Anonymous-0
Well-known Member
Im just trying to fine tune this old mill, the saw blade has been hammered for 900 rpms, so does that mean I should set it under load or without a load ??
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chevytaHOE5674
Well-known Member
900 RPM's is pretty fast. But usually a saw is hammered for a certain RPM with a load on it. Turn the motor up so that it comes down to your hammered speed under load so that the saw stands straight up, too slow and the blade can tend to walk around.
Always wanting to learn. What does it mean to have a saw "hammered" for a certain RPM? Also, what are the liabilities/problems if you run it at a different RPM? Would the same considerations apply to a smaller diameter blade like a skil saw or a chop saw? I presume you are talking about blades at least a couple of feet in diameter.
TIA- Dave
TIA- Dave
Except in the case of swing mills, blades are typically 40--60 inches or more in diameter. They're hammered (streched) to make them 'standup' i.e. be flat, while in the log. Running at the wrong rpm can make them run hot, which will lead to being concave/convex instead of perfectly flat. Hammering is just that; beating the blade with a hammer.........by someone skilled at doing so. There are some great sawmill/logging forums on the net.
armand tatro
Well-known Member
Are you a member of the Forestry Forum? Lots of information on lots of forestery topics. Maby some of your neighbors on there? Armand
chevytaHOE5674
Well-known Member
All depends on the blade... A blade hammered for 900rpm would most likely cut terrible lumber at 600rpm.
Richard G.
Well-known Member
Been sawing for 35 years. I would never run a blade at 900 RPM. Have it hammered for 500 to 600 and have adequate power to pull it.
My saw runs about 450 rpm and it does fine.
Two schools of thought on blade speed. One is run fast and I have never been able to understand why.
The other is run slower with lots of power which is what I do.
If something goes wrong, which will be the case some day, I prefer things to be running slower.
Also the number and spacing of teeth is important. For hardwood you want a saw with wide spaced teeth. Too many teeth in the log at one time eats up power and can heat the blade. I could go on and on but will stop for now.
Richard
My saw runs about 450 rpm and it does fine.
Two schools of thought on blade speed. One is run fast and I have never been able to understand why.
The other is run slower with lots of power which is what I do.
If something goes wrong, which will be the case some day, I prefer things to be running slower.
Also the number and spacing of teeth is important. For hardwood you want a saw with wide spaced teeth. Too many teeth in the log at one time eats up power and can heat the blade. I could go on and on but will stop for now.
Richard
Tim Barnes
Member
A little knowledge can be dangerous but I'm going to offer what lil' I have. My mill was a lot older than Lyles' so this might not apply. We had a 00 model Frick with a 60" blade. We always ran it at 550 rpms, powered by a 100hp electric motor. This is kinda OT..We cracked the blade once due to sawing a walnut that came out of someones yard. We found another blade at a sawmill junkyard in Western NC. They wanted $400.00 for the blade, $450.00 if we wanted it hammered to set up for 550 rpms. It was interesting to watch the saw Dr. work on the blade, all he used was a straight edge, a piece of chalk and a hammer. Lyle, are you having problems with your mill sawing straight...just wondering?
Anonymous-0
Well-known Member
Thanx guys for all the info, I think Im staring to move ahead on this project. I will be making sawdust before long...Lyle 
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