Unifllow micrometer problem

[Jesse Heywood]

I was trying to do some testing comparing the Uniflow with a large diameter micrometer against the conversion with a quick cylinder. All went well until I put the Uniflow back together. First my charges were erratic, then I had no adjustment on the micrometer.

When i dismantled the measure I found the threads on the end of the metering screw were stripped, about 3/8". RCBS is sending me a new screw, but they steered clear of suggesting what I did wrong.

 

[fguffey]

When i dismantled the measure I found the threads on the end of the metering screw were stripped, about 3/8". RCBS is sending me a new screw, but they steered clear of suggesting what I did wrong.

I do not know. There are times those stories start like: "It handled like a doll buggy then suddenly and all at once etc..". All of my Uniflow powder measures are micro adjust. I use a dial caliper to measure the protrusion of the adjuster from the sleeve. The old Herter powder measures did not have threads, the adjuster was smooth and used a collet to secure.

F. Guffey

 

[GW Staar]

I can only think of two possibilities:

1. you never had good deep threads on the screw from the factory, or

2. you cross-threaded.......and 2 more than likely finished off number 1.......IOW's threaded shallow....then finished off with cross-threading.

RCBS is good about not questioning our abilities. I learned early on in adulthood, the hard way, about how easy it is to cross-thread even with good deep threads.....when I was younger, I did my share of ruining them. If a thread binds at all quite often it's crossed. Forcing only sets it wrong, repeating finishes them off.

In the case of the mic......the screw/mic threads are dampened (I think with an "O" ring), threads are more shallow than some....and they don't turn freely for a reason....so they keep an adjustment. That makes it harder to tell whether it's crossed or not. As you now know you have to be careful.....baby turns to start.

I haven't ruined one yet......doesn't mean I won't.

 

[cfullgraf]

I learned early on in adulthood, the hard way, about how easy it is to cross-thread even with good deep threads.....when I was younger, I did my share of ruining them. If a thread binds at all quite often it's crossed. Forcing only sets it wrong, repeating finishes them off.
/QUOTE]


After 45 years of turning wrenches, I'm still stripping threads once in a while these days. I recently stripped a couple wheel studs on my race car due to a little dirt on the threads and haste on my part. Replacement was not difficult but one of those aggregating tasks you wish you did have to do.

Measuring instruments have fairly fragile threads and they can be easily damaged once in a while.

RCBS seems to be extra patient with us reloaders.