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  1. #1
    Lee Roberts's Avatar
    Lives in Wigan, United Kingdom. Current Activity: Viewing Moderator Control Panel Has been a member for 9-10 years. Has a total post count of 2,545. Received thanks 161 times, giving thanks to others 652 times. Made a monetary donation to the upkeep of the community. Referred 10 members to the community.
    Hey,

    Just found this video of a 4th axis in action, i liked the design he was cutting and also think its a good example of what you could do if you went for a 4th axis !



    Is anyone looking to add a 4th axis or ?

    Lee
    Last edited by Lee Roberts; 30-01-2014 at 01:01 PM.
    .Me

  2. Is that a 4th axis or merely a rotary X or Y?

  3. #3
    Quote Originally Posted by BillTodd View Post
    Is that a 4th axis or merely a rotary X or Y?
    ?????? Sorry can you explain the difference ?

    .
    John S -

  4. Quote Originally Posted by John S View Post
    ?????? Sorry can you explain the difference ?

    .
    I was expecting to see 4 axes in motion.

  5. #5
    Here's one I did earlier :dance:



    Ignore the dancing about, the X3 was on a transport stand ready to go to the 2006 Harrorgate show and the castors were not locked down.

    This is another gear but instead of being done on a rotary table or 4th axis this one is just done in X, Y and Z fixed in a chuck bolted to the table.



    The model came out of a CAD parts file off the web as an STL file, programmed in Vectric's Cut3D and cut with a 2mm ball nose cutter.
    The video shows the final clean up pass in the opposite direction to remove some of the cutter marks.

    It could have been a lot better if I had reduced to stepover but as I'd not done one before I didn't want to waste a lot of cutting time if it didn't work.

    Never got round to doing a finer pass gear and some bastard nicked that one anyway [ probably Kip :whistling: ]

    Spiral helicals are one of the hardest type of gear to cut and a one off can take well over a day to cut in a home shop.

    .
    Last edited by Lee Roberts; 30-01-2014 at 01:02 PM.
    John S -

  6. Quote Originally Posted by Kip View Post
    Yup that's a 4th axis alright...didn't think much to the "action"....it was cutting fresh air!

    When is a 4th axis not a 4th axis...now that is the question :D
    When there's only 3 axes moving! (else I'll claim by engraver is a 9 axis machine - 'cos I've yet to build the other 6! )

    [edit] Just remembered it has a unused 4th axis already so only 5 to build ;)

  7. #7
    Out of interest, is there a general thread for CNC videos?

  8. #8
    Lee Roberts's Avatar
    Lives in Wigan, United Kingdom. Current Activity: Viewing Moderator Control Panel Has been a member for 9-10 years. Has a total post count of 2,545. Received thanks 161 times, giving thanks to others 652 times. Made a monetary donation to the upkeep of the community. Referred 10 members to the community.
    Quote Originally Posted by tribbles View Post
    Out of interest, is there a general thread for CNC videos?
    No not as such, we do have a Video Gallery but it hasnt been used that much. I add video's as i find them, your more then welcome.
    .Me

  9. #9
    On the subject of axis'sss whats the diference between 2.5d and 3d ?

  10. #10
    Rough difference.
    2.5 D is where the Z axis drops to a predetermined depth and the shape is produced in X and Y whilst at this depth. X and Y can work together like doing a circle and it's called interpolation.

    Typical example is doing a pocket down to 10mm deep in stages of 2mm at a time.

    3D is where the Z axis is changing all the time as the X and Y are moving, imagine machining the aerofoil section on a plane wing.

    Virtually all machines with a powered Z can do 2.5D and 3D, the difference is in the CAM software to generate the code.

    2.5D is relatively cheap but full 3D starts to get very expensive.

    .
    John S -

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