stoichiometric_steve
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Buchi Screw Wheel 00565 needed!
I'm looking for a spare part, namely the Buchi Screw Wheel part. no. 00565 for a Rotavapor RE-111 motor. Its basically a plastic toothed wheel.
check page 16 of this manual for details:
RE-11X Manual
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zoombafu
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Contact the maker of your rotovap, im sure they will sell spare parts.
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benzylchloride1
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Check Buchi's Amazon store, I bought one of these from them. Expect about $100 with shipping for a new screw wheel.
Amateur NMR spectroscopist
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Arthur Dent
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$100 for a plastic gear? I'd say this is a perfect candidate for 3-D printing... Check-out if the old gear can be scanned, retouched and reproduced, I
bet this would be less expensive.
Robert
--- Art is making something out of nothing and selling it. - Frank Zappa ---
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stoichiometric_steve
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well yeah, it's about 50 EUR. i find that disturbingly expensive.
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edgecase
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The "screw wheel", technically in north american english, it is a worm wheel, which meshes with a worm gear on the shaft of the motor.
It looks like a manufacturing defect, either the plastic is stretched very tight or solvents have caused it to shrink. Brass or even steel would be
better since it's such a low torque application. It's not like they aren't charging enough, and have to use "cheap" plastic.
I'm going to get mine measured up, the local industrial bearing shop has a set of gear pitch gauges. I would probably spend the $100 on a Buchi
original, except that based on the number of people with problems, it seems like a bad design.
http://coplanar.net/gallery2/main.php?g2_itemId=509
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peach
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Buchi seem to love using none standard parts where there's no need to.
There are coated labyrinth seals designed for high vacuum applications at a fraction of the price of theirs.
I get a buzz off the one I have, literally... because the capacitor's can or variac in there is leaking to ground. My mates flicks the breakers. A bit
of insulation would be nice for all that money.
[Edited on 22-6-2012 by peach]
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edgecase
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So I just spent about an hour measuring up this gear, and searching for something that could be bored out on a lathe to make it better than original.
I may have found one made of Delrin (or steel, imagine! heat and solvent resistant!)
It's a bit odd, they are using a 4 thread worm gear, but instead of a matching worm wheel, they are just using a helical gear. My cheap angle finder
shows about 18 degree helix angle, 48 teeth, 2.6 inch O.D. 3/8 inch face width. I hassled the bearing shop this afternoon and got roughly 20
Diametral Pitch from one of their gear pitch gauges, 20 degree pressure angle.
http://www.hpcgears.com/products/helical_gears.htm
PARALLEL helical gears, Imperial(DP), 20DP, yields the attached catalog.
PSH20-48 looks like a good match, unsure if it's LH or RH. Price listed is 15 pounds sterling? I don't see a north american distributor tho ;<
Attachment: helicalgears_20dp.pdf (288kB)
This file has been downloaded 850 times
I'm unsure if Delrin is a good material for the heat/solvents, though it is great for wear against the steel worm gear. Steel gear might be just fine
too, there's almost no torque involved in spinning a flask in water or oil. Thoughts?
[Edited on 2012-6-23 by edgecase]
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chemrox
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I have motors. p2p me an I can arrange something with you. I bought a bunch of condensors, stands and motors a few years ago. I plant to assemble
rotovaps and sell them. The stand alone motors are "R" types and I have a couple of R-11 stands. You could pull the gear out of a motor I have that
needs to be re-packed with grease.
"When you let the dumbasses vote you end up with populism followed by autocracy and getting back is a bitch." Plato (sort of)
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spankyetal
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Buchi worm gear new or repaired
the gap damage in the worm gear face is a common occurrence. 66% of used R-111 drives had these damages or gaps, As of 2020 Buchi sells them for
$75.00. But there is a $120.00 minimum.
You can reach Buchi US to get their downloadable order form to order a new gear at:
ordermanagement@buchi.com or fax to 302-652-8777.
You can place an order through your local Distributor such as Fisher Scientific or VWR.
Repairs can be kept below $25.00 using a clay mold, epoxy resin and Dremel grinding touch-up. So far so good.
TextText
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DavidJR
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Maybe an epoxy putty like milliput would be good for this?
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Heptylene
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Maybe you could make a new tooth from thick plastic plate using a jewelers saw and some files? For $100 it's worth the effort.
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Dr.Bob
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There is someone on here who made me some replacement gears, I will ask him to check with you.
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OldNubbins
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Looks like this thread was necrotized, but for future reference, I have some replacement gears I can send for the price of shipping or they can be
ordered less than $15 each from BMC3D. I also have the 3D model if you want to print your own.
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johnsonnamedborris99
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Quote: Originally posted by OldNubbins  | | Looks like this thread was necrotized, but for future reference, I have some replacement gears I can send for the price of shipping or they can be
ordered less than $15 each from BMC3D. I also have the 3D model if you want to print your own. |
i have been looking for this worm wheel for mine too. could i get a copy of the file? if you still have another one you are willing to sell i will
take it off your hands ?
just another politically incorrect canceled culture
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MOF guru
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| Quote: Originally posted by OldNubbins | | Looks like this thread was necrotized, but for future reference, I have some replacement gears I can send for the price of shipping or they can be
ordered less than $15 each from BMC3D. I also have the 3D model if you want to print your own. |
We have the same problem with our Buchi rotavap.
Can anyone advise which exact type of helical gear it actually is from BMC3D?
Many thx in advance!
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Dr.Bob
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That design was for a R-114 I believe. If you are in the US, he might be willing to ship you the part for postage and such. If not, I might have
some spare parts that would work, but I will be out the next week or so. If you are in the US and can't find the part, send me a note, and I will
get back when I can.
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MOF guru
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Thanks for your fast reply. I am looking for one for RE-111. From the manual it is part no. 00565. I am located in Germany/Switzerland, hence it would
probably be easier to exchange the size/particular type (e.g. Order number/Description) or the even the 3D Model of the helical gear and I will search
for it here in Europe. As you have shown already, it is commercially available, although it is definitely „special“. Many thanks in advance for
all your help!
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