Chapter 2: Frames
Well..., with anticipations to start, we are moving to the next chapter of our build log - assemble the Frames or Ribs how they described in the instruction manual. if you recall, the kit's manual suggested assembling the frames before the berth. However, as most of us, who are building this Alert kit, we build the berth first, and this is no error. Both are two independent processes and can be started in any order. IMHO, as the first time POF builder, I feel a bit comfortable building the berth, first. Anyway, let's move on.
I think, it worth to mention\learn some nautical terminology related to the frame construction as we will use them quite often in this building log. Below are images from the book by Peter Goodwin - The Naval Cutter Alert 1777 ( areally nice companion to our kit build). Take a look at what parts the frames are consists.
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Please note: the images are for educational purposes. The first image is the disposition of the midship timbers. It is isometric and gives a great idea of how the frames were laid. Be familiar with the terminology. It is a nice way to learn, IMHO
The second image is showing frames construction. Take a close look (both B4/6 and B4/7), each of those showed two types of frames (you will find when assembling frames in our kit). The first frame (top) B4/6 attached to the rising wood using both: 'cross chock' and 'first futtock', where 'first futtock' are two pieces (left and right). Both futtocks attached to 'cross chock' using bolts. However, the second frame (below image) attached to the rising wood using 'floor timber'. Pretty interesting ...ha? Get confused yet??? Both: 'first futtock' and 'second futtock' connected using the 'chock' (or anchor piece). There should be only one 'chock' connection (left and right side on the frame). The last piece of the frame is the 'lengthening piece', it is always connected with 'second futtock' using 'plain scarph'.
The reason I want you to be familiar with the frames disposition is in the kit, we will have to assemble the frames the same way. Pretty cool...I am very excited.
Words to be familiar with. Check both images on top.
- Toptimber (top part of the frame)
- Chock or anchor piece (joined futtocks)
- First futtock\Second futtock (parts of the frame)
- Cross chock (attached to rising wood)
- Floor timber (attached to rising wood)
- Plain scarph (joined futtocks with lengthening piece)
- Lengthening piece
Back to kit frames (ribs). In the instruction manual, Trident Studio divided all the frames into five types:
- Single frame (made from a single piece). They don't require any assembly. However, they need to be shaped using paper\MDF board templates. The frames are AL-1 to AL6.
- Type 2 frames consist of 2 pieces. They will be assembled using the 'plain scarph' joint. Template jigs made from MDF and labeled for each frame. Some of them will also require shaping (bevel), and for those types of frames, you will use the same jig. The laser-cut will give you an indication of the beveled line.
- Type 3 frames consist of three pieces. they will be assembled using the 'chock'. Some of them required beveling as well. Check the MDF template to identify the number corresponding to the frame.
- Type 4 and Type 5 consists of 7 pieces. Connection made using 'chocks' between 'futtocks' and 'plain scarphs' between 'futtocks and 'lengthening pieces'. The difference between type 4 and type 5 how they will be attached to the rising wood. Type 4 will use 'floor timber' and type 5 will use 'cross chock'.
I have already mentioned that assembling frames made simplify by using MDF templates (jig). Each frame has its own laser-cut template. When working with templates, DO NOT throw the centerpiece. It suites as a template when the frame indicated for beveling. Here are some photos of the kit frames.
Example of the single frame and paper templates. Actually, this is the frame AL1 (the first one)
This is the frame AL1 shaped according to templates and shaded area
Some other single frames (Type 1)
Type 2, consists of 2 pieces joined by 'plain scarph'
Type 3. Parts are joined using 'chock or anchor piece.
'chock' joints, we will use them a lot down the road...
Type 4 and 5 frames. The majority of the frames will be of those styles. Two of those types tightened together with bolts will make a double-frame. Alet has 10 double-frames. Will talk about those later...
Breakdown pieces by their names.
to be continued... stay tuned.