Need Help!- machine home

[traxxtito]

hi all
i have a problem in machine home point ,
when i press home push button while machine is stop in any point , machime didn't go to home point correctly in X axis and Y axis... just move short distance in this axis and stop and machine coordinate became X0 Y0 Z0 .
but this place not the spicific place for home point .
you know the most of CNC machine , home point in the left bottom machine work ... now machine define the point it already stop in there as machine home point .
this happend when i press home push button in this position .
pls. advise

[bk5]

Hold P and cancel during power up and try to home again.

[traxxtito]

hi
please can you be more clearly ... pls.
i can't under stand any thing
pls. again
i'm stell stay here ... waiting

[bk5]

Power off machine
hold these 2 buttons on the control: "Cancel" or "can" and the letter "P"
Turn the power back on while holding the buttons.
Once the power is back on, press home button. Machine should go to home point.

[sinha_nsit]

What exactly is the problem and what exactly is done by CAN+P at power ON?

[stevo1]

What kind of MT and what kind of control are you using? Also as Sinha has asked what exactly is the problem? At power up when you do a zero return that position is different then the one when you just press the home switch? Does this position change everytime that you hit the home switch?

Stevo

[traxxtito]

hi all
nothing happened when i prees can.+p and start up machine .
machine problem specifically is :
you know we have machune home point this should be defined to machine , i think this is should be also can't change it by hand .
now here are my problem
in any where i shut down machine . and then start it up .... you know should be define home ref. point .
the current status ... when i start this operation .. machine going to home point in Y&Z Axis but X axis make machine point zero without moving to X home point .
now to avoid this problem provisionally ... i must shut down machine when its axis in home already ... after i set it manually with use G92 and G28 .
i think now all thing become clear for you ..

so pls. can you help me to solve this problem .

[stevo1]

When you power up the machine do you move the axis opposite the homing direction before sending it home. You have to get the axis off the home position before homing them. I always move them even if they are not on the home position.

Where the home position is set up on the machine can be different then what you are use to. This is determined usually by the MTB. I have seen the X-axis home X+, X- and between the 2. So if your machine is not moving when you activate the reference switch and press the axis direction then I would guess one of three things. 1 you are not far enough off the home position. 2 your home position is not where you think it is. 3 if someone changed your parameters there is a parameter that you can change to select which direction the machine can home + or - . When you select the reference switch try moving the X-.

What kind of control are you using? Has this always happened or is it something that the machine just started doing?

Stevo

[traxxtito]

i think your 3rd opinion is true .
but not parameter for direction ... may be another for the distance should axis move to set ... may be it very small.
our control is LNC-M510i ( ISO code )

i wait your replay

[stevo1]

Ok have you tried homing in the -X direction? Does the machine move? If it does move let the machine move to see if it hits a decel and proceedes to home the X. Or move the machine past X center of the table. Your home might be the center of the table.

Have you moved your machine in "JOG" opposite the homing direction before you try homing it??

I don't know what kind of control that is. You do have a Fanuc control correct? It should say on the front of our CRT something like Om, Ot, 6, 10, 15, etc.

Stevo

[sinha_nsit]

Unless your X0 position is different everytime you reference your machine, there is nothing to worry about.

It seems the home position is not where you think it is. You can change your home position, or define additional reference points, if you wish. But, the functionality of the machine will not change. Only the G28 / G30 will have a different response. So, why do you worry? If X0 is not a safe position for tool change, do not change the tool at home position. After homing, move X-axis suitably, and then change the tool.

You machine obviously has incremental pulse coder. With absolute coder (APC), there is no need to home the machine after switching it ON, unless the battery is weak.

[traxxtito]

dear sinha_nsit
morning ...
thanks for your advise ... but i'm sure on machine home point .. it is in the bottom left corner of table .
as you know there are spacific value between absolute coordinate and machine coordinate . this value when i power up machine and axis in anywhere in table ( ABS. x-30 y-30 & MAC. x0 y0 ) .. despite the similar status for x & y axis , machine going to bottom for Y axis but didn't it for X axis , perform the home for x in it place without move to left for X axis .
in any CNC program in the first line ther are G28 X0 Y0 , this point should be the same point i generated program for it .
is it clear friend ? .
i wait your good advise for this ...