RE: Transmission Basics [TANKS]

[Jeremy Caylor <jeremyandcurt-at-yahoo.com>]

I've got another question. Would #35 pitch chain and gears hold up? Or should I opt for #40 pitch. I would like the #35 to work because its alot easier to find the gears in smaller bore dia. Thanks again....

Steve Tyng <STyng-at-acptrust.com> wrote:
> Francisco wrote:
>
> > First are these, the same as (or close to) EVs.
> > http://www.surpluscenter.com/item.asp?UID=2006020117595767&ite
> > m=10-1646&catname=electric
>
> We call those EVX's. They are slightly less powerful than the EV
> Warriors. They have been successfully used in paintball tanks. 
>
> > I have changed directions and I'm now going for a Churchill 
> > Mk VI
>
> Cool tank but narrow for it's size. Getting everything into it could be
> challenging.
>
> > I am planing on 
> > using Plastic Conveyor Tracks like the Hetzer so I will need 
> > a
>  belt somwhere in the setup for slippage right?
>
> Usually but I don't recall the Hetzer having any belts. It may be
> relying on the slip clutches in the drill motors it is using. You
> should consider the attachment chain tracks for a Churchill. It most
> closely resembles the WWI style tracks the Churchill used. It would
> look cool.
>
> > If I do a 9 to 1, I will need a 10 tooth and a 30 tooth plus 
> > two identical cogs/wheels for the belts right?
>
> Not sure what your describing. If you want the 9:1 both stages will
> have to have a 3:1 reduction. There's no set rules on the reduction
> ratio. The 9:1 works well when used with 2000rpm drive motors. Before
> you buy any sprockets or pulleys you should layout your hull design in
> scale and determine the space available for the transmission sprockets,
> particularly the second stage because the space is the tightest at the
> drive shaft. You usually have a max sprocket size you can fit on the
> drive
>  shaft so your limited on your reduction ratio on the second stage.
> You adjust your overall reduction ratio by playing with the ratio on the
> first stage. For example, I was able to fit a maximum size of a 28
> tooth sprocket on the Cromwell drive wheel. It is being driven by an 11
> tooth sprocket which gives a 2.55:1 reduction on the second stage. If I
> wanted to set over all reduction to 9:1 I would design the first stage
> to a 3.53:1 ratio.
>
> > On the topic of belts what type of belts are used and
> > where can I get them?
>
> I use linked belts and get them from McMaster.com.
>
> > On too batteries, what do the veterns recommed 12 volt or 24 
> > volt batteries? 
>
> Depends on your motors and the design speed your going for. The EVX's
> are optimized for 12volts. For your first tank I would stick with
> 12volts.
>
> > How many? What type, sealed gel batteries, right?
>
> How many depends on voltage. What your really interested
>  in is amphr
> capacity. Look for 24amphr or more for a 12volt system.
>
> > What other things do I need to look for when getting batteries? and
> what 
> > type of charger?
>
> I recommend a smart charger. Avoid cheap automotive battery chargers.
>
> > Last but not least what do I need to know about bearings?
>
> In order of preference (and cost): sealed ball bearings, bronze
> bushings, plastic bushings.
>
> > Thanks for the help everyone,
> > Francisco "Starting over again" Arias, Florida 
>
> Where in Florida are you? I'm usually in the Orlando area a couple
> times a year.
>
>
>
> Steve Tyng

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