REFLECTOR: Gearbox alignment

[Jim Sower]

<... How would you measure the axial and radial run-out  of the input 
shaft ...>
I would try a dial indicator.

<... in order to  relocate the mount and improve the alignment ...>
I would explore the possibility that the gearbox is offset from the 
engine output shaft.  You have some sort of bell housing that mounts to 
the engine and to which the gearbox is mounted.  If the gearbox case is 
wrong, the input shaft of the gearbox will be offset from the output 
shaft of the engine.  That might cause the problem(s) you have.  I can't 
speculate further without more facts.

How big is the hole the bushing is in?  Could it be replaced by a 
bearing race ... Jim S.

Wayne wrote:

> Hi,
> Are there any motorhead/ machinist among the group who have ideas 
> about aligning my Marcotte  reduction drive  to the Soob in N33SV? I 
> have had this "thrumming" vibration  since day one aand attributed it 
> to the flexible coupling/flywheel arrangement. I recently converted 
> the drive to a solid coupling with heavier flywheel similiar in 
> concept  to Eggenfeller's approach.  I machined a snug fitting bronze 
> bushing to replace the pilot bearing in the flywheel and it brought to 
> light  the mis-alignment of the reduction input shaft from the end of 
> the crankshaft. *It wallowed out in about 10 hours.* 
> How would you measure the axial and radial run-out  of the input shaft 
> in order to  relocate the mount and improve the alignment?
> Dealing again with Marcotte is not high on my list.
> Since most glass grinders arent interested in this stuff if you prefer 
> to respond off reflector my e-mail address is:wowens at darientel.net 
> <mailto:wowens at darientel.net>
> Thanks,
> Wayne Owens