Step 6: making hoops

We needed some way to bungee the tripod to the dolly.  There just happend to be some  12" long 1/4" bolts in one of the tech shop bins.  I used tech shops two pin roller to bend the bolts into hoops. This was a bit tricky because the roller is not designed for 180 degree bends.  So i fudged a bit and bent by hand.

advise: if you want two nice hoops, make three or four and take the best of the lot!

second picture shows hoops welded to frame.  i cut the remainder of the hoop off with a sawz-all.

third picture shows the painted frame with hoops and the pads to hold the deck screws. 
I really like that you used the nylon tightening straps to secure this to prvent tipping!
I think now that bungees will work better. But we will see what the kids do.
I vote for the tightening straps: Once they're in-place, there's no possibility to move the tripod. Bungees will tend to extend themselves a bit more, allowing tripod to balance and move on the base.<br>Additionally, Alienjones comment is really relevant about bumps. Try that idea.<br>Go on making it a bit better. It worths the effort. You'll have a true professional tool.<br>(Next time don't forget to rotate your photos. :D )
I've made a few of these in my time and I can see an immediate flaw in this one just like the first one I made. The &quot;pipe saddles&quot; holding the rails on the sleepers. My first effort saw me editing out the bumps every time the wheels went over them. Ouch!<br><br>A smoother ride was found by screwing the pipe to the sleepers. Drill a larger hole on top so the screw head can fit through it. The wheels don't feel anything and the whole length is a smooth shoot.<br><br>THe trade off benefit of doing this is when you transport it, you only need slide the rails in opposite directions and the rails &amp; sleepers narrow down to a transportable affair you can put on a roof rack or show ski bars.
Curious how it performed over jointed sections. Wondering if maybe offsettng the wheels woudl smooth things out if it was bumping or jumping at joints. <br>
i used two 20' pieces so there were no joints. good point though - for a longer track (say 30') one would want to make sure that the connection joints did not align.<br><br>with 12 wheels it would probably smooth things out. should be able to get the joint within 1/64&quot; - <br><br>
I wonder if having the cuts in joints sliced at say 45 degree angels and then put the slants so they run veritcal if that too could help in smoothing out the transition ? Not sure how much it would help, I haven't built one yet. It's minus 39 out and since I won't be building one for awhile, I'm just gathering ideas right now. Not sure I could transport 20 foot lengths very easily.Thank You. Happy New Year <br>
You might even want to consider using a larger nylon cutting board as a base instead of wood, no doubt cheaper than seaboard.
that's exactly what HDPE is - nylon cutting boards. Note that i was quoting 1/2&quot; and 1&quot; thicknesses. also - it comes in black or white.
I have seen the same thing sell for far more just because it is related to fishing or the sea. Specialized if you will. I like the instructable, gave me more itdeas, thank you. Happy New Year. <br>
You should put harder wood if you are using<br>an automatic cutter
i should? what do you mean harder wood?

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