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Plastic Contrate Gears
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boustrophedon


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Joined: 06 Jun 2015
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PostPosted: Thu Jun 08, 2017 7:35 am    Post subject: Reply with quote

A Meccano pinion mating with a large Meccano contrate wheel is quieter than using a pair of Meccano bevel gears as the contrate gears are actually made with better shaped gear teeth than the bevel gears, where the machining was a bit iffy to say the least.

Good engineering practice would suggest otherwise, but having said that large contrate wheels can be found in many windmills and water mills transmitting lots of power.
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lawrie


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PostPosted: Thu Jun 08, 2017 10:30 am    Post subject: Reply with quote

I have a large contrate gear  and pinions so I will give it a go.

May make it too fast or too slow depending how I fix it

Thanks
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lawrie


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PostPosted: Fri Jun 09, 2017 9:42 am    Post subject: Reply with quote

Hi
Have tested all three ways to drive at right angles and made short videos.

The third video is using an idea in a previous post  Only a makeshift setup here.

The noise is a drill driving the test.  All videos have drill flat out but still less revs than the wilesco when it runs the setup.






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Wallace


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Joined: 19 Jul 2006
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PostPosted: Sun Jun 25, 2017 10:00 am    Post subject: Reply with quote

Hi Lawrie.

I couldn't believe the noise difference I overlooked the fact you were using a drill and actually thought you were using an engine to drive it and was going to say the sound is most likely the engine

I have been mucking around with some meccano today and was trying some different setups. I can't help but think the ply is amplifying the sound..... or whatever the technical term is. Basically amplifying it/acting like a speaker type situation.
Perhaps a some form of dampener between the brackets and the walls would help. Inner tube cut out might work.

A fair while ago I made a similar setup on MDF. I can't recall it ever being that noisy. I hate MDF so moved it to ply and recall it was a bit louder. The video is on photobucket so unfortunately I can't give a link or even watch it anymore.
Worth a try. Or place some grease like what is used in RC gearboxes on the gears as a starter.

How is it coming along?
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lawrie


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PostPosted: Sun Jun 25, 2017 1:52 pm    Post subject: Reply with quote

Hi Wallace,
I think you are right about the sound with ply. I had planned mdf but it is not nearly as versatile. Good idea about the grease, I have heard graphite grease is good.
I have a few rubber washers and will them as dampers.  Never thought of that😀
As to progress, I spent a lot of time trying to glue cord that did not want to glue...bought some nitrile cord and it works.
Not much time the past couple of weeks. Today made a bracket to help drive a flexible grinder from above.
Once it works from steam I will dismantle for painting etc😀
Thanks for the advice👍
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Wallace


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PostPosted: Fri Jun 30, 2017 6:01 am    Post subject: Reply with quote

Good luck with it Lawrie
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