Question about O ring size

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Question about O ring size

Postby bruce9241 » August 19th, 2016, 1:23 am

In the mod/repair thread above it says, "O-ring 85x2mm nitrile NBR with 70 hardness. "

What does the 85x2mm mean? I looked online and found a few rings that may work, but I'm not sure if that, "85" means inside diameter, or outside diameter. I'm sure the 2mm means the thickness, just need to know if it's inside or outside diameter.
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Re: Question about O ring size

Postby glnc222 » August 19th, 2016, 1:07 pm

Checking with contributor of that info, but at 2mm thick 85 ID would be unusual 89 OD and they all seem to be listed by OD. e.g. https://www.amazon.com/Metric-Rings-Black-Nitrile-Rubber/dp/B008AGN7B0/ref=sr_1_4?ie=UTF8&qid=1471626096&sr=8-4&keywords=O-+ring+85+mm
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Re: Question about O ring size

Postby bruce9241 » August 20th, 2016, 2:49 pm

Thank you. looks like i bought the wrong ones at https://www.globaloring.com/n2-00x085-2 ... l?___SID=U

I'll give the ones I bought a try and report back. I also ordered the ones at amazon from your link. Thanks
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Re: Question about O ring size

Postby glnc222 » August 20th, 2016, 4:05 pm

Try both if possible. I do not have perfect info. Try to measure the original, by length. I do not think many have been replaced. Motor failure not in belt. 4mm diameter difference is only half an inch stretch around the length. Problem would be if one too loose.
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Re: Question about O ring size

Postby glnc222 » August 20th, 2016, 7:22 pm

correction
Source now says using 85 ID, not OD I suggested. Courtesy member shirgal:
"85 is ID and CS is about 1.85mm Thicker CS as 2mm might work But 81 I think will be too tight
And could kill the motor sooner with too much side force."

LidarOring.JPG
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Re: Question about O ring size

Postby bruce9241 » August 20th, 2016, 8:14 pm

Okay, thank you very much for the advice. I'll give the rings a try when they arrive.
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Re: Question about O ring size

Postby viper001 » October 25th, 2016, 2:26 pm

Using the advice in this thread I ordered some of these O ring replacments and installed them in my 2 Botvac robots. The original O rings were kind of a pinkish/red in color, the replacements were black. While the original rings seemed to last a long while (2 or more years??), these black ones I found on Ebay appear dead after only a month. Has anyone been successful in finding replacements that match the OEM rings? Is there some reason none of the robot supply sites aren't just selling those? If they are and I missed it I would appreciate a shove in that direction. As long as the Botvac has been on the market I would think a lot of folks are needing these now? TIA!
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Re: Question about O ring size

Postby glnc222 » October 26th, 2016, 12:21 am

ServoCity robotics supply carries O-ring belts, not just plumbing sealing O-rings which might be different materials.
They have 1/8 thick in 3 in (76mm) and 3.5 in (89mm) ID compared to the 85mm ID recommended. There is a stretch factor though. https://www.servocity.com/0-125-1-8-o-ring-belts
No belts listed at TrossenRobotics.
Ebay lists specific Neato XV lidar belts around $5. Drive belts are listed by specific machine use instead of by size.
Technical sites advise electronics distributors for belts, as used in CD drives etc.
For example Consolidated Electronics http://www.ceitron.com/passive/belt.html. The "Extra Large Round"
has an 83.25mm x 3.5 thick http://www.ceitron.com/passive/rndXLbelt.html also an 88mm maybe more correct?
Technical sites also caution against measuring used belts because permanently stretched. What a mess.
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Re: Question about O ring size

Postby glnc222 » December 16th, 2016, 11:26 pm

A German VR100 user reported the official part was specified 82 x 2 mm round material NBR 70th -- for whatever that is worth, not further info. Needed replacement after four year usage.
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Re: Question about O ring size

Postby shirgal » December 18th, 2016, 7:05 pm

glnc222 wrote:A German VR100 user reported the official part was specified 82 x 2 mm round material NBR 70th -- for whatever that is worth, not further info. Needed replacement after four year usage.


Can you refer by this report 82 = ID or OD ?
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Re: Question about O ring size

Postby glnc222 » December 19th, 2016, 1:03 am

Poster did not say and I cannot find the post again on Roboter-Forum to ask. Might not have been on the label anyway, Vorwerk part.
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Re: Question about O ring size

Postby glnc222 » January 20th, 2017, 2:31 am

German poster replied VR100 package 85 x 2 lidar, 26 x 2 side brush O-rings, Nitrile rubber type NBR 70. 5 Euros on net. Referenced standard for all sizes DIN3771 (one of several standards for sizes). The standard uses ID and for thin size shows only 82 and 88, suggesting the 85 is an OD, with ID 82, double the 2mm width making the difference.
Dealers may list by either OD or ID, which is confusing.
DIN3771 tables at http://o-ring.info/en/o-ring/Technical%20Handbook/16%20-%20ERIKS%20nv%20-%20O-ring%20Technical%20handbook%20-%20O-ring%20Size%20Chart.pdf
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