Alan's Workbench

[Galteemore]

Silly question Alan but are all the wheels back in the same locations as before painting? That may lie at the root of this 

[Horsetan]

17 minutes ago, Tullygrainey said:

 .... with the final drive grub screw loosened, it runs like a sewing machine in both directions....

Could it possibly be that tightening the grub screw knocks the axle slightly off-centre? If so, it may help to file a flat on the axle section where the grub screw makes contact or drill into the axle so that the grub screw can lock in without pushing the axle out of alignment

[Tullygrainey]

4 minutes ago, Galteemore said:

Silly question Alan but are all the wheels back in the same locations as before painting? That may lie at the root of this 

Not silly at all David. Yes they are. They were painted in situ though I've just now taken them off and re-fitted them.

2 minutes ago, Horsetan said:

Could it possibly be that tightening the grub screw knocks the axle slightly off-centre? If so, it may help to file a flat on the axle section where the grub screw makes contact or drill into the axle so that the grub screw can lock in without pushing the axle out of alignment

That's an interesting thought. Worth a try.

 

I originally spacered the back axle so there was zero sideways movement. I've now taken the spacers out to allow it a bit more freedom. It seems to have improved things a bit. 

[Tullygrainey]

I think it’s been a catalogue of things, among them wheels out of true and a possible bent crankpin. Anyway it’s performing better now so I’m about to tiptoe quietly away for now. 
 

many thanks for the support lads

Edited 8 hours ago by Tullygrainey

[Colonel]

When multiple things the like you've been dealing with of late, it's not hard to doubt yourself!

 There are so many variables in chassis building that I sometimes wonder why we bother. That said, your methodical approach usually pays dividends, while recent issues seem more to do with quality of actual components rather than construction.

 Hopefully, the cause with present itself after time on the shelf...