I am in the planning stage of building a sawmill enabling me to cut stumps up to about 710mm(28") in diameter so this is what I have in mind;
4 post steel frame, 30mm(1.18") shafting with pillo block bearings, 450mm(18") plywood wheels bolted to 8mm flange welded to 30mm shaft. Wheel center to center 117cm(46") depending on standard size blades available, I think about 148" to 150" blade, not sure about standard blade size yet. I have a 4 stroke petrol engine from a Ryobi RG-6900K generator with a rated output of 5,5KW and 6,9KW max output. Not sure if that refers to the generator or the engine.
Now my questions; 1) What is the ideal blade FPM speed on these mills. 2) Will a bicycle tube work as wheel tyre on the drive wheel and is it necessary for a wheel tyre on the other wheel. 2) I need some help on a simple wheel tensioner system, the drive wheel will be fixed so the other wheel will have to do all the adjusting and tensioning. 3) Blade info like width and TPI.
This mill will only be used to do the occasional slabbing of tree stumps, mainly hard woods, so speed is not very important as it is not a heavy production operation. The average tree stump is about 25 to 40 cm(10"-15") dry hardwood. Any info about the Ryobi engine will help, I assume the motor speed is 3600rpm but could not find anything on Google. I plan on using a 60mm(2.36") double belt pulley on the motor, the drive pulley will also be from plywood attached to the drive wheel.
Any help and suggestions will be appreciated.
Koos du Preez