    
Westcoastpete
Tinkerer
Username: Westcoastpete
Post Number: 6
Registered: 06-2013
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, September 10, 2013 - 01:15 pm: | 
|
Hi All
I have a Mamiya 6 V folder that had a sticky shutter at slow speeds. I managed to fix that, and I calibrated the rangefinder at the same time. I've just run my first roll of film through it, but I had a problem with rangefinder going out of calibration. I was out on the road at the time, so just shot the roll by guessing the focus and by and large I got it right, it's only a couple of low light (wide open aperture) shots where I got it wrong.
Anyway, when I got home and set about calibrating it, I couldn't get it all lined up before the adjusting screw completely unwound. Removing the top plate, I found the following:
RED - Shows the part that moves within the rangefinder. It is pushed out by a spring where the purple arrow is. At the moment, with this pulled all the way out (towards the arrow), I can just about say it's calibrated to infinity. It's not perfect though, and it won't stay all the way out with the rest of the mechanism assembled.
GREEN CIRCLE - shows two alignment marks on the focus actuating cog (the big silver one, which actuates the movement of the film plane) and the rangefinder cog, with its expanding circle. The other alignment mark you can see there - the longer one - aligns with the grub screw when the focus is at its close limit.
YELLOW - Grub screw. This is has a pointed end that pushes onto a thin metal band, keeping it held against the expanding circle. Before I had this problem, this adjustment was easy to make and had plenty of the screw still engaged.
BLUE - The hole used to calibrate vertical adjustment of the rangefinder
ORANGE - the rangefinder window.
I can't see how I can calibrate this without altering parts (filing/grinding), and that can't be right because it was fine before. I feel like something critical must have moved or broken at some point, but I can't work out what. I don't want to adjust the focusing limits on the silver cog because I know that the focus works, it's just the rangefinder that doesn't.
So, can anyone help me identify where I'm going wrong?
Thanks |
