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Minolta greases, etc

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Phil Wood View Drop Down
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Topic: Minolta greases, etc
    Posted: 06 June 2021 at 16:48
I stupidly took the helicoid from a 50/1.7 apart a few months back (best advice - don't do this) - after much fiddling I got it back together, only to find I the lens won't focus to infinity. I guess I didn't get it right!

So I am about to have a go at doing it properly. Looking at the service manual I see specs for lubricants G-10, G-30, G-40 and G-70 as well as a thread lock B-40.

Does anyone know what each of these is or, even better, point me towards readily available alternatives. I'm not hugely fussed about getting a perfect match, after all I was in the lens because something Minolta used ended up on the iris blades. Modern equivalents are, hopefully, more stable.
 



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MichelvA View Drop Down
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Post Options Post Options   Quote MichelvA Quote  Post ReplyReply Direct Link To This Post Posted: 06 June 2021 at 17:58
I know something about greases, but unfortunately not the types used in photographic gear. I do know thread locks can work very different, so be careful with using something else. Some thread locks make it almost impossible to use the thread again, some are gentle and allow the bolts to go out easily.
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Phil Wood View Drop Down
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Joined: 24 March 2013
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Location: England
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Post Options Post Options   Quote Phil Wood Quote  Post ReplyReply Direct Link To This Post Posted: 06 June 2021 at 21:49
G-10 is on the helicoid thread, so I'd guess it is fairly thin. G-70 is on the AF drive cog, which is usually pretty gunky - so a thickish grease. From there I'd guess at the numbers being graded by thickness (viscosity?).

I'll watch out for thread lock, which must be pretty mild to work on tiny screws which are easy enough to unscrew after 30 years.
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