Problem on a LS-30N

[magzi]

I have the following problem on a LS30N.
Till yesterday, I was able to jog the machine to both axis.
After playing around with (User parameters) -variable limit(prog),+variable limit(prog) etc, Limit lamp on NC status went on.
How I could make it go off?
Where could I find the "overtravel release switch" ?

Having inserted the last known working values (System paramemters) to Stroke end limit+ and Stroke end limit- (e.g XA+=9320.000,XA-=8625.000, ZA+=9260.000,ZA-8010.000) how could I select soft limit values at user parameters in order to jog safely the machine again?

Thank you
Michael

[Superman]

Those User Parameter values are the soft limit extents of the leadsrews ( working area ), if you have altered the values AND then moved the axes outside the "safe zone" you will hit the hard limits ( forcing an A level alarm- only powers down the machine, not the control ) or worse still, overtravelled and really damaged the nut / leadscrew combo.

Look for a button label OT Release or similar ( inside the cabinet or on the control ) it must be depressed while only using the handwheel to come off the limit )

- or - power down the machine and then ( if possible - Xaxis is usually braked ) wind the leadscrew by hand back into the working zone area

[fordav11]

yeah winding the lead screw by hand should work..... usually one end of the lead screw will have a hex on it for a spanner

[Algirdas]

how could I select soft limit values at user parameters in order to jog safely the machine again?
is your machine moving now or not?
if it moves:
move the axis to desired limit position;
parameter mode, on user parameters software limits select appropriate limit
command "calculation" = press F2 or other key, which represents the command or C <write> from text keyboard
* if axis doesn't move, you are either at wrong position of system parameter limits or the axis is outside allowable area.
if wrong system parameter, you can correct it. take care - you can hit hardware limit switch. Then only Owertravel Release helps.
if axis is outside allowable area, find OT switch in control cabinet.

[magzi]

I could talk with numbers in order to be better understood
a) system parameters (XA+=9320.000,XA-=8625.000, ZA+=9260.000,ZA-8010.000)
b) user parameters are the same.
Actual position is XA=11000 and ZA=14000
The machine is moving downwards at both axis (i think is trying to enter into the safe zone) but it is getting very close to the chuck.

OT release is a switch with key on it, which when I use it, still can't jog to opposite direction except the one movement it is still possible.

[Algirdas]

OT release is a switch with key on it
a bit specific, please, how is that? Have never seen like that
user parameters are the same
user software limits = system software limits instantly after system software limits change. For instance, command "add 0" on system software limits makes no change, but user sl = system sl.
The machine is moving downwards at both axis
very good. don't look at numbers, they are wrong now. Concentrate:
1. Find input corresponding to hardware LS. You can use an assistant, looking at LS flag alive instead (it is better)
2. move the axis closer to hardware LS. If observing on screen look at input bit value. If using assistant, move axis till axis LS flag touch LS wheel.
3. set system SL. just press F key (F3 I guess), which corresponds command Calculate;
or command Calculate <write>
If You moved according input bit, you need use OT release and to move axis at least 5 mm away from the overtravel point
4. You have lower limit now. (axis moved downwards = to negative side)
Set the top limit adding 100 000 to lower limit value. For instance, if Your top system SL become 13 777 111 after "Calculate" command, You need to Set (F1 I guess) the top SL to 13 777 111+ 100 000 = 13 877 111.
5. Restart the CNC if required.
6. Now you can move the axis to top position and set system (and user at the same time) SL on the top. Don't hesitate to add more to System SL if needed.
Important:
taking coordinate value, don't look at soft digits, look for system coordinate.
It is much bigger figures and can't be negative. It is marked: system next to it and is never displayed in large characters.

[magzi]

software limits (user parameters) could be negative.
software limits (system parameters)could not be negative.
Am I right?
The software limits (system parameters) for both axis, is values that change every time you replace encoder or you do maintenance to the screws or ball bearings etc, right?
Having chosen these software limits (system parameters), you select or calculate software limits (user parameters) in a way the machine to work in a safe window.
As I see in the manual, the X zero point of the machine is on Z axis which passes from the chuck center. How this point ( X zero) is told to the machine?
I think that this point is essential and must be fixed in the machine. It must be set in the zero point window on the control?
Thank you

[littlerob]

I think that this point is essential and must be fixed in the machine. It must be set in the zero point window on the control?
Thank you

You are trying to make sense of where the encoders zero point is-don't. You are over thinking this-don't. (easy to do when Algirdas is instructing).

Adjust user parameters by small increments in both directions, until you are moving away from the chuck, the direction you need to go. Now continue slowly to a safe tool change position, and call it good.

[magzi]

It is my first contact with cnc lath machines. I am reading and trying things all the time about this LS30N. I am in a situation that can move the machine to X and Z without hitting the hardware LSs and the chuck.
The available manuals are in German which I don't speak. So, I assume some things. The problem I am facing is how to find the zero point in Z and X axis, before each tool offset setting.

[Algirdas]

1. congratulations.
2. there is the M25 function - chuck and tailstock barrier interlock. this is very useful, because it works accounting tool offsets.
3. German knowledge wouldn't help much reading Jinglish book. Look at illustrations and practice.
4. Normally You fix the drill (center drill) in a tool holder and You set it's center as it is X=0 for the turret.
It is not necessary, if You will use all tools including these axial with both offsets.
It is easy and worth to do. Procedure is exactly the same: using measurement equipment You place axis in desired position and calculate desired value (0 as usual).
Z axis zero. It also can be at any desired position and can vary from one part program to another and inside part program, no problem. It is good to have Z=0 where Your first rough OD insert starts the shape. Or, at jaws face surface.
No need to worry about tool offsets if You changed Your Z=0 or X=0. Everything is recalculated properly without any trouble for operator.