Omher

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  • September 24, 2017 at 10:58 am in reply to: NEED HELP: Problem following a curve trajectory!! #10573
    Omher
    Member

    Hi cmcgrath5035:

    I followed all of your recommendations and it really improved the output of the machine, here’s what I did:
    – Square the machine, it was a bit off
    – Calibrate $_tr, it was pretty close with the standard value, but anyway there was a very small adjustment to be done
    – Added the “mini-flat” to the motor axes
    – changed the small screws for flat bottom ones
    – Applied nail-polish to the small screws,
    – Tighten the belts, I realized that with all the movement these have to be adjusted regularly.

    Here’s what I realized: Most of these adjustment are temporary, because there is a flaw if this OX design, and no mater how thigh you do the adjustment, over time it will fail.

    On a previous post you mentioned:
    An unfortunate side effect of Ox using GT2 belts is the larger size pulley, compared to Shapeoko where $tr=42mm or so. The NEMA23’s provide the additional torque, but the really beat on the set screws.

    1. Could you expand on this?
    2. Does changing the pulleys help alleviate this problem?
    3. any recommendation on pulley size?
    4. Is a pulley the way to go, especially for X axes, would it make more sense to change it altogether to a screw system? (like Z Axis)?
    5. What are the pros-cons of changing X to a screw system?
    6. If it makes sense to change to a screw system for X axis, could you point me to where could I start searching?

    On a slightly different subject, I’ll start looking for a 3D printer, more likely a delta construction. Could you give point me on where should I start looking?

    Thanks for your support and bestregards.

    September 15, 2017 at 5:56 pm in reply to: NEED HELP: Problem following a curve trajectory!! #10564
    Omher
    Member

    Thank you cmcgrath5035:

    I will run the calibration over the weekend.

    My pulley has 2 screws, the second one doesn’t do much as it doesn’t sit on any flat on the axe. As you said adding a “mini-flat” surface may help. I’ll need to look at how hard it is to make this 45 degree flat.

    I’ll keep you informed.

    Thanks and best regards.

    September 14, 2017 at 7:27 pm in reply to: NEED HELP: Problem following a curve trajectory!! #10561
    Omher
    Member

    cmcgrath5035 thank you for your reply.

    Last night I took out all 3 stepper motors and tighten the tiny screws. The one on X was slightly loose.

    My stepper have flats and the screws are centered on the flat.

    It is amazing how accuracy depends on these tiny screws.

    The result is much better now, however it is still slightly deformed.

    Here’s an image of the new output after the adjustment Output after adjustment.

    At this point, I’m not certain that this is as good as I’ll get.

    More important, I hope you and your beloved ones are OK after Irma. In my prayers.

    Best regards

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