)- Fix(Getvar(299))))
Message" Next TC Due In " &getvar(301) &"  Minutes"      'Use IF you use message bar
'SetOemDro(1000,Getvar(301))          'Use only if you use a DRO to display countdown
End   


Hope it helps,

6820
General Mach Discussion / Re: Program home
« on: May 06, 2010, 12:40:52 PM »
Try the GOTOZ (gotoZero) button. It moves the X/Y first then lowers the Z to program Zero

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