This log saw is built to the plans in super model leaflet 23. There is another log saw super model leaflet (number 10), naturally this model is not the same as that one!
This model is very easy to construct and it runs well; especially after a minute amount of oil is applied to the sliding parts (saw frame & the two support axles and the pair of worm gears). The model was constructed in less than one evening (with lots of interruptions).
When the drive pulley is rotated, either by hand or by some form of motor, the saw blades (rack strips) oscillate up and down and two of the wood feed rollers (pairs of flanged wheels) rotate forcing the timber onto the cutting blades and carrying the cut planks away.
I had to modify the model by replacing the 25 tooth pinions with 38 tooth gears on the drive to the rollers. I could not get the pinions to even come close to meshing with the worm gears. The larger gears fit well once the axle supports are jiggled a little.
First off, is an overall picture of the saw from the front side. The blue pulley at the back left corner is where power is applied.
Next, is a view from the opposite side to the previous one. The worm drives to the rollers are easily visible and the drive to the saw blades can also be seen.
Finally, is a view from below the saw, showing the mechanism quite well.
This table contains a listing of the parts I needed to build the model. The parts listing in the original super model leaflet, while mostly accurate, is somewhat flawed in places.
|2||2||Perforated Strip 11 hole||31||2||Gear 38 teeth|
|2a||2||Perforated Strip 9 hole||32||2||Worm Gear|
|3||2||Perforated Strip 7 hole||37a||61||Square Nut|
|6||1||Perforated Strip 4 hole||37b||61||Bolt|
|8||4||Angle Girder 25 hole||37c||8||Hexagonal Nut|
|8a||2||Angle Girder 19 hole||38||1||Washer|
|12||8||Angle Bracket 1x1 hole||48b||4||Double Angle Strip 7x1 hole|
|12a||2||Angle Bracket 2x2 hole||53||2||Flanged Plate 7x5x1 hole|
|13a||2||Axle 200mm||72||2||Flat Plate 5x5 hole|
|15a||5||Axle 115mm||77||10||Triangular Plate 2x2 hole|
|16||2||Axle 90mm||94||1||Sprocket Chain (290mm)|
|20||8||Flanged Wheel 28mm diameter||96||2||Sprocket 18 teeth|
|20a||1||Pulley 50mm diameter||108||2||Corner Gusset|
|24||2||Bush Wheel 8 hole||110||2||Rack Strip 7 hole|
|26||1||Pinion 19 teeth||115||2||Threaded Pin 15mm|
|27a||1||Gear 57 teeth||147b||2||Slotted Pivot Bolt 16mm|
|30||2||Bevel Gear 26 teeth|
Meccano Models Page| Pauli's Meccano Page