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Dec 18 - Whilst waiting for Christmas to arrive, so that I can open my 3D printer and get to work, I have been out spending money again. This weeks Instrument is the RPM Gauge. The 6A/1609 is actually from a Wellington Bomber not a Spitfire but is close enough for my purposes and a lot cheaper for not having the word Spitfire attached to the Auction.
Like the ASI it should be an easy conversion to electronics as I only really need the facia and needle - So I will be getting the disc cutter out again. (To reduce the overall weight).
As this is one is not on the blind flying panel, an extra not a basic instrument, I will be setting it aside for next year.
May 19 - Having attacked the DI this morning I thought I would have a go at dismantling this one and it has turned out to be the easiest to take apart and also to convert. This is a later electric instrument and turns out to be slightly smaller than the one's fitted to a Mark 9.
The back cover of the instrument comes off with a few screws that reveal the wire connectors. A couple more screws and the connector block itself can be removed and the cables cut.
The instrument mechanism itself is held in place by the 4 central screws (1 can be seen in each of the slots). The mechanism is removed from the front after you have removed the glass and rubber washer. The glass is held in place by a plain copper wire circlip (without the benefit of the two holes to decompress it) that can be carefully hooked out using a small pointed tool.
Once out the motor can be simply disconnected by pulling (it is connected using a collet) leaving a shaft that can be driven by a new servo motor.
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