G: Gearbox (Twin) Double Backlash

[vibrac]

For the Landsdowne twin racer.
I see the archives suggest that the alternate dogs should be 'chipped' off with an anvil a punch and a big hammer!
Really?
I was thinking more of an air grinder (which is what I did in the apprentice school in 1960-godknows)
but thats not entirely safe as things slip and speak to the adjacent tooth.
Has anyone still alive on here done it and how?

 

[bmetcalf]

With a surface grinder with a narrow wheel?

Edit: Cancel that, I was thinking of something else.

 

[Bill Thomas]

Yes a grindstone, But because the shape of the stone, It went a bit up the gear,
I didn't fancy the chisel either !!.

 

[timetraveller]

Yes Tim. still alive and able to remember doing it about 1960. I did try the flaking method but just decided that it was too brutal for me and the gear. Instead I used small grind stones and a hand held drill. It would be much easier these days with a Dremel or similar but you are right, One needs to be very careful not to slip and mark anything else. I used the grind stone on both types of dog, inners and outers.

 

[vibrac]

Back then I think one of the weeklies ran some articles on what to do I certainly remember reading about making a norton clutch fit the Vincent before my first race from that source. No one around to ask and no internet until I joined the VOC and went to the Oxford section that was full of racers.
I have a big V twin compressor but even so I guess it will be grind, wait, grind and there are a lot of teeth to do....

 

[BigEd]

Has anyone got a photograph of the gears with the alternate dogs removed?

 

[timetraveller]

Yes, I did the Norton clutch job as well.

 

[Bill Thomas]

Me too, Much better for FAST gear change,
But not good from getting gear at standstill,
Maybe would be better with the Spares Company lever,
But mine was too heavy , Would be even more heavy with the lever mod,
Now back to standard !, Because of Bad hands !!, Much better,
Makes me laugh with the modern bikes going Clunk into first,
They should have it sorted by now ????,
Any new bikes right yet ?.

 

[timetraveller]

Is this photograph any use? Sorry about the focus. Note that the other set of dogs that this set have to mesh with also have to have every other one removed.

 

[Bill Thomas]

Looks like you used the same grind wheel as me Norman !,
Hard not to nick a bit off the tooth.
Good job we aren't Dentists .