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Messages - keithmech

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81
General Mach Discussion / whats happening with threading
« on: December 03, 2008, 12:36:32 PM »
I have just upgraded to the newest level *********xx.20.
Everything seems to work fine but when I tried to thread using the wizard
I get un reliable movement on the z axis.Thread starts-goes in fist cut
does not retract on x comes back addes cut on x and cuts fine for random
number of passes then randomly starts to feed in on or out the x durring the cut
obviously with disasterous results.Is this me or the wizard?

82
General Mach Discussion / Re: Parallel port trouble!
« on: December 02, 2008, 07:31:45 PM »
check your cable as well.I just went through a bad cable issue.

83
General Mach Discussion / Re: servo motor not getting up to speed
« on: November 24, 2008, 11:58:35 PM »
the distance that the axis moves is random from nothing up to a couple of inches.
I guess the best way to test the dir signal would be to swap it over to another axis.
The drive is not showing any fault error.
I have similar drives on another machine so I'll try a swap as well.I also dug out a new
motor that has the encoder on it.Means some rewiring and connection modification .

84
General Mach Discussion / servo motor not getting up to speed
« on: November 24, 2008, 11:32:44 PM »
I do not know if the subject makes sense but here is the issue.
Machine was running great.Using Larken viper 200 drives.I ran a few parts this morning
then set up for another job.Y axis works fine Z axis fine.X axis will not get up to speed
and if I try to jog with the buttons will go ahead then back then ahead then back meanwhile the
distance on the dro is adding up so that the table has jogged itself back and forward but moved very little.
I checked my settings .Checked power to the drives.The encoder is mounted on the screw and not on the motor.
What are the symtoms of a failing encoder?I checked the wiring on the encoder and it is good.Checked the wiring on the motor
Could the motor be failing ie bad brushes?Checked the coupling on the encoder.I need some ideas for morning.

85
Here are some pictures of the Mazak and the Sharnoa control panel

86
yes if I can figure out how to post a picture?? :-\

87
I have been refitting the baby sister to this machine ,the Mazak V5.I attempted a refit with a
Fagor 8055.Good luck getting help and support from those guys.Anyway,I had great success on my Sharnoa
knee mill and a hardinge lathe so decided to fit the Mazak with Mach3 as well.I replaced the spindle motor with a
7.5kw ac motor and vfd.The original dc motor had a 28vdc field.The encoder on the motor was black box as was the motor controller.
I installed an optical sensor on the spindle for reference pulse.The original again was some black box magnetic thing.
Stripped out all wires and started from scratch.I am useing the fanuc motors only I refitted with encoders.I used the breakout board from campbell and the cubloc from comfile.I also used a couple of relay cards from comfile to activate the original relays.The motors are run with viper 200's from larken.I just have to get the tool change ladder sequence done and with fingers crossed make some chips.The down side to refitting machines is it is like a drug once you have started down that slippery slope you constantly look out for the next project.
I would like to do a hxl next.

88
General Mach Discussion / Re: threading not as shown on wizard
« on: March 09, 2008, 08:27:53 PM »
I ended up making a new disk with one slot.It now looks good.
See what a bit of fishing can do to refresh the brain.I had 2 slots before and perhaps it was reading as 2 revs,
 although my spindle speed was right ?

89
General Mach Discussion / threading not as shown on wizard
« on: March 09, 2008, 03:41:20 PM »
I finally have my spindle working nicely.I added a second port and pci card.
Worked for hours with tying to get it going through pins 13 or 15 on my
campbell bob.Put in a cnc4pc c11 bob and the pci card,set up time 10 min.,
turned on lathe and with a few adjustments had the spindle speed perfect.
Tested with handheld tach and the numbers match.Now trying to get the tpi to match
what is programed on the threading wizard.I get about 1/2 the value ie.,
.05 pitch gives a thread with about a .025 pitch on the work.What now.

90
General Mach Discussion / Re: Urgent - Threading not real time
« on: February 13, 2008, 12:04:10 AM »
The motor is 2hp .it is connected to a vfd.All the signal wires are shielded
with the shields grounded on one end.

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