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Post subject:Layout for Boat Building
 Posted: Jul 03, 2004 - 02:42 AM #1311
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Power User
Joined: Feb 01, 2004
Posts: 820
Location: Mobile, Alabama
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| I have finally desided on a design for my first sheet metal boat project. I was thinking that triangulation would be the best was to layout the pattern for the hull. I want to start the layout drawing in the morning and could use some help. I am a bit rusty and could use some help getting started. Here is a rough drawing of the initial shape of the boat. I don't think this drawing shows the curvature that it will have on the sides of the sides of the boat and I will post a more descriptive drawing in the morning. You will need to use your imagination on some of this. Please, if there are any question or suggestions feel free. |
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Post subject:RE: Layout for Boat Building
Posted: Jul 03, 2004 - 03:44 AM #1312
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By the looks of the top paln and the side plan the sides are already shown in true length? Triangulation wouldn't be necessary for this If there is any pitch to the sides, it 's not shown in the drawing, either you need some more line work or another view as to show the pitch from the top of the boat to the base?
Nice work so far... |
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Post subject:RE: Layout for Boat Building
Posted: Jul 03, 2004 - 03:53 AM #1313
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Joined: Feb 01, 2004
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Location: Mobile, Alabama
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| There will be pitch in the top of the sides. i am working on a new drawing showing the curve in the top. The curve will be very slight. I am thinking I can build the 12' boat from one sheet for the bottom, I will ct the nessisary length from a coil. I have to work around the limitations of my brake, 10'. I thought , in this design, that the edges of the strait sides at the bottom could be pitts. and the sides have a 1/4 on them, I know if the top of the sides were curved, the pattern will need to layed out for the change in length on the top(Longer) will need o be figured, triangulation seems like he way to go. More later........ |
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Post subject:RE: Layout for Boat Building
Posted: Jul 03, 2004 - 02:19 PM #1319
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Joined: Feb 01, 2004
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Location: Mobile, Alabama
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| Rough hand drawing. May give a better idea. More and better later. |
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Post subject:RE: Layout for Boat Building
Posted: Jul 03, 2004 - 02:48 PM #1321
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Location: Mobile, Alabama
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| What would be the best way for me to draw and explain the sheet metal boat, in relation to the sheet metal layout information, so that anyone could build the craft with minimal problems. An example of someone elses thoughts on this process would be good for me to see right now. |
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Post subject:RE: Layout for Boat Building
Posted: Jul 03, 2004 - 02:56 PM #1322
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Three Views, Top / End (from the hull side) and front...then you can work on the true lengths from the end view for the sides. If the boat is flat on top, you can get your true lengths from there for all the sides?
I'm in the middle of a drawing on a "Bath Tub for Kids" and I'm actually going to build it..I'll try to squeeze in some time and draw up something for you.. (if you don't get to it first) |
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Post subject:RE: Layout for Boat Building
Posted: Jul 03, 2004 - 03:03 PM #1323
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Bud wrote:
Three Views, Top / End (from the hull side) and front...then you can work on the true lengths from the end view for the sides. If the boat is flat on top, you can get your true lengths from there for all the sides?
I'm in the middle of a drawing on a "Bath Tub for Kids" and I'm actually going to build it..I'll try to squeeze in some time and draw up something for you.. (if you don't get to it first) Thank you, Intrested in seeing that bath tub. I am working on the drawing but would still like to see yours so I can learn more. I will put those practices into motion. Thanks |
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Post subject:RE: Layout for Boat Building
Posted: Jul 04, 2004 - 02:26 AM #1327
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| Whats the next step in this drawing? Would I use projection to give the fore and aft views or end views? Then I could use this drawing to establish a workable pattern? Sorry, I have resized this twice and no luck. |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 01:24 PM #1384
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| Back to this again. I have been working both end against the middle. The flat layout I posted in "How would you layout this pattern?" ,have to converge at some point. Any ideas on the layout process would be helpful. |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 03:07 PM #1385
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Lets do this with a straight line to the tip of the hull and work from there to curved hulls. This is important to understand this to move on to the next. It'll get you to scratch your head a bit, but it will strengthen your skill in pattern development.
Putting a curve into this as you would need for the hull, think about if parallel line would work for this and what you need to develop a pattern using parallel line? |
Last edited by Bud on Jul 11, 2004 - 03:09 PM; edited 1 time in total
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 03:08 PM #1386
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How do you find the true length of 1 to 2 in the pattern?
Two views are needed (or at least the information from these views), The top view is ½ of the boat, the #2 representing the hull, the hull is above the water so we need to know by how much is above the water? The side view shows this (a to 2). Draw a true length triangle as shown. To find the true length (one needs to look perpendicular to the plane. From 1 to 2 in the top view, we transfer this length to the base of the true length triangle. This will solve for our true length for 1 to 2 (1 to 2). Draw the pattern as you did with the top and side views. Assuming B to C and D to E are flat, we consider them already true length lines ( A front view of these drawings would answer this and prove right or wrong) the pattern bottom as shown is developed using the same dim. C to B and D to E. B to 1 (D to1) is also shown in True length as they are perpendicular to each other in both top and side views. What is not know is E to 2 and C to 2, draw two lines perpendicular to line CE to extend beyond both 2 and 2, to locate the exact point we need the true length of 1 to 2, from the true length triangle, set your dividers from (2 to 2), using 1 as center in the pattern drawing, strike an arc that intersects with the extended lines previously drawn. This establishes both 2 and 2 in pattern. It too establishes the angle, for there can only be one true angle. |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 03:27 PM #1387
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Here is how you would approach the hull if it were curved (Look at the side view, the curve would be for the bottom and divided into equal spaces, those lines would be projected over to the top view, How many true length lines now are you locating, this where it is important to understand "equidistant" and using it in parallel line development?
Now What? How do I get this to the drawing board? I'll go over it today and post it if you need help with it.  |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 04:50 PM #1388
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Joined: Feb 01, 2004
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Here we go, I will try to explain this the best way I know how. Any comments and suggestions will be appreciated, really. The attached drawing must be viewed in order for this to make sense.
If we had a drawing that showed us three views of a boat, top view, side view and end view, the end view showing the stations of the boat in true length. The right side of the end view would show all of the stations from the center of the boat to the bow. The left side of the end view would show all of the stations from the center line of the boat to the stern.
The biggest question I have at the moment is how to accurately obtain the side view of the boat using the drawing described. I am thinking that triangulation would be used to find out how this side pattern would be developed but I am having what I call, Pattern Makers Block, I can almost get it but not quite. It has been a while since I have put my skills in motion and could use a little help getting started again. I can make an accurate boat drawing, three views and from the other side I can layout the flat pattern as you can see in the photo of the half cardboard model. There is something in the middle that is missing. If the missing part of the layout can be obtained, the possibilities of building the sheet metal boat, well at least the layout, would be unlimited to the possibilities. Seams and frames are another story all together. Once the layout procedures are mastered then we can move forward into the many other aspects of the design and assembly of the sheet metal boat. Dont get me wrong, I can see simple methods for obtaining similar layout, I really want to learn it this way.
The drawing attached in this post will need to be viewed for this part. As you know, you can print the drawing to use as reference for this description. On the drawing you will find line AC, Line AC, the true length, would be obtained from the three view boat drawing. Establishing this line would be the first step in the flat pattern layout. Curve 1 can then be established having known the radius of the arc, the center of that arc can be established by projecting from each end of the line, an arc using dividers set at the distance of the radius. Once this point is established, the arc, curve 1 on the drawing, can then be established. Once line AC and curve 1 are established, I would find the offset for the bow from the three view boat drawing. The line I have established, though not marked or indicated on the drawing attached, the line that represents the chine of the boat will need to be established. From his chine reference line and using the offsets gotten from the three view boat drawing, one of the projections needed to form point B will can be established. Using point A as center and the length of line AC, point B can be established.
Now that line AB is established, Curve (2) can be drawn in the same manner as Curve (1). Additional parts can now be added to the layout. Establishing the curves seemed to me to be the basis for every thing else, all other layout processes would be secondary but must be accounted for in establishing the starting points for the primary layout. I have shown Aux. Curve 3 to point out that curve 2, when point B is moved in closer to the centerline, would maintain its integrity to still fit with Curve 1. I hope this makes some kind of sense. Any feed back would be appreciated, I just wanted everyone to see where my understanding was on this process, saves us time
Thank You |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 05:07 PM #1389
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| Bud, Not rushing anything, just threw this one out so evryone could gather there thoughts, we can get back to this another day when other projects are completed. Now back to sustained thinking. |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 07:16 PM #1390
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I'll stick with the "Simple Flat Bottom" boat and the hull in different designs...The one you just described is more them likely pressed...all depends on the side to hull transition. There is only so much one can do before the pattern is to irregular and becomes distorted?Maybe at most this can ce done in long strips 8 inches wide (about) and layered, riveted, etc. I do have that instruction I can and will put in the library...
Bud |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 09:08 PM #1391
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| Flat bottom, better drawing of something similar maybe tonight. Here is a picture that may help . |
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Post subject:RE: Layout for Boat Building
Posted: Jul 11, 2004 - 09:11 PM #1392
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Location: Mobile, Alabama
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| I know this is confusing when I show you different desgns and styles. The reason is to test the layout. Bear with me, its not the product its the process. I will get back to my boat soon. |
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