Sciencemadness Discussion Board
Not logged in [Login ]
Go To Bottom

Printable Version  
Author: Subject: Buchi Screw Wheel 00565 needed!
stoichiometric_steve
International Hazard
*****




Posts: 811
Registered: 14-12-2005
Member Is Offline

Mood: satyric

[*] posted on 18-12-2011 at 15:42
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




View user's profile View All Posts By User
zoombafu
National Hazard
****




Posts: 255
Registered: 21-11-2011
Location: U.S.
Member Is Offline

Mood: sciencey

[*] posted on 18-12-2011 at 17:30


Contact the maker of your rotovap, im sure they will sell spare parts.



View user's profile Visit user's homepage View All Posts By User
benzylchloride1
National Hazard
****




Posts: 299
Registered: 16-3-2007
Member Is Offline

Mood: Pushing the envelope of synthetic chemistry in one's basement

[*] posted on 18-12-2011 at 22:49


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
View user's profile View All Posts By User
Arthur Dent
International Hazard
*****




Posts: 545
Registered: 22-10-2010
Member Is Offline

Mood: entropic

[*] posted on 19-12-2011 at 04:36


Quote: Originally posted by benzylchloride1  
Expect about $100 with shipping for a new screw wheel.


$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 ---
View user's profile View All Posts By User
stoichiometric_steve
International Hazard
*****




Posts: 811
Registered: 14-12-2005
Member Is Offline

Mood: satyric

[*] posted on 19-12-2011 at 13:01


well yeah, it's about 50 EUR. i find that disturbingly expensive.



View user's profile View All Posts By User
edgecase
Hazard to Self
**




Posts: 65
Registered: 4-11-2011
Location: Ontario, Canada
Member Is Offline

Mood: Viscous

[*] posted on 22-6-2012 at 04:52


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

Buchi_worm_gear_fail.jpg - 82kB
View user's profile View All Posts By User
peach
Bon Vivant
*****




Posts: 1428
Registered: 14-11-2008
Member Is Offline

Mood: No Mood

[*] posted on 22-6-2012 at 07:57


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]
View user's profile View All Posts By User
edgecase
Hazard to Self
**




Posts: 65
Registered: 4-11-2011
Location: Ontario, Canada
Member Is Offline

Mood: Viscous

[*] posted on 22-6-2012 at 16:58


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 527 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]
View user's profile View All Posts By User
chemrox
International Hazard
*****




Posts: 2930
Registered: 18-1-2007
Location: UTM
Member Is Offline

Mood: psychedelic

[*] posted on 23-6-2012 at 01:04


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.



"Ignorance is the Mother of Devotion." — Robert Burton.
View user's profile View All Posts By User
spankyetal
Harmless
*




Posts: 23
Registered: 24-7-2017
Member Is Offline

Mood: No Mood

[*] posted on 21-6-2020 at 10:36
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
View user's profile View All Posts By User
DavidJR
International Hazard
*****




Posts: 908
Registered: 1-1-2018
Location: Scotland
Member Is Offline

Mood: Tired

[*] posted on 21-6-2020 at 11:29


Quote: Originally posted by spankyetal  

Repairs can be kept below $25.00 using a clay mold, epoxy resin and Dremel grinding touch-up. So far so good.


Maybe an epoxy putty like milliput would be good for this?
View user's profile View All Posts By User
Heptylene
National Hazard
****




Posts: 319
Registered: 22-10-2016
Member Is Offline

Mood: No Mood

[*] posted on 21-6-2020 at 23:49


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.
View user's profile View All Posts By User
Dr.Bob
International Hazard
*****




Posts: 2350
Registered: 26-1-2011
Location: USA - NC
Member Is Offline

Mood: No Mood

[*] posted on 22-6-2020 at 06:38


There is someone on here who made me some replacement gears, I will ask him to check with you.

View user's profile View All Posts By User
OldNubbins
Hazard to Others
***




Posts: 135
Registered: 2-2-2017
Location: CA
Member Is Offline

Mood: Comfortably Numb

[*] posted on 22-6-2020 at 12:37


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.
View user's profile View All Posts By User

  Go To Top