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| Author | Post | ||
| jacknastyface2 |
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 Registered Member #5239 Joined: Sat Apr 21 2018, 05:29pmPosts: 553 | Hi Nikolay, How thick are the bulkheads and do you have the poplar thickness planed for you? Perhaps I have asked before? Keith. | ||
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| Roshtainsky |
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 Registered Member #5044 Joined: Sun Nov 26 2017, 02:06amPosts: 53 | Charles, Thank you for the kind words. From what I have seen, your builds are no less detailed and are of very high quality! Arthur, I used some scrap to apply a more scientific method to answering the question. I pinned one of the samples yesterday, and will record the experiment as best I can. If I figure out how, I'll even upload it to YouTube to share. Keith, The poplar is nominally 1/4" thick for the bulkheads. The back bone of keel, and Stern post started out as 1/2". And the stem is down to 1/4" as well. This kind of stock is reasonably available in our local Home Depot around Toronto. It is carried as hobby board, and is available in several thicknesses, and a small selection of widths and lengths | ||
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| Roshtainsky |
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| Registered Member #5044 Joined: Sun Nov 26 2017, 02:06amPosts: 53 | Gents, Regarding the discussion of pinning joints, it appears that I had gone to extra trouble for little reward. My test results show that the pinned joint failed prior to the unpinned joint. Setup: Both joints were done using scrap offcuts of 1/4" poplar. Both were glued using Titebond III and left to dry for over 24 hours, at which point the #2 article was drilled, the bamboo dowel dipped in glue (same as above) and inserted. The article was left to dry for over 24 hours again. Both articles were drilled with a 9/16" hole to accommodate the pulling hook. Procedure: Each article was clamped to a dowel peg, hooked with a luggage scale and subjected to an in-line pull using a rope bridle. Results: The unpinned joint failed just shy of 20 lbs. The pinned joint failed around 12.5 lbs. Possible contributing factors:
see the following links: Test #1 - unpinned Test #2 - pinned see pictures for results:     | ||
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| jacknastyface2 |
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| Registered Member #5239 Joined: Sat Apr 21 2018, 05:29pmPosts: 553 | Nikolay, You are taking this seriously! Nice to see though. Some of your joints are end grain to long grain I believe. Have you tried an end grain to end grain joint?. I have done it occasionally, but I have applied the glue onto the two ends, then let the glue absorb a little. Waited a few minutes, then applied more glue---then clamped for six hours. It works/ca marche! I did not test it however. Keith. | ||
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| Roshtainsky |
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| Registered Member #5044 Joined: Sun Nov 26 2017, 02:06amPosts: 53 | Thanks Keith. In the end I was just as curious. It is a lot of work to (as much as possible) accurately drill and pin the joints. | ||
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| Roshtainsky |
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| Registered Member #5044 Joined: Sun Nov 26 2017, 02:06amPosts: 53 | So now that I am back to cutting out bulkheads and dry fitting them into the backbone, I'm finding it challenging to line them up correctly - how do you ensure that they are at the correct height? And is it best to block them with spacers to ensure uniform spacing? Or is it better to use a batten at the waterline to do both - spacing and vertical alignment? | ||
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| jacknastyface2 |
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| Registered Member #5239 Joined: Sat Apr 21 2018, 05:29pmPosts: 553 | Nikolay, When I look at your build log, page 1, I saw your work table and you had a photo of H.Underhill's book there . Does it not show you how to hold the keel, stem, sternpost and also how to cut a template to hold either frames or bulkheads in their correct order and keep them vertical? Keith. [ Edited Tue Oct 01 2019, 02:11am ] | ||
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| Roshtainsky |
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| Registered Member #5044 Joined: Sun Nov 26 2017, 02:06amPosts: 53 | Hi Keith, It indeed shows a method that addresses the issue of uniform spacing and to a certain degree athwartship alignment. However, it does not address the issue of height - I think Underhill relied more on having adequate construction drawing information as well as meticulously accurate parts. | ||
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| jacknastyface2 |
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| Registered Member #5239 Joined: Sat Apr 21 2018, 05:29pmPosts: 553 | Nikolay, I tried doing a POB schooner a few years ago and I was not very proud of it. It is still downstairs "on the stocks". May I show you a few pictures of the early construction? It is the New Bedford fishing schooner Ernestina. It is made much like what you have done on TOL. I don't want to detract from your build log, but it would be something to discuss. Give me a yea or a nay. It could be deleted after a chat. Keith. | ||
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| Roshtainsky |
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| Registered Member #5044 Joined: Sun Nov 26 2017, 02:06amPosts: 53 | I welcome the offer Keith, I do not think it will detract from the log. On the contrary, a healthy discussion may lead to a wealth of ideas | ||
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