Sprockets and Chains

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CoggesRailway

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Hello All,

So I am thinking of a project that will involved a RC Car motor (good quality beefy thing out of a bits box at the model shop) .

If I want a sensible speed (slowish) for my railway, how much do I need to reduce it by. So depending if its a worm and gear or a chain drive- how much bigger should the drive gear on the axle be than on the motor output ??

Afraid I can't give more detail than this right now. I can see the bits I need online but not sure about ratios.

Ian
 
Your R/C car motor may well be a high speed Mabuchi type motor , they go by sizes 380 and 540 .
They are generally , by necessity , very high speed , so if you really mean to proceed , you may need a lot of gearing down .
This in itself is a bit fraught , mounting the gears effectively and solidly enough can turn into a real problem .
The rule gearing down chain is simple , number of teeth per cog , say 24 teeth to 12 teeth either gives a down speed of 2/1 or an upspeed of 1/2 .
Worm and wheel are generally bought as a particular ratio like a 20:1 .
I hope you find a way to use your motor , but the r/c car ones are a bit vicious .
The same size motor called a "Truck Puller" is for r/c trucks (really?) which tend toward the more sedate .
"MOTION.CO" are very good with their range of chain and worm gears

best of luck ,

Mike M
 
Thanks mate, I think that sounds good advice. It's just a bought it for almost nothing and would like to find a use for it. but as you say it may be very tricky to try and get a successful drive onto the right axle, and for it to be smooth and reliable, all combined with my fairly crude skills!

I have been looking on ebay and there are motors used for all sorts of things available with the gearbox already in place, and for not much money at all.... so maybe I will have to save the motor for my propeller powered train-plane idea !
 
Hi Ian
The 24v Pittman motors that include gearing are really robust (Accucraft use them in their brass locos and in fact Bachmann used them for some of their 1:20.3 kit).
Their gearing (depending on age of loco) 1:19, 1:30, 1:64. The last ratio goes quite sedately but gives the loco a good low down grunt (I like that for me hills).
The 1:19 has not enough torque and my old Accucraft C16, with this ratio, finds my inclines or a decent length train on the flat, decidedly hard for itself.
 
CoggesRailway said:
Thanks mate, I think that sounds good advice. It's just a bought it for almost nothing and would like to find a use for it. but as you say it may be very tricky to try and get a successful drive onto the right axle, and for it to be smooth and reliable, all combined with my fairly crude skills!

I have been looking on ebay and there are motors used for all sorts of things available with the gearbox already in place, and for not much money at all.... so maybe I will have to save the motor for my propeller powered train-plane idea !
Click to expand...

Ian , there are some very good readily available motors with gearheads fitted .
A minor problem with some of the cheaper ones which are mechanically ideal is the noise they make .
The quieter ones are worm and wheel ; the spur gear ones can be a bit rowdy----depends on what you pay (as usual) .
For example , a quick look at Slaters motor/gearbox things may frighten you off forever , but they really are superb and almost noiseless . That's the Rolls-Royce end of the market .
At the other end are the Hobbies open gearbox type----they are effective but noisy . Entertain yourself by cruising around the net , don't be in a hurry to buy , and you may find something that drops neatly into your model .
Enjoy researching .

mike m
 
CoggesRailway said:
Thanks mate, I think that sounds good advice. It's just a bought it for almost nothing and would like to find a use for it. but as you say it may be very tricky to try and get a successful drive onto the right axle, and for it to be smooth and reliable, all combined with my fairly crude skills!

I have been looking on ebay and there are motors used for all sorts of things available with the gearbox already in place, and for not much money at all.... so maybe I will have to save the motor for my propeller powered train-plane idea !
Click to expand...

You could also build a Snow Blower with it, just the job for thise light fluffy Snow Days. Why would I think about that at this time of the Year? Just longing for a cool snowy night to get some sleep!
JonD
 
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