LumberJocks

Maybe the beginning of a larger project #1: Figuring out angles

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Blog entry by Mark Shymanski posted 392 days ago 941 reads 0 times favorited 9 comments Add to Favorites Watch
no previous part Part 1 of Maybe the beginning of a larger project series Part 2: Cutting the first sheet! »

How’s that for a wishy washy title:-) ?

I’ve been toying with the idea of building myself a small sailboat so the kids and I can putter about and maybe have some fun fishing from it. I am also hoping we can have fun putting it together so I don’t want to get too ambitious right out of the gate.

This weekend I find myself with a bit of time on my hands so I thought I’d experiment with some of the methods folks have described about making a mast. Now before all you folks who actually know what you are doing think I am completely off my rocker by building the mast first I must stress I am NOT building a mast I am just puttering around to see what one of the techniques would result in. It is the first saw dust I’ve made in a long while so it felt good to be back in the shop. ...life has an inexorable way of keeping us out of our shops sometime :-(

Any way this is what resulted:

and from the end….

It turned out surprisingly well considering I just kind of eyeballed the angles. I did try to impart a small taper but my method didn’t give me the result I was hoping for. This prototype did raise a few questions though. Is this type of construction actually strong enough for a mast? I’d been thinking as I did this that I may need to make a laminated core to fit down the middle as additional stiffening. Should I be using ‘triangle’ cross sections instead of just trapezoids? I realized the geometry was simple enough to draw out but that when it came time to actually begin cutting the pieces out that I could not quite wrap my head around how the pieces should be cut without setting up the saw too many times.

Any advice greatly appreciated:-)

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2



9 comments so far

View shipwright's profile

shipwright

4843 posts in 1399 days


#1 posted 392 days ago

Nice try Mark but do a search for bird’s mouth joint. That’s what you want for this sort of job.
They are easily cut on a tablesaw, they self align when assembled and can be tapered if you like.
The only clamp you need is a bungee cord.

All that said, if you mean a small sailboat like a sabot (8’) then your mast would be solid.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View shipwright's profile

shipwright

4843 posts in 1399 days


#2 posted 392 days ago

Here you go. http://www.woodworkstuff.net/EDBirdM.html
This is just the first example I found, there are surely better ones. Disregard what he says about clamping. You just apply glue to all the surfaces and wrap it tight with a bungee. It self-aligns and just gets tighter as you wrap.
Absolutely no reason to use clamps.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View Monte Pittman's profile (online now)

Monte Pittman

13304 posts in 939 days


#3 posted 391 days ago

Lee Valley is where I got my birds mouth bit.

Oddly when I seen your title I was going to recommend contacting shipwright for information.

-- Mother Nature created it, I just assemble it. - It's not ability that we often lack, but the patience to use our ability

View Karson's profile

Karson

34858 posts in 3001 days


#4 posted 391 days ago

I got my bits from MLCS in Philadelphia.

-- I've been blessed with a father who liked to tinker in wood, and a wife who lets me tinker in wood. Southern Delaware karson_morrison@bigfoot.com †

View Ampeater's profile

Ampeater

388 posts in 2348 days


#5 posted 391 days ago

Years ago NORM made a flagpole using the same technique that you have started. See this link.

http://www.newyankee.com/index.php?id=53#!/~/product/id=7916634

-- "A goal without a plan is a wish."

View Napaman's profile

Napaman

5315 posts in 2678 days


#6 posted 391 days ago

Mark…your goals are perfect—-HAVE FUN…

While I know my build(s) are not fine examples——I would highly suggest spending time on the PDR website…people row them, sail and motor them…

Check out:

http://www.pdracer.com/

I especially find the site map page helpful once I have visited the home page:

http://www.pdracer.com/site-map.php

As for me—-I AM OFFICIALLY NAPA-man again…after a tough year we literally just moved back to Napa this week…where I have LOTS of space on my patio for the boats AND a dedicated shop space right next to my patio…I hope to get out and set up my shop this week…

Matt

-- Matt--Proud LJ since 2007

View shipwright's profile

shipwright

4843 posts in 1399 days


#7 posted 391 days ago

The cool thing about birdsmouth joints is that you can cut them on the TS so easily.
1) divide 360 by the number of sides you want.
2) set your TS to that number
3) run one side of the board through twice, first on edge and then flat
I have a couple of tapered 8” diameter walnut columns I my living room that were assembled this way before turning.
The joints are invisible and the walls near the joints are quite thin but the glue joint is rock solid.

-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/

View Mark Shymanski's profile

Mark Shymanski

4987 posts in 2313 days


#8 posted 391 days ago

Thank you very much folks! This is exactly the kind of information that makes LJs such a great website.

Paul the birdsmouth idea was exactly what I was looking for. That it can be cut on the table saw is even better.

I’ve seen those birdsmouth bits in the catalogues, I think I am going to try the tablesaw first.

Your photo James101 really helps interpret the info in tne link Paul provided. Once I get a more reliable net connection I’ll have to check out the other links.

For now I’m going to use the pre-internet way of learning stuff….I am gonna go to the shop and make mistakes:-)

Happy Canada Day!

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View Mark Shymanski's profile

Mark Shymanski

4987 posts in 2313 days


#9 posted 391 days ago

Hey Matt, sorry to hear about the rough patch you and your family have been going through. Hopefully better days are in site now that you are back in Napa. Are you back at the same school?

I have been looking at the Puddle Ducks and I think they are perhaps the least expensive project to start with. I’ve holidays coming up in a couple of weeks and I’ve been debating as to whether I should just work through em or maybe build a boat. Things have been kind a rough on the homefront here and the folks at the office have been pretty sympathetic to my work therapy approach to coping. But maybe I should get out and build a boat instead of burying myself at the office.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

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