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Re: Rod screws needing replaced...help?

Author: clarnibass
Date: 2018-04-06 10:54

I don't know from memory if B&H could be either imperial or metric or if they have always used one type.

If your calipers are accurate, then 0.001" is good enough to check the thread diameter of the screws... if it's not too worn... keep in mind they are usually slightly under size from manufacturing and some companies use very non-standard sizes sometimes.

It might be worth getting metric and imperial thread gauges. Good to have anyway unless you really only need it for this one instrument.

The diameter of the rods themselves is hard to do by measuring, too many variables. The regular method is to check one, then check a size larger or smaller depending on the fit, but of course this requires a stock of sizes.

Check several screws in various posts. That way you can often tell if some screws are too worn or if only some posts are worn. Even though posts are usually brass or nickel-silver and screws are usually steel, sometimes the screws wear and not the posts.

If the fit of the current rods is good, then it might be possible to do this by measuring, but you have to use something far more accurate than 0.001" calipers. Good digital calipers is the least accurate I would use, preferring a micrometer. Even then, if you order doesn't mean it's the same as specified, there are tolerances, etc. If it ends up 0.01mm too large it might not fit. If you went with something slightly smaller to be safe and then it's a tiny bit smaller, now it's too loose.

After you check the thread diameter it will give a pretty good idea of possible thread sizes. If you can have a really magnified photo of the threads next to a known length (e.g. your calipers open to exactly 5mm) then it might be possible to get pretty close to the right sizes. I've found the thread for a couple of people before this way when they didn't have good measuring tools and were on a different continent

Getting the thread gauge would be better

I know a repairer who is supposed to be reputable in Utah, I think he is in Springville. If that might help I can email you his contact details.

Post Edited (2018-04-06 15:03)

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