Alt-BEAM Archive
Message #03339
To: "'Jason -'" evenflow88@hotmail.com
From: "van Zoelen, Bram SSI-TSEA-352" Bram.A.A.vanZoelen@is.shell.com
Date: Tue, 18 May 1999 10:53:00 +0200
Subject: [alt-beam] Re: gear box(home-made)
How to determine gear ratio
You can use two approached
1 - using the diameter
2 - using the number of tooths.
I will explain the number of tooth methode. The diameter methode will
work in the same way.
Count the tooth of each gear you want to use
Say you have a gear [A} with 12 tooths and one gear [B} with 60 tooths
Statement :
If A drives B then B will turn slower then A.
Why :
For one turn of B there must pass 60 tooth to come
back to the starting point. This means also that A must pass
60 tooth to let B turn one time. But A only has 12 tooth in
one turn. So A must turn 60 / 12 = 5 turns to let B make its
full turn.
Result:
The ratio of this two gears is 5 : 1
Mathematically:
A-Numer of tooths : B-Number of tooths = A-RPM : B-RPM
[RPM -revelations '?? spelling' per minute]
12 : 60 = X : 1
5 = X
Remark:
Gears on the same axe will turn at the same speed. This seems
to be logical but many students seems to forget this.
Remark:
Just repeat the same steps for every gear you add to the
gear train. For example if you add a gear C with 120 tooths
and it will driven by B then the ratio between B and C will
bet 2 : 1. The total reduction og the geartrain will be 10 : 1
Hope this helps
Bram
> ----------
> From: Jason -[SMTP:evenflow88@hotmail.com]
> Reply To: Jason -
> Sent: Tuesday, May 18, 1999 10:23 AM
> To: beam@corp.sgi.com
> Subject: gear box(home-made)
>
> Hie i would like to know who taught u how to make your own gearmotors as i
>
> am having trouble with min cause one of the gears broke in my servo and i
> need to get all the things out and make one myself and how can i determine
>
> or make my own gear ratio....
>
>
> ______________________________________________________
>
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