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Author Topic: IM F Units - decoder / light board screw size  (Read 819 times)

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RBrodzinsky

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IM F Units - decoder / light board screw size
« on: April 24, 2020, 08:13:46 PM »
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Does anyone happen to know the screw (thread) size which hold the light board / decoder in place for N scale IM F units? I am just curious as to whether I have a proper tap for them (when relocating during a LokSound install) for power pickup. Typically, I’ve ended up using an 00-90, since I have a lot of those on hand, but hate tapping holes that small.
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Rick Brodzinsky
Chief Engineer - JACALAR Railroad
Silicon Valley FreeMo-N

RBrodzinsky

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Re: IM F Units - decoder / light board screw size
« Reply #1 on: April 25, 2020, 03:41:37 PM »
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To answer my own question, and for anyone else who might need to know, they use M2 screws.  This morning I made a little thread tester: took a piece of PCB and drilled/tapped holes for 00-90, 0-80, 1-72 and 2-56 screws. Then opened up a unit, took out one of the screws, and it didn’t fit any of holes. Hmmm, then realized I had some Kato M2 screws, so took one, and it threaded right into the IM.

Have now ordered an M2 tap to have on hand as well.
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Rick Brodzinsky
Chief Engineer - JACALAR Railroad
Silicon Valley FreeMo-N

Cajonpassfan

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Re: IM F Units - decoder / light board screw size
« Reply #2 on: April 25, 2020, 03:47:33 PM »
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I like a man who can answer his own questions.. :D
Otto
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