Composite Boatbuilding 2

Setting Up the Frames

For the posting with bigger photos, follow the link below.
http://yate.tistory.com/entry/Composite-Boatbuilding-2

1.Setting Cross Spalls

Cross spall is the part which holds each frame on the Strongback(Cleat?) and coincides with each station lines on the floor. To set up the cross spalls, we need to decide some conditions as below.

* We're setting
- numbered face of each frames heading backward(astern).
- Frames before station line for STN.0 to STN.12(Widest Beam)
- Frames after station line for STN.13 to STN.15

To set the cross spall, station line must be marked on the Strongback(Cleat?) but station line is marked on the floor. So we need to transfer those lines into Strongback with accuracy. Photo below shows how we transfer the line vertically.

  

With two square rules lined with station line on the floor and a Straight Edge, you can transfer station line from the floor to Strongback.

For STN.0 to STN.3, we used whole piece for cross spall, but after that, cut the timber to small pieces to save plank(I guess) (Photo below)

  

Also, we used glue(PVA) and screw altogether to set up the cross spalls firmly.

 

While we were fixing the cross spalls, we used straight edge again to make it quite accurate, but later some of the the cross spall has been slightly moved and we fixed it.(Photo above)


2.Setting up STN.0 and STN.1 Frames.

In setting up the frames, most important thing is level(vertically and horizontally). For level, we are going to use device called "Dumpy Level".

But to use Dumpy Level, it must fixed onto somewhere with clear view of target and no one cna easily move it.

After we set its position, we made three wood blocks with a 10mm hole in which spike of tripod fitted then glued it onto floor with some weight on it. So, another 24 hours to use it,

So, for th STN.0 and STN.1, we used conventional way, level, level and level!!!

And before we start it, we also made jig for 15 degree wedge and wedges using the jig.
PHOTO INSERT Here!!!!!

STN.0

We set the frame onto STN.0 spall and made its center line is on the Centre Line of the boat. Then, we placed a level on top of the frame and wedges on each side. By pulling and pushing the wedges, we set the horizontal level. Once horizontally leveld, then, we fixed the frame onto the cross spall using screw driver. Then, we pulled out those two wedges and glued them. Then, put them bakc uder the frames and snap off the rest of wedges. So, now it's horizontally leveld.

  

Then, we need a long piece of brace to hold vertical level position. The brace must be fixed onto floor or somewhere.
With brace attached to the frame, using another level vertically we set its vertical level. When it's leveld, we fixed the brace with some weights.(We didn't have any glued block on the floor for the use)

  


So, now STN.0 is vertically and horizontally levled.

STN.1

Since Chine is also Water Line, Chines of all frames must be at the same level and we are using this to set the STN.1

This time we need three leves, two metal rules and two wedges.

Set the STN.1 on the station line and Center Line must be matched. Then, clamp one metal rule horizontally right on the Chine line of the STN.1 and another metal rule on the STN.0 exactly the same.

Then place a level on top STN.1 and two more levels on each side of metal rules in the crossing way to another.

Using wedges, try to find a position where all the bubbles in three levels are in center.

Once it's done, fixing process is the same.
- Fix the frame with screw driver onto the cross spall
- Pull out the wedges and make'em glued. Put them back and snap off the rest of wedge



The rest of Frames with Dumpy Level.

How to use Dumpy Level.
First we need to level the device. The one we used has three knobs to adjust its own level.
When it's leveled, aim a target on which we could mark comparison level then mark the comparison line on the traget.
So the observer gives directions on where to mark. The reason why we mark the comparison line is when the Dumpy Level has been moved by accident, we need to set the same level again. For this reason, comparison line must be marked on somewhere easily not moved.

Leveling using Dumpy Level


Then, we need to get two long sticks called "Story Rod". We clamp it to each side of frames right above of Chine.(To be matched on Chine).  Then we mark the same level on the stick as comparison line. Since the Chine on all the frames are at the same level, a distance from Chine to marked line of Story Rod in one frame must be same as in other frames too.

So we are using this to level all the other frames.

  
1.Mark the comparison line on masking tape using Dumpy Level(Left)
2.Clamping Story Rod to the frame(Right)
3.Mark the same level line on the Story Rod(Center)

When you look into the scope, you see the marked line is a bit higher than level. So observer gives direction to lower the frames a bit.

  
While we are leveling and setting up the frames, it must be stay leveled. So we attached temporary brace on top of frames and it will be replaced with stronger brace.
1.Temporary brace is placed on top of frames(Left)
2.Cutting out beveled shape for stronger brace for later use.(Center & Right)


  

Differnt shapes of cut off for brace - Straight Brace(Rectangular) and Angled Brace(Beveled)


  

Temporary braces were replaced with stronger braces. Straight brace and diagonal brace were attached to the frames and also to the floor with glued block.

So all the frames and braces are completed.