TNT Build, ... With Tons of Pictures

Outboard designs up to 14'

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Bill CNC
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Location: Hesperia Ca, 92345

Re: TNT Build

Post by Bill CNC » Mon Oct 15, 2012 11:23 pm

Crutch has been built, stem and frames strung, keels laid and the chine logs are being pre-bent for a couple of days before gluing.

Just in case your wondering where the hydro is, ... Look up! :mrgreen:

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Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Mon Oct 15, 2012 11:30 pm

I made a couple of jigs to simplify making the scarf joints for the chine logs and sheer clamps.

The 1st picture is the router box jig and the 2nd picture is the gluing jig, ... 2 at a time. :wink:

Basically I unbolt the two halves and apply a fine mist of 3M77 spray adhesive. Wait a few seconds then I lay wax paper on each half.

Works like a champ.

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Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Tue Oct 16, 2012 12:14 pm

Now on to the hard work, ...

The Turn Fin

The turn fin is the sand casting that Glen-L sells. As with all sand castings, they LL require a bit of work, ... well if it's going on my boat it does. :wink: I want to polish the fin to a nice highly polished aluminum look, so first I need to find out what stays, and what goes.

The first thing I needed to do was grind and sand the sand castings rough finish so I can see what I have here. The first thing I noticed was the fin was not square by 5 degrees so that was the first thing needing work.

After finding out the lowest corner, I mounted the fin in a vise on the mill and cut the bottom square in relation to the fin. As seen in the vice, The top right corner was low. So if the top right corner is 0.0", ... the front right was .040", the front left was .055" and the top left was .071" high. Now, ... she's dead 0.0" at all four corners. I then drilled the (8) screw holes drilled at 7 degrees to the outsides. I did this for several reasons, 1). To get clearance for the drill chuck. 2). It will be a whole lot harder to rip the fin off without the keel going with it. :mrgreen: The way the fin is mounted, it creates vibration when cutting so I used the automatic feed on setting 1, which a snail is faster. The machining on the bottom too just under 2 hours so it wouldn't chatter. I kept an eye on it while doing my regular job.

Another issue was the tip of the fin looked to be bent somehow. The pictures reflect that showing a space between the steel rule and the fin. This will work in my favor because the fins edges are way to fat. just shy of a 1/4". This is to be expected with sand castings. It's much easier to get a good casting if the part is thick. Besides, ... I will be shaping the edges thinner for less drag. Nothing like a fin, ... pushing water, ... :shock:

The fin work is going to take a while, so I will keep posting the work on it as I progress. I'm mainly doing it at lunchtime at work.

Here are a few pictures;

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Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Wed Oct 17, 2012 1:15 pm

Just about cleaned up. The fin edges need a little more work. Almost there. :)

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Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Fri Oct 19, 2012 2:26 pm

More work on the fin. It has been shaped, thinned and sharpened. I did a test polish on the back of one side, ... needs more wet&dry sanding before the polishing. I also cut 45* angles on all four sides of the base. I will pot the front and back ends to the hull so I can remove and replace it if there is ever an issue such as hitting something with the fin.

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Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Bill CNC
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TNT gurus needed

Post by Bill CNC » Sun Oct 21, 2012 12:05 pm

Ok, ... I must be in the ether or something, ... but I cannot seem to get the chine logs to fit correctly. I have tried EVERYTHING under the sun and then some. Twisting, bending, forcing cursing and finally raising the white flag.

The problem is at the stem. I can lay them on perfectly on the frame members with no troubles, but at the stem, the angles don't measure up. I used the jig with a notch cut out to achieve the proper set back. But when I do that, ... the chine is set in to far and will require shimming it out in order to fair it in.

I have been trying to get this done for 10 freaking hours. :evil: I'm at the point of not giving a crap and just setting them and shimming it with a 4x4 if I have to, or, ... plan B, ... toss a match to it! :shock:

Here are a couple of pictures. I cut into the stem to the half way point to simulate it being fared in and you can see just how sunken in the chine is.

The chine wants to naturally flow straight into the bresthook but somehow I think this is creating the problem. If the chine was located farther from the bresthook it should work, but the chine will not bend away from the bresthook.

WTH???

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Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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vupilot
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Re: TNT Build

Post by vupilot » Sun Oct 21, 2012 5:29 pm

Are your starting from the stem and bending back toward the transom? If not try that.

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Sun Oct 21, 2012 6:24 pm

vupilot wrote:Are your starting from the stem and bending back toward the transom? If not try that.
vupilot,

I tried everything.

Front to back, ... back to front and from the middle out. It didn't change a thing. :?

The Book, ... "Boatbuilding with Plywood", towards the end of the page 133, it says: "In many cases, the position of the chine logs on the stem can be varied up or down along the stem for a considerable distance." I cannot move it anywhere but were it wants to land. The book goes on further and says: "Do not attempt to force the chine logs into a curve that they will not naturally assume."

If the jig notes I'm at the correct setback, it should be good. My chine is flexed all the way around the boat correctly, but yet I'm under the natural line I need to be at. I dont think I am betting enough curvature of the chine between the stem and frame #3. My chine i pretty stiff, yet I don't think I'm anywhere near fracturing it, so it is pliable enough to do this correctly. So far I have killed the whole weekend trying to get this correct.

I think at this point I should just look into cutting a pair of shims. Seems it will be faster at this point. :roll:
Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Roberta
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Re: TNT Build

Post by Roberta » Mon Oct 22, 2012 4:57 am

I started my chines at the stem and bent them back towards the transom. I supported the chines on the first frame aft of the stem, cut the angle, then clamped them in place. I needed to steam the bend of the chine between the stem and the first frame in order to get the bend and twist necessary to properly meet the stem and frames. The note suggests that you use to wood's natural bending tendencies, but it will often be necessary to bend and twist the chines. I tried to match the natural bends and flex of the chines to match the direction they needed to go so they mirrored each other. After steaming, I secured the chines in place for several days with clamps. This made permanently installing them much easier. Chines can be difficult. Steaming and sometimes laminating two thinner pieces is necessary.

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Roberta :D
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Mon Oct 22, 2012 10:25 am

Thanks Roberta,

The chines bent naturally just fine. It wasn't even a problem giving them a twist. But trying to raise the chine from the breastplate, ... that just wasn't going to happen. Doing so made the chine logs come out of the notches on frames #2-3 and then it would give me issues at the transom. Raising them only made frame #1 happy. Doing it the way I did, ... everyplace was happy but the breasthook and frame #1, .. go figure. The frames voted 3-2. So on they went! :mrgreen:

I will probably need to shim it some between the stem and frame #3, ... but oh well, ... :roll:

They are glued on now, ... onto the sheer clamps. :wink:

Pics are just before the glue.

OH, ... to top it off, ... while gluing on the other chine log, ... my building form came loose from the floor. I was leaning on it to get frame #1 into position and the concrete nails let go, ... &$#@!(^

After it was all glued and screwed, ... I leveled everything perfectly before turning the lights off at 2am. I'll have to use the ram set tonight and get her anchored back down.

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Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Mon Oct 22, 2012 5:01 pm

Ok, ... I finished up the fin. 6 hours later, ... here she is.

Image
Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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jprice
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Re: TNT Build

Post by jprice » Tue Oct 23, 2012 7:49 am

WOW! That came out really nice! :D

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Bill CNC
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Re: TNT Build

Post by Bill CNC » Tue Oct 23, 2012 10:03 am

jprice wrote:WOW! That came out really nice! :D
Thanks Jeff, ... it was a bit of elbow grease, ... :wink:
Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Bill CNC
Posts: 394
Joined: Mon Apr 02, 2012 11:44 am
Location: Hesperia Ca, 92345

Re: TNT Build

Post by Bill CNC » Tue Oct 23, 2012 10:07 am

When I got home from work, ... the first thing I needed to do was to get the building form in place again. A ram-set was used and an additional 3 nails were added.

The first set of sheer clamps have been glued on. I took a straight edge to the sheer clamp and the chine log, ... and I will be needing shims almost .375 thick, but we where expecting that. Boy, it's a bit of a pain getting these sheer clamps and chine logs on all by myself in the tight space I have. :shock:

Image
Bill

TNT Build, ... On Going, ... http://tinyurl.com/abmae64

The Freebie Zip, ... On Going, ...http://tinyurl.com/at3udss

Super Spartan Build "Miss Tripindicular", ... Completed, ...http://tinyurl.com/b488wsz

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Roberta
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Re: TNT Build

Post by Roberta » Tue Oct 23, 2012 2:40 pm

Look's good, Bill!!

Roberta :D :D :D
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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