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Old 04-24-2011, 07:27 PM
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Lu47Dan Lu47Dan is offline
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Default 101 Designs, the tripod build.

I started out to build a folding tripod, but do not have the material to make the hinged sockets for the drill rod to be inserted into on the crown. To recap the information in the thread on getting the two mills.
  1. The drill rod is 1-5/8" in diameter not the 1-1/2" I thought it was.
  2. 1-1/2" Sch. 40 BI pipe will not slid over the drill rod.
  3. The drill rod will not fit inside of 2" X 2" X 3/16" tube.
  4. I am on my sixth design for the crown as of now.
I started on this today with a design idea in my head and went out to find the necessary parts and pieces, when One part of the idea went south it was modified to work with what I had in hand at the time. Then when things started to get too out of hand I decided to order a piece of steel that the drill rod would fit into, but at around $27 for the tube and another $22 fro UPS second day air I decided to build a solid crown out of 2-1/2" X 2-1/2" X 3/16 tubing.
I draw up a design and went out into the shop to start cutting the parts for it but that involved making room for the long piece of stock and cleaning off the welding bench. I got the three leg sockets cut and the 3/8" plate inside to dry off so I can lay it out and cut it tomorrow night.
In the first picture below the silver line is the start of 120 degree leg spacing.
The second picture are the sockets, they still need one end plugged before they can be welded to the spreader plate.
The third picture is the sockets aligned to the layout.
The fourth shows the lay out.
The mock up of the crown (picture three) gave me a start, it does not look wide enough then I realized that the spreader is not in the correct place. Whew I thought I was going to move on to design number seven.
The spreader plate will be 9" down from the top of the sockets inside edge, not at the bottom of it so it will widen the angle out.
Tomorrow after work I will be cutting the spreader plate out of a piece of 3/8" plate. The plate will have a 3/4" hole in the center of it for a forged eye bolt, I am thinking of adding gussets between the the plate and legs for strength.
Once I have the crown built I will have to make a set of feet with chain keyholes in them to keep the legs from slipping out under load. The feet will be around 3" in diameter with a leg on it for the keyhole.
Dan.
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  #2  
Old 04-25-2011, 03:37 AM
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GWIZ GWIZ is offline
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I keep thinking about this thread, toe-jacks.
http://www.shopfloortalk.com/forums/...ad.php?t=27035
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Old 04-25-2011, 07:20 PM
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GWIZ I have these also, if I need them.
Tonight I got the spreader plate cut, the 3/4" hole drilled in the center. I started tacking the tubes on with the idea I would bend the tacks to the proper angle and tack them together at the top. Nope that did not work and since it was raining outside, I decided to punt for the night.
Tomorrow evening I will grind the tacks off and make a jig to hold the tube at the proper angle while I tack it on. Another case of a short cut costing more time then it saved.
Dan.
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Old 04-25-2011, 08:44 PM
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I see you've replaced the Velveeta box with an M&M's tube. Good move.
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Old 04-25-2011, 11:47 PM
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My redneck tripod from years ago:

2" Sch40 w/ 1 1/8" hole torched 2" back from the top, then about a foot of 1" HR stuck thru. The 1" HR has 3/16" holes crossdrilled with a 1/8" welding rod bent into a safety pin and about 12-15" of chain hanging from it. The tripod collapses into a travois when you want to transport it.

I don't/can't use it on a slick floor. It was made for dirt so the legs will stick into the ground and not skate away.
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Old 04-26-2011, 08:15 AM
peterb peterb is offline
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Default some pics of my tripod in action

this tripod was built to move rocks around a water feature that i built and was all made to come apart and fit across the back of my ute. lt is made up of 75mmx3mm duragal pipe and was crimped to socket inside itself using a modified hydraulic hose crimper. the head is hinged so it can be walked aroud most obstacles and by varying how many pipes are on each leg it can be used on steep banks or over trenches. lt has been used around the farm for everything from lifting stumps out of holes and backing tip truck under them to lifting cows with broken limbs. have had one rock hanging off it that weighed in at 1,900 kg as well as a lot of machinery that made trailers and utes grunt. one person can assemble it up to twelve feet high in a couple of minutes
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Old 04-26-2011, 05:43 PM
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That's a slick looking rig.Do you have any close up pictures of the head, and the leg joints?
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  #8  
Old 04-26-2011, 07:49 PM
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Quote:
Originally Posted by cutter View Post
I see you've replaced the Velveeta box with an M&M's tube. Good move.

Cutter, I still have the Velveeta box. The Mini M&M tube holds my automatic center punch, my prick punch and my center punch. IF I put them back in it, it is a simple matter to find them.
Arizionian, a buddy has one built like that. I could have borrowed it but I am finely even with him and do not need to owe him anymore favors, as he is very needy.
PeterB, that might be a future project but right now it is a quick and dirty build.
After grinding off the tacks from last nights failed attempt to position the tube on the spreader plate, I remember my laser torpedo level, it has a digital angle finder on it. I used it to set the angle on the first socket and the spreader plate. Which was held by one of my welders magnets, then I tacked it in place, moved on to the next socket and finished with the third socket once they were all tacked up I welded it out with 7018.
When I finished the welds on the socket and plate I decided to add a safety to prevent sudden and catastrophic failure of the weld joint. There are three of them, one for each socket to plate joint.
I capped the socket with 1/4" plate squares sized to fit into the tube, they were welded in with 6010 root and 7018 cap. I am thinking of adding a plate to the center to tie all three sockets together.
I will add the 3/4" forge eyebolt to the crown tomorrow evening and set up the tripod to see if I have everything right.
I still need to build the chain plate/feet and I will try to get them done tomorrow evening.
Dan.
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Used diesel engines are an adventure anyway you look at them !!
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Hobart 175 Mig
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  #9  
Old 04-26-2011, 07:52 PM
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A few more pictures.
Dan.
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__________________
Tools to Men are like Shoes to Women , you can never have too many !!
Used diesel engines are an adventure anyway you look at them !!
Miller XMT-304 Multiprocess
Miller 10-E Wire Feeder
Miller Spectrum 2050 Plasma Cutter
Hobart AC/DC stick welder
Hobart 175 Mig
Craftsman O/A set
Turbo torch and B-tank
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  #10  
Old 04-26-2011, 10:30 PM
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Quote:
Originally Posted by Lu47Dan View Post

Cutter, I still have the Velveeta box.
There is something oddly reassuring about that on the one hand, a bit disconcerting on the other.
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