Although I hand drew my sprockets, there was some basic calculations involved in finding out the size and correct teeth before starting to draw. First, I set a maximum sprocket diameter that would let the tracks stay clear of the upper hull. Lets say 4". The I figured the circumference, 4" x 3.16 = 12.64", or about 12 5/8" (12.625"). Second, I took one track pad width (1") and added a 1/4" (the thickness of one sprocket tooth) to get a 1.25" figure. I divided 12.625 by 1.25 to get 10.1, or 10 teeth for about a 4" diameter sprocket. Lastly, I nail down the actual diameter by taking 10, multiplying by 1.25, then dividing by 3.16 to get 3.95" (3 15/16")
Knowing the diameter (3.955") and the number of teeth (10), you should be able to put those numbers into that online sprocket generator and get a basic sprocket. If you have to use pitch, use 1.25". The Spartan's sprocket teeth is slightly less than 1/4" thick. I'm sure one of the CAD guys could make a sprocket in no time flat versus the 5 drawings it took me to get something usable. heh. Mike PS The Spartan videos are posted on the second and third page of the SV-15 pages in RC Tank Combat web site. ________________________________ From: Clark Ward Jr <[email protected]> To: [email protected] Sent: Tue, January 19, 2010 6:53:26 PM Subject: Re: [TANKS] Re: I got inspired In fact I got inspired enough to work on my least-favorite (and therefore slowest) part... assembling the tracks! That and actually generating the drive sprockets. I looked at Mike's, which are glorious and awesome, but I can't get the online sprocket generator to make one with skinny enough teeth and wide enough valleys (very technical terms, to be sure!). Anyone have suggestions on the sprocket problem? (This is for TTS with sprocket drive) -- Clark in Georgia -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat
-- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat
