Minnie TE Long term project

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Pete W.:

--- Quote from: Stilldrillin on October 09, 2013, 02:06:16 AM ---I've never had to build a gear assembly. But.........

I've often wondered how they were spaced accurately to each other. As, once the hole is drilled, nothing can be adjusted. :scratch:

Nicely shown/ explained Joe! :clap: :clap: :thumbup:

David D

--- End quote ---

One way I was taught is to turn a pair of disks whose ODs are precisely equal to the pitch circle diameters of the two gears concerned and whose centre holes are precisely concentric with their ODs. Clamp them to the gear-case plate(s) with their ODs in contact (but see below) and with their centres aligned with their desired positions as accurately as possible, then either spot through the centre holes onto the gear-case plates or centre under the mill by clocking the centre holes. It helps if the disks are not too thin. If there are more than two gears in the train, repeat as required.

To avoid over-meshing if the gears are up on tolerance, the gear manufacturers often quote a backlash figure - one way to implement that is to interpose a suitable bit of feeler stock between the disks.

The method above is not quite the same thing as using tool-makers' buttons. I haven't looked but I'm sure that method (i.e. TMBs) is well described on the web and in reference books.

Joe d:
Pete: Thanks for that, always good to learn alternative methods.

JasonB pointed out to me that there was an easy solution to my milling mishap:
Stuck both of the bearings on a little stub of appropriately sized rod, and milled them down together until the offending
divots were gone. Maybe eventually it would have occurred to me that this was an entirely arbitrary dimension...

got them all in place now, with some random bits of rod to check for fit & relation to each other, and a notch in the hornplate to simplify crankshaft insertion/removal

Going to go quiet for a short time, heading out of town for a week.

Cheers, Joe

Its Me:
Joe, Interesting build, you good 2, I have a dividing head and the gear cutters building the courage to try it, guess I am going to end up with a half gear tooth or possible even worse, will follow the build, Its Me.

Joe d:
Well, it hadn't seemed like so long.... :hammer:

:update:

after a number of things getting in the way I'm finally back to the Minnie.

When I left off, I had concluded that the hornplates just wouldn't do, so
have now made up a new set with holes where they are meant to be
and not so many where they shouldn't

and from the other side:

and the Driver's view:

the gears mesh reasonably well, the shafts turn well enough that a little running in will sort them,
so now I'm ready to move along.

Cheers, Joe

Stilldrillin:
Well (re) done Joe! :clap: :clap:

It's good to see you're back to it, again........ :thumbup:

David D

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