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G-Coupled
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Unless it's one of the beefiest, heavy and sturdy stands ever with similar quality clamps etc., I'm gonna say - no, it's not worth the risk.
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Yttrium2
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Is the best way to setup the stands is having 1 clamp above the boiling flask and 1 clamp above the reviewing flask?
I see some pictures showing the condenser being supported by a special clamp and the reviewing flask hanging or touching the bottom.
What is this condenser clamp called? A condenser clamp?
How do you support your distillation apparatus?
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Yttrium2
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Because I don't know where to clamp, I'm also confused on what type of clamps I'll need. It's been a while since I've had a distillation setup, and
I'm wanting to get everything planned in advance.
Can someone help me with a good cheap type of clamp I'll need to support my distillation unit?
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j_sum1
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It is good practice to clamp the flask at the neck and have the heat source on a lab jack (or brick). That way you can drop the heat in an instant if
required.
I also clamp tall items: columns and addition funnels. I also clamp the condenser at the middle for stability. So, typically 2-3 clamps per
distillation and I use 2 of the rods on my rack.
Of course you can use fewer clamps and stands. But it comes at a cost to flexability, safety and the ability to make quick changes. I have used a
short path straight from a rbf in a mantle with no clamps. But stability is a feature that is always desirable.
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draculic acid69
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On eBay there's plenty of bossclamps,ring clamps,etc,etc you just happened to pick the smallest cheapest one that isn't big enough for anything but
test tubes.spend a bit more and get bigger better ones.
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Yttrium2
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Quote: Originally posted by draculic acid69  | | On eBay there's plenty of bossclamps,ring clamps,etc,etc you just happened to pick the smallest cheapest one that isn't big enough for anything but
test tubes.spend a bit more and get bigger better ones. |
I didn't purchase it.
I know of 1 clamp that will work for holding a condenser, but I'm unsure about the other ones.
Any recommendations for an inexpensive clamp that can hold a liebig
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draculic acid69
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Type "laboratory clamps eBay" into Google.
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Sulaiman
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I have tried a few types of clamp;
small three prong, cheap, good for holding thermometer in beaker etc.
cheap large clamp, ok for columns and condensers
large three prong, good for flasks, columns and condensers
large four finger, my favourite, good for flasks, columns and condensers
sometimes not as convenient for holding flasks as the three prong above
none of the above are perfect, but all are usable.
CAUTION : Hobby Chemist, not Professional or even Amateur
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G-Coupled
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Now they look more the part IMO - sturdy enough to comfortably use, but cheap enough to afford - where are they from? They the kind of thing one can
find on the 'bay etc.?
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Sulaiman
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The four photo's above are copied from current eBay uk listings as I have no usable photo's of my own equipment.
CAUTION : Hobby Chemist, not Professional or even Amateur
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wg48temp9
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| Quote: Originally posted by Sulaiman | I have tried a few types of clamp;
small three prong, cheap, good for holding thermometer in beaker etc.
cheap large clamp, ok for columns and condensers
large three prong, good for flasks, columns and condensers
large four finger, my favourite, good for flasks, columns and condensers
sometimes not as convenient for holding flasks as the three prong above
. |
Below is more detail to the above comments:
The first clamp: the one I purchased broke at the base of the single finger with mild tightening of the clamp wing nut, probably due to the weak and
brittle (not tough) diecast material and the stress raising point at the base of the finger caused by the abrupt change in dimensions (not smoothly
evolving in to the base). Yes it probably can clamp a thermometer but sooner or later you will use too much clamping force and the finger will snap
off.
The second clamp: the one I purchase, the clamp on either side was made of sheet steel certainly tough enough to resist the force I could apply with
my fingers to the wing nut. There is no bushing between the clamping screw and the fingers so the threads tend to jam on the punched hole in finger
and play at both ends can cause the clamping force to suddenly relax. The parallel clamp make it unreliable for for clamping anything other than
parallel sided equipment. The plastic covering the clamps is low friction so useless unless the equipment has rim to stop it sliding out. Its a cheap
option and if your careful usable. You may need to bend the fingers to get them to more uniformly clamp and a rim is needed on anything heavy to stop
it sliding out.
The last two clamps are designed well. Both have good fitting bushings on the clamping screws and smooth transition to the bases. The rubber and cork
are excellent clamping friction and the cork will not melt. The three pronged unit is excellent for clamping none parallel sided items such as the
tapered outer surface of females joints. The four pronged unit is ideal for parallel sided items but with additional packed anything can be clamped.
Both are excellent but tend to be several times the price of the first two.
For the low cost option buy the second item and adjust the sheet metal finger for better clamping and add extra packing if needed.
[Edited on 12/1/2019 by wg48temp9]
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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draculic acid69
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I bought a few of the first kind of clamps and they're barely big enough for anything bigger than a test tube.even a 24/29 joint is it's absolute
maximum size it can open to.
When it comes to lab clamps and stands cheap means tiny.
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Yttrium2
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I was thinking of going with this deal, it seems to be phenomenal for the price. But it's getting aot of bad rap for some reason in the reviews
https://www.amazon.com/Support-Stand-Coated-Base-Size/dp/B07...
What are some thoughts on this one ^
Also, I have seen distillation apparatuses commonly held up with 1 clamp on the condenser, can anyone comment on setting up like this?
I'm still having difficulties figuring out which stands to buy and what clamps, I really hate having to reorder them
[Edited on 12/12/2019 by Yttrium2]
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B(a)P
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The reviews indicate the base does not sit flat and is light weight. Seems very unstable. This is backed up by it being 1.5 kg total weight, which is
on the light side. I would steer clear.
Have you looked for second hand ones on eBay?
[Edited on 12-12-2019 by B(a)P]
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wg48temp9
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The base of the stand in the above discussion looks like sheet metal. Essentially a rectangular box with no bottom so its weight must be small
compared to a solid cast base. However it could be filled in with cement easily or even better if you have a cheap source of lead fill it with that.
The plastic feet look like they are a push fit on the sheet metal of the box sides which means the height could be easily adjusted by filing down the
box edge to make each foot sit on a flat surface. Yes that's moding something just purchased but a stand with a solid cast iron base is likely to
cost much more.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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Sulaiman
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| Quote: Originally posted by Yttrium2 | What are some thoughts on this one ^
Also, I have seen distillation apparatuses commonly held up with 1 clamp on the condenser, can anyone comment on setting up like this?
I'm still having difficulties figuring out which stands to buy and what clamps, I really hate having to reorder them |
My thoughts on that one are : do not buy it, even if on a tight budget.
I would not set up a distillation kit by just clamping the condenser.
I clamp the boiling pot, the condenser and the receiving pot,
this requires two stands and three clamps,
this is because ;
. I do not want to stress the glassware
. I do not trust Keck clips 100%, even though I have both plastic and stainless steel to choose from.
Even moderately solid/heavy stand bases sometimes need additional weight (brick, old transformer etc.) to be stable,
I bought two reasonable quality stands,
but if I was starting again I would consider making my own stands
using cement/concrete for the bases and a 10mm to 16mm dia. steel rod of at least 500mm height.
(I have a bunch of 14mm dia. x 1.2m long copper clad steel earthing rods that I got very cheaply via eBay, that will be my 'lattice' when I'm reunited
with my chemistry stuff)
Stands and clamps are obviously useful for chemistry glassware setups,
they are also useful for holding glassware to dry,
and you will find many other uses once you have them.
These are the best boss head clamps that I've bought so far
https://www.ebay.co.uk/itm/8x-LAB-STAND-BOSS-HEAD-Clamp-Hold...
but they were 1/2 the price when I bought them.
CAUTION : Hobby Chemist, not Professional or even Amateur
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wg48temp9
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If you are making your own bases the bricks from storage heaters are usually very dense and weigh about 7kg. You could also use small paving blocks.
Sets of weight discs can be bought for about £10 or for much less at a charity shop.
Both make solids bases particularly needed for over head stirrers that wobble around.
[Edited on 12/12/2019 by wg48temp9]
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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draculic acid69
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I found a new use for the labstand mentioned at the start of the thread.its too small for my glass really but I am now using this as a labjack
substitute for holding up receiving flasks which it does well.but it's too small for anything else really.
 
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Yttrium2
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I am at my wits end looking at stands guys.
Were talking a glassware purchase of $ 45 USD, and were looking at around or above $ 60 USD for the stands.
Where can I find a good stand / clamp combination? All the stands that I see come with the rings and those are useless.
To the above poster, @ draculic acid69, how does that act as a lab jack? You cannot lower or raise that receiving flask without having to raise/lower
the rest of your setup.
(Edit nevermind I see it now)
If anyone can provide links to what will hold up a distillation apparatus I'd greatly appreciate it.
I'm thinking of going with united nuclear, or the local science store in town, that way I don't have to pay shipping prices. Pretty sure they are like
$ 17 USD for some eisco lab stands/clamps.
I dont need the rings, just the finger clamps, bossheads, plate, and rod.
It is so frustrating that these stands are so costly, it is more for the stands than it is for the actual labware.
[Edited on 7/4/2020 by Yttrium2]
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Yttrium2
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not sure how to fix a rod to the metal weights
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Dr.Bob
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I still have a few 3 prong clamps, bossheads, and maybe a lab stand left, plus lots of hardware that needs work, due to corrosion, frozen screws, or
broken parts, which could be repairs or the good parts combined. If you want to make a lab stand from stone, use granite or quartzstone, not marble,
it will dissolve in acid. You just need a heavy base and a simple 1/2" rod of some sort.
Bob
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Yttrium2
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| Quote: Originally posted by Dr.Bob | I still have a few 3 prong clamps, bossheads, and maybe a lab stand left, plus lots of hardware that needs work, due to corrosion, frozen screws, or
broken parts, which could be repairs or the good parts combined. If you want to make a lab stand from stone, use granite or quartzstone, not marble,
it will dissolve in acid. You just need a heavy base and a simple 1/2" rod of some sort.
Bob |
perhaps granite and JB weld, I'm not sure how else to affix the rod to the granite. Not sure how I'm going to get it drilled either, I'll probably
figure that part out though
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Yttrium2
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where can I find an inexpensive jig for drilling 1/2" holes in granite?
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Yttrium2
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this wont work will it?
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wg48temp9
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| Quote: Originally posted by Yttrium2 | | Quote: Originally posted by Dr.Bob | I still have a few 3 prong clamps, bossheads, and maybe a lab stand left, plus lots of hardware that needs work, due to corrosion, frozen screws, or
broken parts, which could be repairs or the good parts combined. If you want to make a lab stand from stone, use granite or quartzstone, not marble,
it will dissolve in acid. You just need a heavy base and a simple 1/2" rod of some sort.
Bob |
perhaps granite and JB weld, I'm not sure how else to affix the rod to the granite. Not sure how I'm going to get it drilled either, I'll probably
figure that part out though |
Glue it in after you have filed several notches in the part of the rod that will be glued.
I am wg48 but not on my usual pc hence the temp handle.
Thank goodness for Fleming and the fungi.
Old codger' lives matters, wear a mask and help save them.
Be aware of demagoguery, keep your frontal lobes fully engaged.
I don't know who invented mRNA vaccines but they should get a fancy medal and I hope they made a shed load of money from it.
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