[bisongear]

i have an Okuma lb15, need to know how to adjust the X home position.
thanks

[underthetire]

You will need to be a bit more specific i'm afraid. Are you trying to comp for centerline, are you just trying to shorten the stroke?

[cncts11]

If you are referring to the X-axis zero position, you need to first check the turret alignment (rotationally and parallel to the Z-axis). Once that is good, mount a bore bar holder on the turret; make sure the active station is stoned/cleaned so it is free of burrs, the eccentiric on the mounting surface is in the right position (the dot faces the spindle), and the bore bar holder is in good condition. Mount a coaxial indicator in the spindle and then sweep the bore bar holder; you need to position the X-axis so the indicator reads the same on the two points that are on the parallel through the borebar holder hole to the X-axis. In other words, draw a line on the face of the borebar holder so it is through the center of the bore and parallel to the X-axis incline. The two points that touch the circumference of the bore are the two points where the indicator needs to read the same. At that point, you go to the "zero Offset" mode and highlight the X-axis position (good idea to write down the old number) and then you should have a "CAL" softkey as shown on the CRT, hit that and then the "WRITE" button. THe X-axis position should now read zero. Record the new number on the Data Management Card, which should be in the electrical cabinet, usually in a folder or sometimes with the software.

[Al_The_Man]

Usually the way to adjust the home limit within one encoder revolution is by the grid shift method, resolution is by one encoder count.
The coarse method would be to move the home slow down switch striker.
Al.

[bisongear]

i want to lengthen the stroke,

[Al_The_Man]

Depends on how much, the coarse method mentioned, by striker will change as much as one encoder revolution, which can be tailored if necessary by the grid shift..
Al.

[underthetire]

Sorry Al, Okuma never had zero return switches or any type of grid shift. User parameters for stroke to adjust it. Won't go past what the machine stroke numbers are. What OSP is this?

[cncts11]

There is no grid shift on an Okuma. If you want to lengthen the stroke of the axis, you need to go to the system stroke limits for the axis (not the variable limits on the user page) and you can open up the value (add to it if you are going positive, subtract from it if negative). Keep in mind, these are set to protect you from hitting the overtravel switch so you need to make sure you don't open it up so much that you hit the switch.

[underthetire]

Actually, if you open up the system limits, you will have to adjust the user limits as well to get the extra stroke out of it.

[bisongear]

can anyone give me instruction on how to do this PLEASE.

[cncts11]

You have to go into parameters, look for the "System parameter" page, and there you will see the stroke limits shown. Put the cursor over the one you want to change and you can change it by either using the "SET" or "ADD" softkeys (you can add a positive or negative value (say .100") if you want to try it that way).

[bisongear]

thanks for your help, worked out fine.

[Al_The_Man]

Sorry Al, Okuma never had zero return switches or any type of grid shift. ?

Ok then, I though it was a Fanuc on it?
Al.

[cncts11]

Actually, if you change the stroke limit (for instance, add "0" to the stroke limit, the user limit will automatically set to the stroke limit setting (this is a shortcut if you want to open up the user limit to their maximum values).