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Thread: Jerky Y axis

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  1. #1
    Join Date
    May 2009
    Posts
    56

    Jerky Y axis

    I have just finished cutting out and assembling the Joe's 2006 router. The Y axis seems to jerk a bit when moving. When I push back and forth I can not feel any looseness. I am just curious what might cause this? I was thinking maybe a bad bearing... Also should I have a bearing on the lead screw at the back of the gantry?

    Also what kind of speed should I be getting? Anything over about 30-40 IPM and the motors stall. I am using the hobbycnc pro board and the 305 motors. Does this sound about right?

    Thanks, Joe

  2. #2
    Join Date
    Aug 2004
    Posts
    3215
    Quote Originally Posted by beamsjr View Post
    I have just finished cutting out and assembling the Joe's 2006 router. The Y axis seems to jerk a bit when moving. When I push back and forth I can not feel any looseness. I am just curious what might cause this? I was thinking maybe a bad bearing... Also should I have a bearing on the lead screw at the back of the gantry?

    Also what kind of speed should I be getting? Anything over about 30-40 IPM and the motors stall. I am using the hobbycnc pro board and the 305 motors. Does this sound about right?

    Thanks, Joe
    you should easily be getting 80-100ipm, not sure what you mean by a bearing at the back of the gantry can you take a picture of the area. Also use white lithium grease on the leadscrews to ensure smooth and easy turning of the leadscrew.
    Thanks,
    Joe

    www.joescnc.com
    joecnc2006 at yahoo

  3. #3
    Join Date
    Jul 2009
    Posts
    13
    Does it run on linear guides or box ways? If it has ways, check gib adjustment. Check backlash for the lead screw.

  4. #4
    Join Date
    May 2009
    Posts
    56
    Ok, I have taken it apart and checked the bearings. I had 3 that were really hard to turn and I replaced them. I installed an anti-backlash nut at the rear of the gantry, where the leadscrew exits the gantry on the Y axis. I am getting about 60 ipm now. The hopping still exists, but very slight.

    When the gantry gets close to the ends of the Y axis (mostly the back end, about the last 20" about 12 in the front) it stalls out. I have checked the lead screw to make sure it wasn't bending and binding it up. I will take some video and post it up tonight.

    I will also get some white grease on there!

    Thanks, Joe

  5. #5
    Join Date
    May 2009
    Posts
    56
    Here is a video of a test cut at 60 ipm I did earlier today. It came out ok, some jaggy edges I am sure is from the hopping.

    [ame="http://www.youtube.com/watch?v=nhu96Szswz0"]YouTube- Test cut on my homemade CNC Machine[/ame]

  6. #6
    Join Date
    May 2009
    Posts
    56

    Not cutting square

    I have got the machine running pretty good now, I am having a really hard time getting it to cut square though. Its off by about 1/4 inch over 30 inches. I used a square to check the table inside of the cross braces and they seem square. The gantry seems to be square, when I run it up to the front of the table the gantry sides are the same distance from the end. Any ideas on what I should check next would be appreciated!

    Thanks, Joe

  7. #7
    Join Date
    May 2009
    Posts
    56
    I was playing with the gib adjustment and I think that is going to fix my problem. Hopefully I will have some time to play with it in the morning.

    Thanks, Joe

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