09-03-2012, 11:38 AM
Still fighting the noise. I gave up on the source of the noise, the drive. But I intensify my efforts to make the shell as heavy and stable as possible to be no resonator like a drum. The weight is under long hood and got an extra plumb. The glue is intentionally fixing the sides of the hood to the weight too. Two small weights are under the roof cab and the cab is fixed glued to the shell.
The fifth shell has been modified yesterday and it helped.
Another point is the way how the shell is fixed to the drive. Two screws in the center but the shell should also "touch" the drive at the front and rear. I have to check that and make sure the front and/or rear of the shell are not free swinging.
Those of you with larger layouts where a little switcher might have to run longer distances at higher speed should be careful not to stress the drive to much due to the additional weight. The 70 ton drive is very sensitive because a brass worm works on a plastic tooth wheel with a lot of play. That is a perfect milling machine!
![[Image: file-9.jpg?t=1346693242]](http://i966.photobucket.com/albums/ae149/faraway52/Misc-1/file-9.jpg?t=1346693242)
The fifth shell has been modified yesterday and it helped.
Another point is the way how the shell is fixed to the drive. Two screws in the center but the shell should also "touch" the drive at the front and rear. I have to check that and make sure the front and/or rear of the shell are not free swinging.
Those of you with larger layouts where a little switcher might have to run longer distances at higher speed should be careful not to stress the drive to much due to the additional weight. The 70 ton drive is very sensitive because a brass worm works on a plastic tooth wheel with a lot of play. That is a perfect milling machine!
Reinhard