About zxen

Oct. 9, 2012
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  • zxen commented on SPLatManOz's instructable Matching 3D printed part to RC servo horn7 months ago
    Matching 3D printed part to RC servo horn

    Yes, I had to use the nylon horn too. This really goes to show how inferior PLA and ABS plastic are compared to nylon. My problem is that the horns I'm embedding are too big to integrate into my design - they're all around 6mm thick, plus the tiny black screws are 7.5mm. The smallest horn I have seen is 15mm diameter (circle horn for a micro servo). So you need an area of 6mmx7.5mmx15mm minimum. Also, I have found that using a teardrop arm horn is unstable and create leverage to rip out the screws rather than a more stable circle horn.

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  • 3D Printing RC Servo Splines (Hitec HS-645MG)

    I successfully printed it many times on my Ultimaker2 using a 0.4mm nozzle, but both PLA and ABS ripped at the spline teeth every time. The Hitec horns are made of nylon. Is nylon less breakable or do you think I printed it incorrectly? I have been 3D printing indentations to incorporate genuine hitec horns by screwing them to my prints. Now I am using 9380TH servos, lifting 36 kg and even the nylon teeth are ripping. PLA and ABS don't seem to stand a chance, unless you know something I don't. Are you rotating tiny light objects or are you able to hold heavier objects and move them back and forth quickly? Which plastic do you use and nozzle size?

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  • zxen commented on rickharris's instructable How to make gears easily7 months ago
    How to make gears easily

    I have a 53mm diameter robot arm. The shaft of the servo that rotates it is off-center, obviously inside the arm. The distance from the shaft center to the arm is about 17mm. Therefore the diameter of the pinion gear will be around 34mm. In order for the arm to rotate centered (without blocking the interior wire passages with an attached artificial shaft) is to create inward facing teeth - an internal spur gear with an outer diameter of 53mm. So in the real world, these are the parameters we begin with:Maximum diameter of confinement: 53mmPinion gear diameter: 34mmSo now the question is how many teeth each of the gears should have. I have not found the maths for this anywhere on the internet. This is a real world example, and I claim that all the lessons on how to build gears ignore the most crucial factor when determining the number of teeth for each gear: The confinement area.Can anyone please help who actually has real world experience (so you can relate to building gears other than classroom theory)? Thanks.

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