Parbuckling is pretty easy and you could certainly get a 30' plate up to where it needs to be. Bents are all raised and braced. Put planks across tie beams to stand on. Run a separate rope through the tenon hole on the top of each post. Tie a knot. The rope is fixed at the top now, runs down under the plate, and back up to 2-3 people on each rope. Everyone pulls, the plate rolls up the rope, you sit it on the tenon shoulder, untie ropes and all is good. I have some pictures but no time to post them.
Brad

Just a comment

The long plates were raised vertically in a horizontal position up the vertical end posts using ropes over the tops of the posts, and man power underneath. Men with pike poles would push and lift, and other men on the ropes would hold. near the top the plate would be rested on round pins driven into predrilled 2' holes. Many men then would be assembled on tempoaray scaffolding to lift the plate straight up and then let down over the tenons, fitting in the braces in the process.

NH

Just a comment

The long plates were raised vertically in a horizontal position up the vertical end posts using ropes over the tops of the posts, and man power underneath. Men with pike poles would push and lift, and other men on the ropes would hold. near the top the plate would be rested on round pins driven into predrilled 2' holes. Many men then would be assembled on tempoaray scaffolding to lift the plate straight up and then let down over the tenons, fitting in the braces in the process.

NH

A visual from last December

Jim, Did you use any references for your designs for the windlass and ginpole. I don't know much about them but would like to learn and eventually build and use one.

As for your ratios, If you make the drum smaller in diameter and the handles radiate further do you get a better lift ratio?

Thanks, mo

Mo:
I discussed all designs with Jack Sobon before I built them.
The gin pole is a direct copy of the ones from Richard Babcock's book. The windlass was a direct copy of one from another book that Jack Sobon showed to me.
It is my understanding that you divide the diameter of the circle created by the end of the handles by the diameter of the drum to get the ratio. So if you decrease the size of the drum you would increase the ratio. But there is a trade off in doing that. The circumference of the drum gets smaller too. That means you'll wind up less line with a smaller drum.

We found this to be a problem when we used the windlass to pull parts of a covered bridge out of a river in southern NH. The block and tackle setup was three pulleys in one block and two in the other. That makes it a 5 to 1 ratio. So with 1 hundred pounds of pull out of the block you could lift 500 pounds of bridge. But the line moves very slow and not very far because it had to go through all the pulleys.

I just measure my drum and it is 7" in diameter and the handles are 98" long so that's a 14 to 1 ratio.

In the pictures I posted above, I was lifting two 8x8x16 timbers. They were eastern white pine, and not green but not dry. I figured they weighed about 249 lbs each. 249 x2 = 498 lbs. Going through my blocks, which are two pulleys each the ratio is 4 to 1. So to lift 498 lbs I need to pull the line at 124.5 lbs. Connecting the line to the windlass reduced the force by 14 so 124.5 / 14 = 8.89 lbs. Very easy to try the windlass at about 9 lbs pressure.

Now someone told me to add a friction drag load to the total due to the line going through all the pulleys. And that this load could be as much as 40% of the total loads. So doing the numbers again 498 x 40% = 199.2 -- 498 + 199.2 = 697.2 / 4 = 174.3 / 14 = 12.45 lbs. Again very easy to turn the windlass at 12.45 lbs of pressure. I actually lifted both beam by turning the windlass with one hand on one handle, and I took a picture of the timbers up off the sawhorses with the other.

And if you wanted to break it down even further and use all four handles with four people that would be 12.45 / 4 = 3.1125 lbs of force on one handle.... Very easy for about anyone to turn.

I was told to only lean the gin pole off of vertical not more than 20°. But in the picture I posted we let it lean way over. This was intentional as we were trying to break something to see if it would fail. I wanted it to break here in my yard where no-one could get hurt if it was going to break, instead of on raising day with the crew all around the frame.

We put twice the intended load on the setup and it didn't fail.
We used it to raise a frame here in my yard one day, and it worked great.

If you need any more info please feel free to ask, and if my numbers or assumptions aren't correct, please let me know.

Jim Rogers

Jim, A couple of questions since you offered. Thanks.

Are there any sizing parameters for the gin pole depending on length and wood species.

What type of line did you use for the guys (I think that is the right term?) Those are anchored to your machine right?

And lastly, Does the ginpole have to be set perpendicular to the pieces placement and does it also have to have the block and tackle directly plumb over its placement too? The angle of the gin pole is not suppose to move right?

Thanks, mo

P.S. Great thread, Cranes can't get everywhere.

Well, we just used what we had on hand, which was eastern white pine. But to be technical you should figure out what your heaviest load would be and make sure a column or post of the size and type that you want to use will hold up that load. Probably strength parallel to grain psi value from the NDS or something like that.


In the failure test, which is the pictures I posted, yes the guy lines are attached to the backhoe fork attachment hooks, as well as the back line. These small white pieces of rope are actually one long piece that I made a loop in at the middle point so that I didn't have to cut it and it would be as long as possible. This was so that I could tie them off to other solid objects depending on the actual location where the gin pole was going to be used.
This/these lines are 3/8" braided nylon.


No, I don't think so, but it does help it to remain stable as the upside down "T" base prevents it from shifting/leaning side to side.

We did this so that when you lower the piece you don't have to swing it out or in to line it up over it's intended location.

When I discussed this with Jack Sobon and the methods he used to raise his own side entry English barn, I asked him how he did it alone.
He told me that he put a peg in his gin pole so that when his timber was raised up as high as it needed to go he could tie off his lift line and it wouldn't allow the timber to come back down.
He also had a "safety line" that when from the top of the gin pole opposite the back line, tied off to something solid on the other side of his yard. This was to prevent the gin pole from going over backwards if the load shifted when fully raised. This seemed like a great idea to me as you are raising the center of gravity of the whole rig when a timber is up there.
He aligned his gin pole to be outside of his building and the lift block was not over the wall posts. After he raised his plate to the top he adjusted his back line and side guy lines to allow the gin pole, and plate to lean in over the post's top tenons. Then with a tag line on one end of the plate, to help guide it, he lowered the plate until the lower end was sitting on the tenon. He then re-tied the line off to the peg in the gin pole and went up his ladder to adjust the plate's alignment to the first post top tenon. Once this tenon was engaged into it's mortise he lowered the plate some more.
We usually have the lift point of the plate just off center a fraction so that one end will hang a little lower then the other end so that we can start with this low end to insert it's mortise onto the corner post's top tenon. Then that post's brace, then the next post down the wall and end with the last post or other end of the plate engaging the other corner post. This way you're not trying to align all post tenons and all brace tenons at once. Now this isn't much but just enough so that you can do this safely and easily.

By the way good questions.

Jim Rogers