Scissor mechanism
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scissor mechanism
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A scissor mechanism is series of supports that are linked in an x pattern and can fold and unfold through the mechanical linkages. Thus, you have a mechanism that is compact when collapsed, but extendable to meet your needs. I've made this so I can have my xenomorph jump out from a hide at Halloween on unsuspecting prey. Metal tubing would be the most stable but costs far more and that's why Im giving printing a try at is for a cost savings.
Scissor mechanism with 250mm long arms using m12 allen bolts and nuts with washers. Connect arms using three bolts in a cross pattern. Each hole uses 1 long bolt, 1 nut and 3 washers and each arm will use 3 of these hole sets. You can print as many of these as you need to fit your needs, but make sure you are accounting for the load that is intended to be carried. The longer the mechanism, the weaker it will become.
I've attached a diagram describing how to do this names scissorAssemblyDiagram. Callout #1 shows the arms stacked and assembled with a slight space between each component. Callout #2 shows the parts unassembled but what each hole will take to make it functional. Callout #3 is an exploded view of everything stacked
Other pictures are the plateArrangement which shows how I printed the 250mm arm on a 220mm bed. You may have to adjust according to your print bed size but make sure you adjust your bolts, nuts and washers similarly if you do any scaling. TopDownView shows you what a partially assembled mechanism will look like. I will have more pictures later upon request but my phone is tied up loading content to my yt channel currently. The prints are coming out fantastic on PLA with a 15% infill.
Ratio appears to be ~4.35:1 fully extended to compressed. i.e. 2 sections is 18.5" extended and 4.25 collapsed. Determine your desired length, divide by 9.25 and that will tell you how many sections you will need to print. 4' length = 5 sections and it will be a little shy of 48" or 6 sections and it will be long. Within that range though it infinite adjustability.