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Country Discussion Topics
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Homemade Timber Saw
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Spence    Posted 01-10-2002 at 16:48:45       [Reply]  [No Email]
I'd like to make a homemade frame saw the old pioneers had way back. Except mine would be used to cut planks from logs.

The old frame saws was a section of saw stretched in a frame and was used mainly like a bandsaw and the blade was thin also. The frame was supported between 2 vertical members.
The top of the frame had a cord that stretched upward to a hickory bow. The saw was worked by a paddle that was tied to the bottom of the frame like in a sewing machine fashion. This is a smaller idea of course.

Now mine. I'd use the side PTO from my tractor that I would drop to another pulley system to give me 40 or so RPM from the original 720 (I think). My frame would be 2 vertical peices of 4in channel
spaced 4ft apart, and the ends would be in a huge cement block (I dont want the thing to move)
below frost. The top would have a double beam welded across with the same material. I would make a frame out of something that would make a tight fit between the 2 channels. The blade would be a 6in wide piece of continuous rip bandsaw that i'm sure I can get as they are thrown out after several sharpenings at the mill. I'd cut a 3ft or so piece and have it stretched in the frame.

The frame would be powered from the bottom with a homemade piston rod and wheel sort of fashion with a built in rubber or spring shock absorber at the top of the frame. This will buffer the top stroke a little. The plate would have a
shear pin just in case. Don't want to fubar the PTO.

Instead of the top spring in the center of the said frame, I would experiment with car coil spring or whatever is available even motor mount to buffer the lashing that I think will happen at top of stroke.

Haven't mulled over the details yet but basically the log bed would go thru the frame somehow and I'd have to rig a cog system (more pulleys) to feed the log on the down stroke (usually 3/4in from the demo I saw at a old mill).

There would be minimum wear because everything after the last pulley is working in slow motion. It would require a lot of grease between the frame and vertical member. A seizure here would break the rod. The saw would still have acceptable kerf for slow motion and the edge would last longer. You could even substitue and old 7Ft pit saw somehow which already has the bowed edge eliminating the 3/4in feed. You could even push the log or run some cord system to do the work.

It would be kinda slow of course and I could probably go to break while a plank is being cut, but what the heck.

What do you think.


tlak    Posted 01-17-2002 at 05:20:30       [Reply]  [Send Email]

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Lew    Posted 01-11-2002 at 20:03:37       [Reply]  [Send Email]
Spence, most auto rear ends are in the area of 3 or 4 to one rather than 10 to one. At a NE Iowa show I have seen something like you mention. It was run from the pto but it was used to cross cut not rip.


goinnutts    Posted 01-10-2002 at 22:22:30       [Reply]  [No Email]
so this sounds like a giant scroll saw???, why not just go the whole route and make a stationary bandsaw? seems like there would be lees chance of breakage and binding.I do believe your going to have to figure a way to keep the saw from binding as it feeds , I think your gonna have a lot of slap and wobble, but I hope not good luck with yur project ,these things need to be tried.And also another question when ya say "side pto" are you rferring to a belt pulley ?


Spence    Posted 01-11-2002 at 05:25:56       [Reply]  [No Email]
Belt pulley that's right. I replaced my flat belt to a 10in iron 2 groove V belt.

Burrhead had a great idea on the feed, simply downhill the log into the blade. A stationary bandsaw would be bringing me back to the high tech screaming high speed arrangements like chain saw mills and such. Thats why I like the old water powered saw mills, the slow pace and little supervision. (I saw plans for a bandsaw using 2
13in tires. It's in an issue of Mother Earth circa
1976)

I had another 2 problems I didn't think of in all this. The connection to the bottom of the frame should not be in the center of it, but oriented under the 2 slides on each side. That should eliminate side binding which I feel is the greatest potential for breakage. Also the channels would have to be true channels, as the standard
variety uses a half round cove on the inside and the flanges are tapered slightly. Might have to build my own instead.

Feed binding I don't think is a problem, the strokes would have a lot of power due to the ratio drop, even then I can also provide for an axle shaft for a flywheel if I need it. I have a baler flywheel of 250 lbs I can use. Also the weight of the frame on the upstroke would be considerable and the stroke instant which would be interesting to watch on the first trial. Perhaps a buffer compression spring would be required here.

An issue in Cloudburst regarding how to make an overshot electric power plant gave me the idea of using an auto differential with one axle lock- welded to give me the first step down from approx 10 to 1 ratio (i think). Tractor pulley to pinion, then output to wheel. A very strong arrangement and more direct. After that it would take only one pulley to get my final speed. I would also use a V belt idler pulley as a clutch.



rhudson Cloudburst?    Posted 01-15-2002 at 23:11:59       [Reply]  [Send Email]
Can you tell me more about cloudburst? is it a alternative energy magazine?


goinnutts    Posted 01-11-2002 at 22:12:18       [Reply]  [No Email]
sounds like ya got yur ducks in a row ,, good luck with it i also saw a picture or article on a saw operated with 2 car tires used for??? I ould not quite figure out how it worked from the photos.. maybe the bandsaw ran on the wheels??? but shoot ,cant remember for the life of me where zi saw it maybe on here recently?? good luck with your invention, I have so many ideas but the thing is IO never go through with any of them, this plan of yours sounds worked out , and I did not realize until a reread that you were looking for a slow feed set up.


Les...fortunate    Posted 01-10-2002 at 18:32:01       [Reply]  [No Email]
If I was you, I'd go visit an old water powered up and down mill. Don't know if they have any such of a thing in a working museum near where you are. The nearest one I know of to me is at King's Landing near Fredericton, New Brunswick but there's probably others.


Burrhead    Posted 01-10-2002 at 17:59:31       [Reply]  [No Email]
Put yer log on a down hill roller carriage and let it feed as it goes along at it's own pace.

I can't picture it in my mind how to lift the saw blade for the backstroke unless you use some sort of offset camber.

That's what being tied to the hickory limb did on the old ones. It not only returned the saw blade but it also lifted the teeth off the cut.


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