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Type: Posts; User: MN Dave

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    Re: Timber framing tools

    If you make the lathe, you will need to forge some more tools for it:
    5888
    5890
    Pics taken 5 years ago at the North House wooden boat show in Grand Marais.
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    Re: Timber framing tools

    If Bealer's blacksmithing book is a well written as Old Ways of Working Wood...
    This book tells you how to use the tools. Any book will tell you that you pound a froe to split wood, but this book...
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    Re: Measuring small amounts of epoxy?

    The little medicine cups they use for wine tasting at the local liquor store present a sometimes pleasant way to obtain small mixing containers. Sometimes, because as Brendan Fraser described Number...
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    Re: Inflatable Outriggers

    Perhaps the solution here is to graduate from the blimp to the dirigible, or as we prefer to call them here, SOF? There is no reason not to completely close the deck of a SOF and install an air...
  5. Re: Reliable/bombproof centreboard pin construction. Graphalloy-bronze?

    After describing some of the options, I looked for an example online and found this https://www.mcmaster.com/#plastic-sleeve-bearings/=1a98awd Pick a material and look at the load rating for the same...
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    Re: Acetone or Lacquer Thinner?

    If you aren't a frequent flyer, you will have a lot more trouble with boogered pumps. If the pumps sit for a month or two the epoxy can get poxy and removing the solidified crud without trashing the...
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    Re: Measuring small amounts of epoxy?

    Yes the nut is the tare. There are detailed instructions in the link I put above the picture. http://www.duckworksmagazine.com/05/articles/scale/


    Good advice. You have some good tips on handling...
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    Re: Measuring small amounts of epoxy?

    Uff-da! Much as I like a 60ml syringe, they are hard to fill, a pain to reinsert the plunger without making a mess and you can't stand them up.

    For those of us who would rather work for hours to...
  9. Thread: Samilling

    by MN Dave
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    Re: Samilling

    Yes, look out for fatigue cracks.
    I did a little digging and it looks like large band saw blades are generally made from Udelholm 15N20 and is popular with knife makers.
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    Re: laminating wood

    You used PL 375, not Premium.
    Watch this video, they tried both:
    PL premium and immersion: https://www.youtube.com/watch?v=IY7hkCexNVY skip to 4:20 for the adhesive test.
  11. Thread: Samilling

    by MN Dave
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    Re: Samilling

    There is a good size steam powered mill in Oregon.
    http://www.hulloakes.com/products.html

    https://vimeo.com/55482452
    EDIT #2 https://youtu.be/cF_BR1Cf-9c
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    Re: laminating wood

    My point with respect to trunnels was that the wood used to make them is stronger and much more rot resistant than your typical dowel. Pinning a joint with a rot and corrosion resistant material...
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    Re: bending 1-inch stainless tubing

    You would think that you could find some decent pictures or videos to illustrate the hydroforming process used on musical instruments. There are plenty of sites that say it is done, but very little...
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    Re: laminating wood

    At the risk of being accused of dowel play, while we eschew dowels we extol the virtues of trunnels. Trunnels are generally made of hard, rot resistant woods like black locust and osage orange....
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    Re: home made sander belts

    Google fu <sanding belt splice tape>

    Procedures for Processing Butt-Type Coated Abrasives Splices

    Mylar is polyester. It makes for a tough, stiff tape.
    http://www.adktapes.com/coated.html
    ...
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    Re: bending 1-inch stainless tubing

    There is a good pun in there somewhere about the instrument builders having perfect pitch, thus making it easier to work with.

    What I did read was that they melted the pitch, rosin, or mixture in...
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    Re: bending 1-inch stainless tubing

    I tried to lookup something about using rosin powder and found some old references to filling tubes with molten pitch or a mix of pitch and rosin. Some used just rosin. Springs, table salt and frozen...
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    Re: bending 1-inch stainless tubing

    If you plan to weld the tubing or bend it with heat, use the low carbon grades. 304L or 316L. The heat can cause the stainless to corrode.

    A steel mandrel will leave bits of steel embedded in...
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    Re: 3M curing question!

    Yup. Shoulda explained it more plainly.

    'swhat Bruce said. Only he said it better. I did mention that you will pro'ly need to warm it up a little.

    Well, it all depends on the user. I was...
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    Re: 3M curing question!

    It does say that the epoxy will cure at 35°F. It is going to set up a lot stiffer, and less flexible than the PU, neither of which is a problem in a good joint. The adhesive/sealant is a lot easier...
  21. Thread: Welding Wood

    by MN Dave
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    Re: Welding Wood

    That would be called a butt weld.
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    Re: 3M curing question!

    LYS? Oh, Lumberyard Skiff. Well, the WB link says they use Sikaflex and 3M 5200 is pretty darned close to the same thing.

    There are two things from organic chemistry to worry about that I recall,...
  23. Thread: Welding Wood

    by MN Dave
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    Welding Wood

    This is interesting, if not all that practical for boat buiding.
    Wood can be welded.

    The process was discovered by accident.
    "To “weld” wood, pieces of lumber are pressed together (at 60 – 330...
  24. Re: Two rescued after drifting for 5 months in the Pacific. ... I don't get it????

    Was that Kiribati or Kiritimati?

    Which boat are we looking for? https://www.marinetraffic.com/en/ais/home/centerx:144.7/centery:-21.5/zoom:3
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    Re: Theremo-electric energy recovery

    I'm not be an expert on the advisability of connecting Peltier devices in series. I am more comfortable with heat transfer. Pete is absolutely right about aluminum vs copper as the heat sink material...
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    Re: Traditional SOF technique (no epoxy)

    Tightening varnish is another name for aircraft dope, nitrocellulose lacquer.

    There is some history and a lot of good information on fabric aircraft coverings here:...
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    Re: Theremo-electric energy recovery

    Boston,

    My expertise in this area is at the level where the elbow and posterior are difficult to differentiate. I tried to conform that my suggestion was feasible when I realized that I had posted...
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    Re: supplier for bronze angle?

    385 architectural bronze is really a variant of free machining brass.

    385 brass and 655 silicon bronze are galvanicly compatible, but brass shouldn't be immersed in seawater. The potential...
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    Re: Theremo-electric energy recovery

    You are describing an OTEC power generation system https://www.makai.com/ocean-thermal-energy-conversion/
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    Re: Rust removal from stainless

    Thanks, Gib.

    Passivation is the removal of any stray bits of steel or similar contamination from the surface of the stainless. Any cutting or grinding will leave embedded particles that will...
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    Re: Theremo-electric energy recovery

    There are different temperature range materials for thermoelectric generators according to the link on my earlier post. You may need to match the chips to the heat source. I don't know much about the...
  32. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    You mentioned sealing and rivets popping.

    The rivets on the Titanic may have failed because they were cold. Steel and iron that is very tough at room temperature can become brittle near 0°C and...
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    Re: Rust removal from stainless

    Parkerizing, a phosphate coating will probably be removed by anything that will remove rust.

    As Kevin said, the stainless is probably heavily pitted, and nothing short of grinding out the pits...
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    Re: Theremo-electric energy recovery

    It sounds like you are looking at a thermoelectric generator, not a thermopile. The Powerpot appears to have a thermoelectric generator. With any luck, the keywords will help in a Google search....
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    Re: Hatch that Doesn't Need to be Opened Often

    There is a sealing tape that forms a flat gasket between fairly smooth surfaces that might allow you to design a seal with next to no dead space to collect water. It is tacky, but the hatch will be...
  36. Re: Confessing corrosion confusion... bobstay fittings.

    Will you seal the line with some 3M 4200 or similar?

    I got thinking about the leverage that adds up to the rather large loads that the bobstay is subjected to. If I am not mistaken (again), the...
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    Re: An Iceboat, with wing-sail maybe?

    Wingsails on iceboats:
    https://www.youtube.com/watch?v=qltwydZHmX0
    DN plans: http://na.idniyra.org/about/specifications/
    General wingsail information:...
  38. Thread: Pool noodles

    by MN Dave
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    Re: Pool noodles

    It's all pricey. Do the math on the noodles.
    Walmart 2.5" with 1" hollow, 5 each, 52" gives you 0.62 cubic feet for $15.28 comes to $24 per cubic foot.
    The 3 pack of solid 2.5" x 60" comes to...
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    Re: Duplicating Dagger Board in Wood?

    Dave (Woxbox) has a very practical answer. If there is enough slop in the slot, you could glass the daggerboard to reinforce it some. You will thicken it by at least 1/64 inch per layer of 6-10 oz...
  40. Re: Wood - Plywood - Epoxy bond, re-building my ketch Tonga

    Take care of that shoulder! You have my sympathy. This concludes the useful portion of this post.

    I haven't commented in a while since there isn't much that Nick and company haven't covered. I...
  41. Re: What type of boats are the "Disneyland Jungle Cruise" boats?

    There were two models sold over the years, one by Atwood Steamcraft and one by Master Modelers. Both look like the original design before the wheels were added. But, yes, a good design for use on...
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    Re: Compass vs Electric auxiliary?

    It is possible to shield the compass from the magnetic fields coming from the motor and cables with low carbon steel sheet, which is basically fairly pure iron. I'm pretty sure hot rolled will do...
  43. Thread: Pool noodles

    by MN Dave
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    Re: Pool noodles

    Forget noodles. Poor shape for packing. Sheet is easier to use to fill volumes.

    Having said that, cylinders (noodles) go for ~$21/cubic foot here: EDIT $44 oops.:mad:...
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    Re: Grumman Sportboat

    Cleco? What? Oh... http://www.panamericantool.com/cleco-fasteners.html Cool. Found a sheet metal tool list while looking up Clecos.

    Nice work. Looks like you scuffed the metal around the patch so...
  45. Re: Confessing corrosion confusion... bobstay fittings.

    I have to agree with Ian that saving weight with a composite fitting is pointless. Fabricating a composite part is well within the capabilities of most of us, although understanding the load paths...
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    Re: wood for spreaders

    What Jay means by saying flexible is that for a given stiffness, the high strength allows ash to bend more before it breaks. Since the design is probably more stiffness driven than strength driven...
  47. Re: Confessing corrosion confusion... bobstay fittings.

    Interesting discussion. I am good with metals and corrosion, but bobstays are not my bailiwick. What I have read is that the loads on them are incredible.

    I have to agree with Bruce. I like the...
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    Poll: Re: Designing a new CONCRETE BOAT

    It will float in calm water with a 200 kg load and 2cm of freeboard. As long as the load is very careful not to rock the boat and there is no wind and no waves, it may stay afloat. I have two canoes,...
  49. Thread: Pool noodles

    by MN Dave
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    Re: Pool noodles

    Solid core are still available. 3 for $15. Since you don't intend to swamp for extended periods, I would buy the less expensive hollow core noodles, cut one up and use it to plug the holes in the...
  50. Thread: Osage & Epoxy

    by MN Dave
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    Re: Osage & Epoxy

    As Thorne and Paul said, there are a lot of epoxies and not all epoxies are the same. I would add System 3 G-2 to the list of epoxies for difficult to bond woods. ...
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