Re: [CAD_CAM_EDM_DRO] Buying or CNCing some odd angle bevel gears. I'm

Why do they have to be symetrical? One gear could be 45 deg. as long as the
other non-45 deg. gear matched up to it at the proper angle.

Bill

On Sat Jan 12 18:22:07 2002, hllrsr@..., <hllrsr@...> wrote:

>Tom,
>Which model of the Merlin are you building?
>The reason I ask, is I am building a simplified 1/4 scale.
>In the research I've done, the bevel gears are 45 deg. driven by an
>idler off the crank, which also gives the reduction.
>
>This is how thw sectioned R&R at the museum in Hamilton is done.
>Could the difference be Packard-vs-Rolls, or the Mark #?
>
>Iain
>Barrie Ontario
>
>
>kaynrc wrote:
>>
>> Hi guys. I was going to just ask where I might find some 22.5 degree
>> bevel gears, so that the shafts would intersect at 45 degrees, not
>> the usual 90. I would by FAR prefer to buy them, but, this is a Cad-
>> Cam group, so I'll also ask what you'd do if they can't be found. IE:
>> Make them with a 3 or 4 axis cnc mill?
>>
>> Here's the application: I'm doing a little 1/4 scale Merlin, and
>> there's a vertical shaft in the back of the engine, in the wheelcase
>> to be exact, and this drives a few items. The top of this shaft has a
>> gear which drives 2 other gears on the end of their own shafts. These
>> second shafts travel up to the rear end of the cylinder heads to
>> drive the camshafts.
>>
>> If that sounds confusing I'll paint the simplest picture possible.
>> The bottom shaft is like the bottom of a letter "Y" and the upper
>> shafts, like the top part of a "y", are driven by it. The gears, of
>> course, are in the middle of this acting as "glue" between the 3
>> shafts. The top two shafts seem to be 90 degrees to each other, so 45
>> degrees to the vertical driving shaft.

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