7th Axis Welder Setup

    Hello guys,

    I am using a weld gun on a 7th axis. It seems like someone has already set it up. I have no experience in using a weld gun. My experience is all with pick and place.

    To open the gun I am using a Jog command with a group 2 and a position of -127.271
    This seems to work Fine.

    I was also using this method for closing the gun for cap changing and some other things.

    I see in the program a Press_motion P=[1,1] I can run this and it will close the gun and its good. Im assuming this is a close to force type of thing.

    What I am trying to do is understand how this works, how much force Im applying. Also When I try to close on a block of wood "for testing" I keep faulting out. I am assuming because of the thickness of the wood.

    I am trying to come into a cap dresser and I want to make sure Im closing to the correct force and holding it

    Thanks,
    Kevin

    According to their writing, I understand that the welding equipment is defined as an extra axis. To understand how this system works, you need to take a closer look. Resource systems that can be entered through robot menus are usually introduced in two different ways. First of all the values of the robot "Data,Register". All the parameters related to the source can be found there, and the second method is to use the "Func, Grup2" option or when you are in the "setup" menu or directly in the normal program. related parameters. I think that this problem can not produce a healthy solution without knowing the system in detail.

    I am revisiting this application again and was hoping for some help here. On this robot there is an existing program that has a command Press_motion P=[1,1]. This will close the gun, I can see it bend a bit so it seems to have a good force. However I have no idea how much force this is. Also if I had a piece of wood inbetween the gun it faults out. So im guessing there is a thickness setting somewhere. Can anyone help me understand how this command works and where it is pulling its information.

    What I am trying to do is alter this for a cap dresser. So I would need to close to 1" for example @ a force for 300 lbs.

    Thanks,
    Kevin

    Quote from tony gast


    Sounds like you need a servo gun manual and a spot tool manual.
    There is an argument table for the pressure scaling.

    If the robot is properly licensed to you, you can access these from the Fanuc CRC site...

    This is my first weld robot and it was provided by a customer and its used. However I do have many other lr mates and 710s that are registered to us.

    Press motion (1,1) =( start distance schedule #1, pressure schedule #1).
    To find the pressure go to [data] [f1] select pressure this is the pressure table. (You May need to press [prev] to see all pressure schedules)
    Depending on software version this may also have the thickness in the pressure table.
    Depending on software options you may have a tip dress command. If you have that, that is the best way to dress caps. To check go to menu (6 setup) [f1] and look for tip dress. If you have that option use it. To use it simple add the tip dress command to the end of the position. Same way you would for adding a spot weld point. [next] [inst] spot welding, tipdress.

    Edited once, last by JimFc (March 12, 2019 at 1:51 PM).

    Quote from JimFc


    Press motion (1,1) =( start distance schedule #1, pressure schedule #1).
    To find the pressure go to [data] [f1] select pressure this is the pressure table. (You May need to press [prev] to see all pressure schedules)
    Depending on software version this may also have the thickness in the pressure table.
    Depending on software options you may have a tip dress command. If you have that, that is the best way to dress caps. To check go to menu (6 setup) [f1] and look for tip dress. If you have that option use it. To use it simple add the tip dress command to the end of the position. Same way you would for adding a spot weld point. [next] [inst] spot welding, tipdress.

    Thank you very much for this response. What is a start distance schedule? Where would I find this? I do have the thickness in the pressure table. I was trying to use this for dressing, but also for a cap changer. I have to close on the changer at a set pressure.

    Thanks

    What version of software are you using? (Menu) utilities.

    Start distance is an approach distance for the movable and fixed tip. Located under (data) (f1) distance. Which the gun passes through before pressurizing starts. Think of it as an invisible program point above the weld/spot. When you get to welding the opposite of start distance is end distance; will be called ED or BU and is the back up distance after the weld completes. basically how wide the gun opens after the weld.
    our press_motn has (SD=...,p=...,t**). I think It’s possible your distance table is under data, f1, pressure, detail, (weld stroke) detail.

    Quote from kevilay

    Thank you very much for this response. What is a start distance schedule? Where would I find this? I do have the thickness in the pressure table. I was trying to use this for dressing, but also for a cap changer. I have to close on the changer at a set pressure.

    Thanks

    Kevilay,

    Did you give up on this or are you still working on it? I used to work at an FCA facility as a robot "specialist" in the body shop where we have hundreds of 7th axis spot welder robots, exactly what you have described. You will have a pressure data table, a distance/thickness table, and probably a power/voltage table - some weld controllers handle all of this stuff for you and so the robot just has a schedule - "weld type 1" or "weld type 12" as an example would tell the weld controller what type of weld - voltage/power and duration of weld, and the robot would control how much it closed the gun, and how much force to put on the sheet metal before firing the weld. The pressure table should be accessible through Menu, Data, Pressure. Tip dress & change info is also set up in there I think hit F1 (type) then pick the other schedules. Start distance schedule should be inside of the weld utilities on the teach pendant also. That is used to open the gun to a certain distance - in the automotive world they open the gun as little as possible to get the gun in position, and then close it on the sheet metal to fire the weld. (Some robot cells would have each robot doing more than 30 welds in like 45 seconds or less). Hopefully this helps. Keep in mind that some robots need to access the weld schedule that's inside of the weld controller - this is usually done through "Browser" and browsing the weld controller's web page like accessing a website)

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