The wheels are lowered with a simple cam and there is no need for a lock because in the down position the cam is past center and it stays down on it's own.
I attached a PDF which should make the drawing easier to read if you print it out.
The wheels are lowered with a simple cam and there is no need for a lock because in the down position the cam is past center and it stays down on it's own.
I attached a PDF which should make the drawing easier to read if you print it out.
Have you had time to check your PMs yet? Carl
I tend to forget all about checking for private messages. But I have replied back to you now.
Nice work, and thanks for the layout drawing. I may be doing much the same myself soon, but there is one thing I wonder about. Why do the laminated build up? It seems perhaps they were original to the boats, but I always thought laminated tillers were a bit inferior in appearance to solid shaped. It looks like the pattern could be got out of 5-1/2" stock with just a band saw and then shaped up. I have seen a few herreshoff tillers that were really lovely. Plenty strong enough in the right wood, I imagine.
Just a question, not a critique, it looks really lovely.
-Frank
Perhaps laminated tillers are inferior in appearance. This is why I plan to make a second tiller out of all mahogany which will look more like one made from solid stock.
But the laminated tiller is significantly stronger than one made from solid stock. The grain pattern of the individual strips follows the shape of the tiller which by itself adds strength. Think of wood like a bundle of plastic straws. If the straws are running close to perpendicular to the length of the tiller it is easier to break the tiller in between the straws separating the bundle. But if all of the straws are running the entire length of the tiller it is much more difficult to break it because now you have to actually break the bundle of straws in half and not just separate them from the other straws. Does that make sense or have I had too many beers tonight???
The reason I used the white ash in this tiller is because white ash resists bending and twisting much better than mahogany. So by mixing the two I get the strength of the white ash and the appearance of the mahogany all in one.
But as I said earlier I plan to make another spare tiller (which might become the primary tiller) out of all mahogany. And while I believe it will be strong enough to handle the forces applied to it I learned long ago that I am not able to over come the urge to over build everything I make. I know that if I build it stronger than it needs to be then I don't have to worry about it anymore.
Last edited by Commander 147; 02-25-2010 at 06:27 PM. Reason: Copied from a Word doc and formatting needed changing
JERRY CARPENTER - C147
A man can succeed at almost anything for which he has unlimited enthusiam.
Jerry's 2"X2" diagram of the tiller layout in post #64 also works to show what would happen if you laid out the tiller on a nice plank of mahogany - or any wood.
It's easy to see the short grain in the tapering of the tiller to its end. Just follow the horizontal grid lines through the slender handle. That's short grain.
Easy to imagine it cracking there the first time you leaned on the tiller by mistake.
And there is too much runout in the grain where it approaches the tiller head.
Same result, and compounded by the side loads a tiller takes in use.
It would be dangerous at the end of the tiller where you have 3 closely grouped bolts holding the tiller onto the bronze tiller head - if there was any slanted grain there.
You could have a solid NON laminated tiller if you took your pattern out to where a locust tree had fallen - and tried the pattern on various limbs, then
cut your tiller out of that single curved piece of wood. They used to carve out floors and knees for wooden ships by chopping out curved pieces of tree crooks, crotches, limbs coming out of trunks, roots, and such. Curved limbs for frames.
Seem to remember the term "grown knees".
So if you found the perfect limb and carved out the tiller - you'd have a grown tiller, by gum.
And if you had the right wood (Honey Locust would be good) it would definitely be stronger than a laminated job which is only as strong as its glue.
Last edited by ebb; 02-25-2010 at 08:43 PM.
I think the shape is perfect. I like how the handle end droops down so it becomes level when installed.
You probably wont find a stock tiller shaped like that. Usually the handle end points up. Not terrible, but it could be better. The drawing is helpful, and H & L could build one based on that for the non-carpenters here
The worst is a tiller that is too low. Not only do you bang your knee, you end up having to lean over while steering. Becomes uncomfortable
Nice job
Posting Permissions
Reply With Quote