Flywheel

To eliminate the "bump" from the eccentric, Henk Lambregts installed the following flywheel assembly into his Castlewood.

"The flywheel is mounted on a lose shaft, supported by the straps. One strap is mounted by glue and a screw to the wall of the pressure box, the other is floating on the main crankshaft and fixed by a collar and set screw to the lose shaft, thus making sure the lose shaft for the flywheel is parallel to the crankshaft.

Measurements are not critical, but depend on the size of the flywheel, O-ring (as drivebelt) and lose shaft.

The pully on the main shaft and the one fixed to the flywheel are needed to let the flywheel turn at a higher rotation than the main shaft, thus improving the flywheel working. Again nothing is critical as long as the rotation is easy and everything fits in the organ.

The flywheel is made by turning a wheel out of steel 100 x 100 x 20mm. In the flywheel I made a recess for a roller bearing as used in rollerskates (which are sold cheaply). I attached by brass soldering a shaft with an other holder for the rollerbearing on the back of the flywheel. An O-ring is used to run from the pully on the main shaft to the flywheel axle making the flywheel turn about four times the speed of the main shaft.

The keep the flywheel in place two strips of 20 x 3mm steel are made up with holes to pass over the main shaft on one end and to hold a 8mm shaft for the flywheel bearings. The shaft is brass soldered to the rear strip. This rear strip in turn is attached to the pressurebox with double-sided automotive tape, 2 brass screws M3 from the inside of the pressure box to threaded holes in the strip and a small woodscrew on the other side of the main shaft. All this to make a stable axle for the flywheel. The second strip is placed over the axle after putting the flywheel in place. This "floating" stip is fixed to the 8mm shaft with a soldered on collar. The floating stip makes sure the axle of the flywheel stays parallel to the main shaft. On the main shaft the stip is held in place by two collars with extra washers to make the movement easy.

Due to a miscalculation on the holes I drilled in the pressure box - I needed to grind down the lid of the bellows for clearance.