If you have your tracks (which it sounds like you do) your sprocket design is done for you. All you have to decide is how many teeth/how big you want the sprocket - bear in mind that the two are directly related as your tooth size is already determined by the track. How big is the gap between track pads?
For my M113 I designed and built the tracks, then extrapolated the sprocket from that, and drew them both to make sure I hadn't missed the mark, including 2mm of "give" in the space for the track pad to sit in the sprocket. See this animation that I made to test the engagement: http://www.youtube.com/watch?v=82Sjeyl5LxE From: [email protected] [mailto:[email protected]] On Behalf Of ROCHFORD NEIL Sent: Friday, 18 February 2011 8:29 PM To: [email protected] Subject: Re: FW: [TANKS] cad drawing help required This is a sketch i made showing roughly what I want to build and also shows why I cant simply print it out and cut round it , its bigger than A4 paper. I have a new idea that follows one of Dave Mansons tutorials, (the 2/5 Sherman fella). What i do want from the group is what shape tooth design would work best for the track pad shown at the top of the drawing , The track pad is comprised of a 1mm thick X 76mm steel plate then 3mm treadmill belt then 18mm thick X 76mm ply pad. the Faint inner circle inside the octagon is 203mm in Diameter. the angle of the tooth is about 60 degrees from each flat edge of the octagon. each tooth has a 30mm base and a 15mm top edge. Im now thinking these teeth could be a little small allowing them to jump out of the pad slots when forced. I dont really know. I know that the track pads are a little on the wide side at 3" but that was the size the 1mm steel plates are manufactured, so i was stuck with it. I hope my file format is universal Neil R On 18 February 2011 00:16, Ben Holko <[email protected]<mailto:[email protected]>> wrote: If you know the dimensions of your track, sprocket drawing is easy. Is your sketch more about how the sprocket looks, or is it supposed to be measurement based for tooth design? Tooth design is determined largely by your track and track pad dimensions. Ben ________________________________________ From: [email protected]<mailto:[email protected]> [[email protected]<mailto:[email protected]>] on behalf of neroc [[email protected]<mailto:[email protected]>] Sent: Friday, February 18, 2011 3:48 AM To: R/C Tank Combat Subject: Re: FW: [TANKS] cad drawing help required Thank you gentlemen . Pete I may be able to achieve what i want with that program but I want a sprocket not a cog. , I`ll draw and scan a sketch to show what I intend to do with this sprocket. I dont want to mess up this part of the build, I built my suspension arms without any advice and Im not all together happy with them. Scott I`ll post my sketch asap if you can redraw it so it is perfect, I`ll be very happy. Once i have a perfectly symmetrical drawing of the sprocket I plan to make a master out of plywood and from that make a mold. if this goes to plan I will be able to make many sprockets out of fiberglass. as they wear out I`ll make new ones. thanks everyone Neil R -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected]<mailto:[email protected]> To unsubscribe, send email to [email protected]<mailto:rctankcombat%[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]<mailto:[email protected]> To unsubscribe, send email to [email protected]<mailto:rctankcombat%[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]<mailto:[email protected]> To unsubscribe, send email to [email protected]<mailto:[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
