Plastic reduction gear set

[Jo]

You can't cut a 9 or 10 tooth gear with gear cutters 

Jo

[steamer]

You can't cut a 9 or 10 tooth gear with gear cutters 

Jo

cut one with the rack method.....

Dave

[Jo]

Its a helical 

Jo

[steamer]

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

[Jo]

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

[steamer]

    I tried...…

[Admiral_dk]

How about 3D printing them 

[Jo]

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

Jo

[steamer]

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

[Jo]

  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 

Jo

[Jasonb]

This would be a cheaper option

[Jo]

Won't work 

Jo

[awake]

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

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!

[Mike R]

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

[Pete49]

I would just hire a cleaner. No gears to break and easily replaceable.