buzzsaw question

Mr Mom · May 06, 2009, 11:43:12 AM

How fast does the blade have to spin??
Need help with pullies size.
all info would be helpful on anything to do with a buzzsaw.

Thanks Alot Mr Mom

Ed · May 06, 2009, 11:51:13 AM

My cordwood saw is on a 9n Ford, the belt is run off the factory mule drive setup. IIRC, the saw pulley & drive pulley are the same size.
It has a 30" blade and I usually set the throttle at 3/4.

Ed

Wallys World · May 06, 2009, 09:22:28 PM

I have been told (don't remember where) for a 30 inch blade you want 1200 rpm.

Mr Mom · May 06, 2009, 09:29:41 PM

thanks guys 8) 8).
My blade is a little over 20"

Thanks Alot Mr Mom

rpg52 · May 09, 2009, 08:08:24 PM

Years ago the one we had was connected to the tractor pto, so it was ~540 or so. It would seem to depend on the diameter though - larger slower, smaller faster. Rim speed would be the determinant I would think. Within the parameters, then the horsepower would be relevant.

I would be interested too, I might have to change my pulleys if they aren't close. Here is an irrelevant but related issue - at one time, before I owned it, mine was run by a '61 Mercury Comet, the owner jacked up one wheel until it was in contact with the flywheel, and set the throttle to run at 55 mph. How to convert that, I wouldn't know.
Ray

Mr Mom · May 10, 2009, 09:54:15 PM

The guy i bought it off of dad had it hooked to three phase and they just put some pullieson it.
He said that when his dad started the motor he took a 4x4 and it cut it a little to fast.
After he and his dad talked it over his dad said that he would slow it down a bit.
The weather has been not good so i have not been able to work on saw.

Thanks Alot Mr Mom

John Woodworth · May 17, 2009, 11:34:28 PM

The one we had ran off a 8 horse Briggs, it had a 30" or so blade and handeled it fine.

Mr Mom · May 18, 2009, 08:59:36 AM

Thanks Alot John i was thinking about a 8 or 10 hp motor.
but i think that i can get away with a smaller motor sence mine is 10 inches smaller.
I will try a 5 or 6 first and if that will not work i have 13 hp that will.

Thanks Alot Mr Mom

rpg52 · May 20, 2009, 08:30:46 PM

So, did anyone confirm the 1200 rpm for a 30" saw that Wally's World thought? My 9 hp engine was said to have been used for a buzz saw, but I haven't yet tried it.
Ray

Mr Mom · May 21, 2009, 07:47:17 AM

I think that using a buzzsaw is a dieing art.
I am going to start at 540 that seem to be a good place.
I think that starting with the same speed of a tractors pto is a place to start.
That does the pto of a ford eightend spin at??
Does anybody know??

Thanks Alot Mr Mom

Fla._Deadheader · May 21, 2009, 08:56:54 AM

First thing, what size is your pulley on the saw mandrel ???

My dad hooked up a hit and miss 4HP New Holland on the saw rig I had for cutting up slabs. They run normally around 500 RPM, give or take a governor adjustment. Mine had a 4" flat pulley, and his engine had an 8" flat pulley if I remember correctly. He just gave the belt a flip over, and he cut slabs to burn in his house for the entire winter, +, we sold several pickup loads, some, twice ;D ;D

All you need on those old rigs is, enough speed and power to get through the wood, without binding or jamming.

Proper SET and sharpening is far more important than blade speed. Know how to sharpen and set that blade ???

Corley5 · May 21, 2009, 08:59:20 AM

An 8N's pto will be at 545 RPMs at an engine speed of 1,500 RPMs

raycon · May 21, 2009, 10:16:29 AM

Here is a link to a list of online manuals for cordwood saws. Scroll down to cordwood saws.
http://www.ntractorclub.com/forums/manuals/manuals_index.htm

I use a dearborn cordwood saw on my 8n. Cuts small rounds pretty well. Sharp blade you don't need to much HP. I've seen some
pretty small electric motors running these. (cutting rounds).
Slabs from the mill severe taper, crooks, etc can bog it down or get uncomfortable when there fat and 8+" wide or so.
I bring theRPMs up on the tractor till the blade stands straight. Sharpening the blade I use a belsaw sharp-all 1055 works well enough. If you can find one at a tractor swap for cheap its worth getting.
Operating least amount of work is if you have someone to grab the cut off and throw it into truck or dump trailer. Not the safest place to be standing. Keep the bushings greased. Only disasters I've heard of locally are the bushing seizing up. Not to sure what the end damage was...

Mr Mom · May 21, 2009, 01:16:29 PM

Talked to a guy on you-tube and he says that his tractor runs about 550rpm at the pully on tractor and the other pully is a little smaller. He guess it turning about 800 to 1100 rpms.
He will get it running and put a tack on it this weekend.
I am thinking that 1200 rpms is a good start.
raycon....thanks for the site will read it later.
Corley5....Thanks for the numbers.
Fla._Deadheader....The pulley size i have not measure it yet. As to sharpen and set have no clue. I will not try it myself but there is some local saw shops that have been around for a long they might know.

Thanks Alot Mr Mom

tractormanNwv · May 21, 2009, 09:43:23 PM

A man that comes to My Antique Tractor and Engine Show has a early 1960's Cub Cadet 100 with 7hp engine and a pto unit on the rear (same as a farmall cub) that is hooked to a 24in? Buzzsaw and it does right well, could use a little more Power but still very functional, Looking Forward to this Years Show....He's bringing a big Frmall M and Hooking it to an Antique Flatbelt Driven Planer, I Think that will be Interesting.

Jim

Sprucegum · May 21, 2009, 10:38:31 PM

I finally found my buzzsaw pics

Its an old continental engine that runs about 1300 rpm, I think. The blade really hums when it gets wound up.

Mr Mom · May 22, 2009, 08:33:50 AM

Thanks Sprucegum that is nice set-up you have there.
I think that i will try 1200 rpms.

Thanks Alot Mr Mom

D._Frederick · May 23, 2009, 11:48:42 PM

I have a 32 inch saw that has a 5 inch pulley on the arbor that I run with a Farmall M. I set the saw speed by listening how loud the saw is whistling, any way throttle is about 1/3 open. I only have a 4 inch flat belt and it slips if saw is fed to fast. I used it a lot to cut cord wood to 16 inch pieces.

You want to make sure that no body but family is helping saw, or you are fair game for the legal system!

Mr Mom · May 24, 2009, 06:54:24 AM

Thanks D._Fredarick...The only person buy the saw is going to be me.

Thanks Alot Mr Mom

maple flats · May 26, 2009, 07:35:33 PM

I think I read some place that the speed of any circular blade should be about 120,000-140,000 outside rim inches per minute. To get this you take your diameter times 3.14 to get the circumferance and devide that into 120,000. If you have a 21" blade you have 21 x 3.14= 65.94". Devide 120,000 by 65.94 you get 1819 rpm, and 140,000 devided by 65.94= 2123. There for such a blade should run between 1819-2123 rpm, design it for 2000 or 2100 rpm and you should be good. A circular blade is not flat at rest, it only flattens and holds a stable plane at design rpm. That is why a blade needs to be retensioned from time to time by hammering to get the proper tension to flatten out at it's design speed.