Author Topic: Plastic reduction gear set  (Read 1844 times)

Online Jo

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Plastic reduction gear set
« on: June 16, 2020, 09:19:41 AM »
Hi Guys I am hoping you maybe able to point me towards where I can buy some replacement plastic gears.

I have two Eufy robovacs “Sweep” (11) and “Soo” (11s) both have had damaged spur gears in the reduction gearbox attached to the side brush motor. Luckily I managed to pick up a pair of spare assemblies from Fleabay for about £6 each about a year ago but these are no longer available.

So that I can continue to repair my two house mates I am looking for a suppler of just the plastic gears. Having dug them out they seem to be:  primary gear helical 0.5 Mod 42 tooth, intermediate gear pair: helical 0.5 Mod 9 tooth driving Spur gear 0.5 Mod 10 tooth, final drive gear 0.5 Mod 46 tooth. Using those numbers the ratio would seem to be 21:1  :headscratch:  The only other clue is on the gearbox outer is the part number: 0018203 and “RC” and “B2”.

I am assuming they are a standard motor reduction gear set but does anyone have any ideas what else might use them? Or where I could buy some from?

Jo
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Offline Bluechip

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Re: Plastic reduction gear set
« Reply #1 on: June 16, 2020, 09:49:17 AM »
Hi Guys I am hoping you maybe able to point me towards where I can buy some replacement plastic gears.

I have two Eufy robovacs “Sweep” (11) and “Soo” (11s) both have had damaged spur gears in the reduction gearbox attached to the side brush motor. Luckily I managed to pick up a pair of spare assemblies from Fleabay for about £6 each about a year ago but these are no longer available.

So that I can continue to repair my two house mates I am looking for a suppler of just the plastic gears. Having dug them out they seem to be:  primary gear helical 0.5 Mod 42 tooth, intermediate gear pair: helical 0.5 Mod 9 tooth driving Spur gear 0.5 Mod 10 tooth, final drive gear 0.5 Mod 46 tooth. Using those numbers the ratio would seem to be 21:1  :headscratch:  The only other clue is on the gearbox outer is the part number: 0018203 and “RC” and “B2”.

I am assuming they are a standard motor reduction gear set but does anyone have any ideas what else might use them? Or where I could buy some from?

Jo

Owt here ??

https://www.beltingonline.com/gears-racks-leadscrews-366/spur-gears-367/metric-0-5-to-8-mod-375/0-5-mod-spur-gear-514/?zenid=joqvcsckvon2ljm2sptmmgova7

The Hostaform are cheap & strong.  8)

Dunno about the helical wotsit.  :headscratch:  But plastic gears are readily available ( or were ) from Rapid Electronics, CPC, Robotics Sites etc.

Dave

Offline mikemill

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Re: Plastic reduction gear set
« Reply #2 on: June 16, 2020, 09:49:54 AM »
Jo

Try these people, https://www.motionco.co.uk/ I have used them for bevel gears.

Mike

Offline Jasonb

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Re: Plastic reduction gear set
« Reply #3 on: June 16, 2020, 10:14:37 AM »
Could you 3D print them out, should be easy enough to draw in Alibre

Online Jo

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Re: Plastic reduction gear set
« Reply #4 on: June 16, 2020, 10:16:52 AM »
Thanks for those  :)

My suspicions is that this is a set as the centre gear has both gears moulded as a single piece rather than seperate. As the intermediate driver is rather small I am not convinced I would be able to cut off the broken one and attach a replacement  :thinking:

Could I get the resolution needed for such small teeth on my 3D printer  :noidea:

Jo
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Offline Daggers

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Re: Plastic reduction gear set
« Reply #5 on: June 16, 2020, 10:37:36 AM »
Hi,
Have a look at “iRobot Gear Roomba 651” in Thingverse, looks similar.
Daggers

Offline Daggers

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Re: Plastic reduction gear set
« Reply #6 on: June 16, 2020, 10:40:02 AM »
Sorry, Thingiverse, missed the “i”, too early for me.
Daggers

Online Jo

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Re: Plastic reduction gear set
« Reply #7 on: June 16, 2020, 11:04:14 AM »
Thanks Daggers, but both of those gears are standard straight teeth, the larger gear in the pair is helical (teeth at an angle)

Jo
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Offline nj111

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Re: Plastic reduction gear set
« Reply #8 on: June 16, 2020, 01:36:22 PM »
HPC gears in Chesterfield maybe? - not sure how small they go in their standard range but pretty sure I've seen plastic helical there before. Nick
Nick

Online Jo

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Re: Plastic reduction gear set
« Reply #9 on: June 16, 2020, 02:00:57 PM »
 :thinking: The gears are looking more expensive than buying the complete assembly from USA and having it shipped over...

Jo
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Offline Jasonb

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Re: Plastic reduction gear set
« Reply #10 on: June 16, 2020, 02:59:07 PM »
So what are you hoping to power with these motors - turntable to admire your latest castings from all angles leaving both hands free for Snickers? :thinking:

Offline Bluechip

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Re: Plastic reduction gear set
« Reply #11 on: June 16, 2020, 03:44:48 PM »

I have two Eufy robovacs “Sweep” (11) and “Soo” (11s) both have had damaged spur gears in the reduction gearbox attached to the side brush motor.


 :facepalm2:    :D

 

Offline Vixen

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Re: Plastic reduction gear set
« Reply #12 on: June 16, 2020, 03:53:14 PM »
Load, FIRE....take aim   :lolb: :lolb: :lolb:
« Last Edit: June 16, 2020, 03:57:23 PM by Vixen »
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Online Jo

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Re: Plastic reduction gear set
« Reply #13 on: June 16, 2020, 04:33:26 PM »
So what are you hoping to power with these motors

 :headscratch: Sweep and Soo's offside sweeping brush

Jo

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Offline steamer

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Re: Plastic reduction gear set
« Reply #14 on: June 16, 2020, 05:12:03 PM »
Gee I know this woman in the UK who has a mill and a dividing head, and a tool and cutter grinder...and....probably could make those gears...…out of plastic or steel or titanium.......just sayin
"Mister M'Andrew, don't you think steam spoils romance at sea?"
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Online Jo

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Re: Plastic reduction gear set
« Reply #15 on: June 16, 2020, 05:19:03 PM »
You can't cut a 9 or 10 tooth gear with gear cutters  :-\

Jo
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Offline steamer

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Re: Plastic reduction gear set
« Reply #16 on: June 16, 2020, 05:31:33 PM »
You can't cut a 9 or 10 tooth gear with gear cutters  :-\

Jo

cut one with the rack method.....

Dave
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Online Jo

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Re: Plastic reduction gear set
« Reply #17 on: June 16, 2020, 05:35:56 PM »
Its a helical  :noidea:

Jo
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Offline steamer

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Re: Plastic reduction gear set
« Reply #18 on: June 16, 2020, 05:51:41 PM »
http://modelenginenews.org/

Check out the feeny build log.   He makes skew bevel gears, but I see no reason why you couldn't use the same method to cut helical gears based on the results he had with this method....

Dave
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Damned ijjit!

Online Jo

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Re: Plastic reduction gear set
« Reply #19 on: June 16, 2020, 06:22:46 PM »
Putting it in perspective: I can order the electric motor plus reduction gearbox for £16..... I'd like to find a cheap supply of just the gears.

Jo
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Offline steamer

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Re: Plastic reduction gear set
« Reply #20 on: June 16, 2020, 06:27:16 PM »
 8)   I tried...…

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Offline Admiral_dk

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Re: Plastic reduction gear set
« Reply #21 on: June 16, 2020, 09:13:50 PM »
How about 3D printing them  :embarassed:

Online Jo

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Re: Plastic reduction gear set
« Reply #22 on: June 17, 2020, 07:12:40 AM »
I have considered this..... but they must be a stock item I just need to know the magic words for them to pop up on a search :noidea:

Jo
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Offline steamer

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Re: Plastic reduction gear set
« Reply #23 on: June 17, 2020, 01:10:25 PM »
There is the RC car world, but I don't see them in Mod 0.5,      I do see them in 48 DP and 64 DP,   but the price is the same as  your commercial choices..

Dave
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Damned ijjit!

Online Jo

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Re: Plastic reduction gear set
« Reply #24 on: June 17, 2020, 01:23:34 PM »
 :-\ Looks like I will have to order the entire assembly then.

In the meantime I will keep my eyes out they must be used somewhere else  :noidea:

Jo
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Offline Jasonb

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Re: Plastic reduction gear set
« Reply #25 on: June 17, 2020, 01:24:11 PM »
This would be a cheaper option


Online Jo

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Re: Plastic reduction gear set
« Reply #26 on: June 17, 2020, 01:33:28 PM »
Won't work  :disappointed:

Jo
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Offline awake

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Re: Plastic reduction gear set
« Reply #27 on: June 17, 2020, 08:22:35 PM »
Could I get the resolution needed for such small teeth on my 3D printer  :noidea:

Likely to be difficult to get the strength and resolution needed from an FDM printer. If you could get your hands on a resin printer, you might be in business!
Andy

Offline Mike R

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Re: Plastic reduction gear set
« Reply #28 on: June 18, 2020, 03:21:41 AM »

Which gear in particular is damaged?  the small pinion or the larger driven spur or both?  Would you be able to retrofit a metal pinion in place perhaps?

https://hobbyking.com/en_us/hobbykingtm-0-5m-hardened-steel-helicopter-pinion-gear-3-17mm-shaft-10t.html?queryID=83cadb5e650ff3d88450306880cf09d4&objectID=41263&indexName=hbk_live_magento_en_us_products




Offline Pete49

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Re: Plastic reduction gear set
« Reply #29 on: June 18, 2020, 03:38:55 AM »
I would just hire a cleaner. No gears to break and easily replaceable. :ROFL: :lolb:
I used to have a friend.....but the rope broke and he ran away :(

Offline crueby

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Re: Plastic reduction gear set
« Reply #30 on: June 18, 2020, 04:36:22 AM »
I would just hire a cleaner. No gears to break and easily replaceable. :ROFL: :lolb:
Tape the shop elves to the vacuum cleaner, and hang cookies just out of reach in front of them...?

Offline Daggers

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Re: Plastic reduction gear set
« Reply #31 on: June 18, 2020, 02:03:08 PM »
Whilst looking for some metal gears I came across this Spainish based website, dont think its exactly what you require but it has an large interesting selection of plastic gears www.mootio-components.com
Daggers

Online Jo

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Re: Plastic reduction gear set
« Reply #32 on: June 18, 2020, 02:27:06 PM »
That is the best set I have seen so far  :)

Jo
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Online Jo

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Offline Vixen

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Re: Plastic reduction gear set
« Reply #34 on: June 18, 2020, 03:37:07 PM »
I've just found the actual supplier https://www.alibaba.com/product-detail/Large-Diameter-Precision-Plastic-Derlin-Acetal_62260603695.html?spm=a2700.galleryofferlist.0.0.37185f32jtXP0h

Need a shipping quote  :thinking:

Jo

Well done Jo, was that a lucky find or the result of a lot of searching?

Will the MOQ of 100 items be a problem? or does your robovac eat them that quickly?

Mike
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Online Jo

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Re: Plastic reduction gear set
« Reply #35 on: June 18, 2020, 03:57:39 PM »
About one a year, so I will have to live a long time to use them all :lolb:

Jo
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Offline Vixen

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Re: Plastic reduction gear set
« Reply #36 on: June 18, 2020, 04:44:50 PM »
About one a year, so I will have to live a long time to use them all :lolb:

Jo

Mhhhh!!  :thinking: :thinking:

Would the Chinese understand 'a few samples for evaluation, please' ?

Mike
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Offline Jasonb

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Re: Plastic reduction gear set
« Reply #37 on: June 18, 2020, 05:05:19 PM »
There is an option to order a sample, best order it with Surus's e-mail then he will get all the spam that will follow ;)

Online Jo

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Re: Plastic reduction gear set
« Reply #38 on: June 18, 2020, 05:21:44 PM »
I have enquired about the samples ....

Jo
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Offline Don1966

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Re: Plastic reduction gear set
« Reply #39 on: June 18, 2020, 10:29:10 PM »
Awww Jo, a lady with your talent and you let a few little gears get to you. You could make your own cutters as well think of the experience you would get making them........  :stickpoke:



 :cheers:
Don

Online Jo

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Re: Plastic reduction gear set
« Reply #40 on: June 19, 2020, 08:42:53 AM »
Its a moulded gear  ::)

The chinese company have got back to me, even though they list the gear as 10 offs on their website they won't ship under 1000 of them.

Looks like I am forced to buy the entire assembly again  :wallbang:

Jo
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Offline john mills

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Re: Plastic reduction gear set
« Reply #41 on: June 19, 2020, 10:37:58 AM »
Hi  Jo
In this modern world its a wonder you don't have to by a whole new machine your not expected to repair


John

Online Jo

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Re: Plastic reduction gear set
« Reply #42 on: June 19, 2020, 10:55:58 AM »
Very true. One of our other members is a logistics engineer I used to work with he explained that with the frequency of design updates it is not economical to carry spare as there are so many variations of a single design within a year.

In the old days we would do "Line Replaceable Modules" because the guys on the front line did not have the equipment to fault find and the vast quantities of possible spares was too many to make them rapidly available.

The modern way is to make fast and cheap and look to flog the consumer another one the day after the guarantee runs out, the problem is they don't respect that in the EU law under warranty it is required to work for 5 years   :rant:

Jo
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Offline Daggers

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Re: Plastic reduction gear set
« Reply #43 on: June 19, 2020, 11:43:07 AM »
Hi Jo,
just picked up the post requiring you to purchase 1000 min.
I didn’t bother mentioning it when I read you found the original part but I did come across  another  set of files 3D files on thingverse for “Eufy 11s corner brush gear set
www.thingiverse.com/thing:4247963
Worth a look.
Daggers

Online Jo

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Re: Plastic reduction gear set
« Reply #44 on: June 19, 2020, 12:09:07 PM »
 8)

Even worth an attempt at printing  :)

Jo
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Online Jo

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Re: Plastic reduction gear set
« Reply #45 on: June 19, 2020, 01:56:23 PM »
I've just tried printing a set and it looks like they will work... once I reset up the printer  :Doh: and fit the print head cooling fan that I purchased for it months ago  ::)

Jo
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Offline Dave Otto

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Re: Plastic reduction gear set
« Reply #46 on: June 19, 2020, 07:39:44 PM »
I've just tried printing a set and it looks like they will work... once I reset up the printer  :Doh: and fit the print head cooling fan that I purchased for it months ago  ::)

Jo

Do you have CAD? it would be fun run a few on our HP Multi Jet Fusion printer here at work.

Dave

Offline Vixen

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Re: Plastic reduction gear set
« Reply #47 on: June 19, 2020, 08:11:42 PM »
I've just tried printing a set and it looks like they will work... once I reset up the printer  :Doh: and fit the print head cooling fan that I purchased for it months ago  ::)

Jo

Do you have CAD? it would be fun run a few on our HP Multi Jet Fusion printer here at work.

Dave

I don't know what plastic materials Dave can offer with his(?) HP Multi Jet Fusion printer. Maybe Dave has some high strength material available. If not, provided the gear is the correct shape but not strong enough, you could get some printed by www. sculpteo. com or a similar print house, in one of their more exotic reinforced plastic materials

It may be another option

Mike
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Offline Dave Otto

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Re: Plastic reduction gear set
« Reply #48 on: June 19, 2020, 08:42:21 PM »
These would be solid Nylon PA12

Dave

Offline Vixen

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Re: Plastic reduction gear set
« Reply #49 on: June 19, 2020, 08:52:53 PM »
Dave

Sounds like a good strong material to try.

Mike
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Online Jo

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Re: Plastic reduction gear set
« Reply #50 on: June 20, 2020, 06:21:56 AM »
Do you have CAD? it would be fun run a few on our HP Multi Jet Fusion printer here at work.

These are the two stl files for the gears.

Jo
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Offline Jasonb

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Re: Plastic reduction gear set
« Reply #51 on: June 20, 2020, 07:04:35 AM »
Can't see why the first gear could not be made from two pieces soldered together as it has straight cut gears.

Second one does not show any undercut of the pinion so again could have been cut and soldered to the skew gear.

Online Jo

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Re: Plastic reduction gear set
« Reply #52 on: June 20, 2020, 07:12:14 AM »
Everything that has been made can be made again... it is all a case of how much time and effort you want to put into it  ::)

The ex-factory price for each gear is 10p each, the problem is minimum order 1000 plus £30 shipping  :toilet_claw: Last year I purchased two full assemblies, including the electric motors, for £6 each.

Jo
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Offline Dave Otto

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Re: Plastic reduction gear set
« Reply #53 on: June 25, 2020, 12:39:49 AM »
Here is a picture of the printed gears, not sure if they would work or not; they are pretty tiny.
The porous looking surface is only skin deep, under the gray is solid Nylon. This is caused by the transition between the part and powder bed that it is built in.
One thing is for sure I doubt that you would ever have much luck printing them on an FDM machine.

Dave
« Last Edit: June 25, 2020, 12:43:50 AM by Dave Otto »

Online Jo

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Re: Plastic reduction gear set
« Reply #54 on: June 25, 2020, 05:37:35 AM »
They look rather good  :) Much better than I managed on my printer.

Jo
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