Re: Encoder mounting

The Marshall-Nordec supercharger drive on my '52 uses this type of
coupler. I've come across quite a few working on vintage cars. Often
the coupling disk is leather--obviously not a good choice for this
application. It does seem that with the right choice of coupling
material wind-up could be more or less eliminated.



--- In CAD_CAM_EDM_DRO@egroups.com, "Heuver, Brad (B.R.)"
<bheuver@f...> wrote:

> I looked a bit further at the encoder mounting on the P&W last
> night. The coupling used looks to be a bit easier for the HSM to

fabricate

> than some described here, the helical coupler, in particular.
> There is a standard solid coupling on each end, one on the

shaft of

> the ball screw, one on the encoder. In between the two is a one

inch square

> piece of brass shim stock that looked to be about 0.005" thick or

so. The

> square of brass was fixed to one coupler by two rivets on opposite

corners

> of the square. The other two corners were fixed, in the same

manner, to the

> other coupler. The rivets themselves gave the square a slight

standoff from

> the couplers, about 1/8". This space would allow the axis of the

two shafts

> to be off a bit, which will result in the flexing of the brass

square shim

> stock in the axial plane, while still being very stiff to rotation.
> After seeing it, I remembered seeing many of these in the

past, some

> with multiple stacked squares, each fixed to the opposite corners

of the one

> next to it. The stack, obviously, to take a greater misalignment

than a

> single square. I think that this style mount may be the best

(easiest to

> make) for the HSM on this list.
>
> Brad Heuver