looking for recommendations to clean gummy jewels
Starrett Last Word indicator, 0.0001 graduations, main problem seems to be goop
I'd throw it in the ultrasonic watch cleaning machine with watch cleaner. I think the main ingredient in the cleaner is ammonia.
if you don't have ultrasonic, you can sharpen a piece of soft wood with a knife and use that
I don't have a sonic, or watch cleaner - but I do have window cleaner - I think that is similar
sure I bet that would work
you can press the joint into the center of the jewel and spin it. then check with the microscope to make sure it's clean and you get the wood out.
joint = point? or am I missing some watch lingo?
I have gummy stuff that can be good for finishing off - think something like silly putty
err right, point
I was thinking of some solvent - dip the toothpick point in starting fluid or something
window cleaner will have water in it, so follow up with alcohol
I have starrett's fancy instrument oil for putting it back together - supposed to be non-gumming
good. use 1/4 the amount that seems right :-)
I'm thinking a drop on the bench, then use the toothpick
maybe a clean piece of wire instead? the toothpick might contaminate it.
I could do that
turns out I actually have some alcohol
the trickiest one is gonna be the "preload wheel" (no idea what its actually called
it has a hairspring that is staked into the housing, so I can't remove the wheel, just push it to the side to access the lower bearing
ah I had that in my Gem indicator. I think it had a hairspring that could be unpinned.
I could probalby pull the pin (brass, in a steel post), but I'm afraid to
oh it is pinned - glad to hear it is at least as good as a Gem.
its a starrett
(an older one)
bending the hairspring would be worse than dropping/losing the pin.
no idea how I'd get the pin out, or put it back in
it just takes tweezers
you don't pull on the pin, you squeeze the small end toward the post. to replace, squeeze the big end back the other way toward the post.
hmm, my arrangement doesn't sound like what you are describing
I have a round steel post, with a crosswise slot in it (all the way across, from the top end)
I've cleaned one indicator in my life so I'm assuming it's like a watch :-)
the spring is in the slot, and a small round brass pin is pushed down right in the center of the slot, pushing the spring to the side of the slot
pin and post are concentric
oh the pin is perpendicular to the spring?
top of brass pin looks like it was cut of with dikes
ah then it does sound like you'd have to pull it
I think I'll stick with plan A - clean around that wheel
there are 6 bearings - bottom and top of main wheel, bottom and top of needle shaft/pinion assy, bottom and top of preload wheel
I can easily to all three tops (I have the top plate off)
I can do the bottom of the main wheel (that is in the body, not the round part with the gears)
I can do the needle shaft bottom - that is in the center of the round part, not hidden
and I can do the preload bottom bearing from the outside (bottom) of the round part (it is removed from the body)
just have to make sure I don't tip it too much, don't want the preload gear hanging by the spring
in a watch, the hairspring can almost always support the balance wheel without distortion. I would be surprised if the indicator is different
I'm going to try not to test that
yes, trust your eyes more than me
heh, toothpick looks like a 4x4
found out how to remove the spring
the post is drilled all the way thru, you push the pin out from the bottom
it is tapered
get it cleaned?
[03:02:42] <cradek> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230185123205
expensive, but an interesting type for mounting on a mill table
the motor is around the spindle?
or is it underneath, with belts going up?
no, I guess one of the pics shows air underneath
regarding hairsprings - I don't know how much preload - gonna guess
should I be turning it in the direction that tightens the spring, or loosens it?
* jmkasunich guesses tightening
all I can guess is you should put it back however it started
well, it is back together
and even works, sort of
the part I disassembled (the dial/gear assy) works, but the lever inside the body still seems "weak"
there is a spring on that lever that is reversed by a small manual lever outside - that spring should be much stronger than the needle preload, so the lever will go the desired direction
but its not - either the spring is weak, or something is binding or gummy in there
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