andre178
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chipped glass
Hi, I do not yet have to acquire a new rotovap, but the old one got chipped at the end port (ie. where you attach it to the pear shaped evap flask),
I was wondering if there is any super glue that will help me attach the chipped piece, which I still have and fits perfectly to the edge of the broken
adaptor piece.
Here is a picture of it,
I suppose the glue should be able to withstand pressure and temperature changes.
Thank you
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smuv
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There is no need to fix it. 2 out of the 4 rotovapps In the lab where I work are chipped in the same place, they work fine. Also, glue's don't hold
up well to organic solvents.
If it were not directly on the joint, you could fuse the two pieces together but in this case you will distort the joint.
"Titanium tetrachloride…You sly temptress." --Walter Bishop
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psychokinetic
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The only surefire way to fix would be re-blowing, but we don't all have the equipment and skills for that 
Even then, it may still have problems....but as smuv noted, half the time they still work anyway.
“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found
the object of his search.
I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”
-Tesla
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DJF90
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Now I'm not entirely sure, but it looks like that cone could be screwed out. Granted you would have to find a replacement but if it's as it looks then
it shouldnt be too hard to change. Alternatively, don't worry about it, unless the chip begins to propagate (as a crack perhaps) throughout the cone.
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crazyboy
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Quote: Originally posted by DJF90  | | Now I'm not entirely sure, but it looks like that cone could be screwed out. Granted you would have to find a replacement but if it's as it looks then
it shouldnt be too hard to change. Alternatively, don't worry about it, unless the chip begins to propagate (as a crack perhaps) throughout the cone.
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Those threads are for a combi-clip. You don't really need to worry about it unless it affects its functionality. If it does you might be able to send
it to a glass repair specialist.
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smuv
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@psycho* I did not say they work half the time. When they are chipped like that they ALWAYS work. There is nothing wrong with the joint, it is a
little shorter but it still works fine.
@DJ590 the cone can be removed, by unscrewing the nut marked "this" in the attached picture. This will expose a glass flange connected to the broken
joint. The flange/joint piece may be replaced, BUT IT IS UNNECESSARY. Also note to the OP, the rotovap can be locked from rotation, which
facilitates unscrewing the nut, there is usually a button somewhere on the housing of the rotovap to lock it.
@OP If you just got the rotovap used, you may as well take the whole rotovap apart to make sure the bearings are good. When the bearing cease, they
strip the drive gears, which is a pain.
[Edited on 1-21-2010 by smuv]
"Titanium tetrachloride…You sly temptress." --Walter Bishop
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psychokinetic
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| Quote: Originally posted by smuv | | @psycho* I did not say they work half the time. When they are chipped like that they ALWAYS work. There is nothing wrong with the joint, it is a
little shorter but it still works fine |
Right you are. Bad choice of colloquial wording on my part.
“If Edison had a needle to find in a haystack, he would proceed at once with the diligence of the bee to examine straw after straw until he found
the object of his search.
I was a sorry witness of such doings, knowing that a little theory and calculation would have saved him ninety per cent of his labor.”
-Tesla
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andre178
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Registered: 11-12-2009
Location: San Diego, CA
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yep you guys were right on all accounts, I can use it like that, I'm just really finnicky with the glassware and found a replacement middle glass tube
w/ joint, unscrewed the old one and replaced for now.
And you brought up a good point, the rotovap bearings may be going out, that's the reason why this whole things came into play, it doesn't seal a
vaccuum so well anymore.
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