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  1. #11
    Quote Originally Posted by biketrialsdave View Post
    Thanks guys!

    Quick question (I'll post an update later)....I'm going for HTD 5mm pitch pulleys (as suggested), what ratio should I start with for x and y axis? Also, I assume I want a larger diameter pulley for more teeth/belt contact as opposed to a smaller one?
    If using typical router setup with 10mm pitch screws and steppers then you don't have a ratio so it's 1:1.
    Common pulley size is 20T. Don't go too small because there's not enough teeth engaged. Don't go too large because you increase screw inertia which affects acceleration and power required.

    The main reason for using pulleys is to lessen resonance which affects steppers. The abilty to apply a ratio is just a bonus.
    One advantage if usng say 10mm pitch is that you could apply 2:1 ratio and increase torque and resolution if ever required. Or go other way and apply ratio if you ever needed more speed but with 10mm pitch you won't anyway thats why 1:1 ratio is often used.

    Same with Z axis keep 1:1 ratio but use a 5mm pitch screw for better resolution/torque.
    Last edited by JAZZCNC; 18-11-2015 at 10:07 PM.

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