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  • Best locking method for sliding plastic parts

    Discussion in 'The main mechanical design forum' started by shanmuk44, Feb 12, 2018.

    1. shanmuk44

      shanmuk44 New Member

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      Hello Everyone,

      Hope All is well...

      I'm working on a concept...I have attached my rough sketch (bad sketches :eek:). It has two parts PART -1 (Base) and PART-2 (Top). Part-2 will slide into the hollow section of part-1 and part-2 need to hold at three different heights (indicated as stage 1 to 3 in my sketch) to carry some load. I was stuck in selecting the locking method for holding the part -2 at required height. Initially, I thought to put some pins through the holes (from all sides) to hold part-2 but I'm thinking for a different and easy way to hold/lock the part-2 at required height. These are 3D printing parts (ABS Plastic).

      Any thoughts/suggestions?

      Any kind of help is appreciated...

      Thank you..
      IMG_20180211_193920_01.jpg
       
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    3. PWASS

      PWASS Well-Known Member

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      Hi

      How much load will the assembly have to take?

      Is part 2 hollow or solid, if hollow, what is the wall thickness?
       
    4. shanmuk44

      shanmuk44 New Member

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      Yes, part-2 is hollow, .5 inch wall thickness. It carries around 3-5 lbs at different heights..
       
    5. shanmuk44

      shanmuk44 New Member

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      Is there any way to hold the part-2 in z-direction at desired height with simple mechanism and also it need to move from one height to another height. For example: operator set the height of Part-2 at stage-1 and do some work and after sometime he set the height of part-2 at stage-2 and do some work and repeats.. so, the locking mechanism at stages need to be simple and strong enough.
       
    6. Dana

      Dana Well-Known Member

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      Take a look at the spring loaded pins you'll find in telescoping aluminum or steel tubing in tents, patio umbrellas, etc. It would be a simple matter to incorporate such a thing in a tab with a post molded into the inner part, the tab providing the spring action and the post sticking into a hole (several holes for the different positions) in the outer piece. For best results you'd probably want two tabs on opposite sides.
       

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