I think I speak for a few when I say I have always been interested in what you are doing with small tanks and would love to see this set-up explained by someone other than a guy looking to sell it.
Tom On Tuesday, May 18, 2010, at 06:23AM, "George Mastoras" <[email protected]> wrote: >Hey all, long time no post. >Just noticed this D drive and I just happen to have started on a triple diff >transmission using planetary gears for my big tank >There are so many similarities with the D drive and a modern triple diff >tank transmission. >What this guy has done is modify the steering diff to become a drive diff. >The smaller motor to change the ratio is the motor that would steer the tank >and give it reverse. It works exactly the same. > >When I saw this I understood it because I have been toying for a few months >and have already started buying the gears etc. > >The difference is in the D drive the main motor is permanently running at >optimum speed and the smaller motor changes the gear ratio to the point of >also giving it reverse. >In a tank the main motor has a variable speed and the steering has also so >when combined you can mix between the two to get speed and steering. > >Still early days for pics but if there is any interest in this project I >will put some up. > >I have built many vehicles and its become clear that a 3 diff setup is what >I have been looking for, its a beautiful thing but not required for paint >ball at all, having said that I do expect to have a lot more control at high >speeds compared to a skid steer tank, will be interesting. > > >George > > > >On 17/5/10 2:13 AM, "Clark Ward Jr" <[email protected]> wrote: > >> Thanks Bill, your drill-press example cleared it up for me quite a bit :) >> >> On Sun, May 16, 2010 at 11:38 AM, Bill Hamilton <[email protected]> wrote: >>> A cone-and-belt cvt works like the pulley stacks in a drill press drive. >>> Only, instead of two sets of pulleys, you have two cones and a mechanism to >>> keep the belt taut on those cones. Move the belt one way and you get more >>> torque, less speed. Move it the other, you get more speed, less torque. >>> >>> -Bill Hamilton >>> >>> On May 16, 2010, at 9:34 AM, Clark Ward Jr <[email protected]> wrote: >>> >>>> Thanks, my Bosch blue book doesn't have a lot of detail on how exactly >>>> a CVT works, only something about a band that moves between two >>>> cones.... I will find a book that explains it someday. But I agree, >>>> anytime someone claims an 'order of magnitude' efficiency improvement, >>>> it's time to be skeptical. >>>> >>>> On Sun, May 16, 2010 at 7:40 AM, Ben Holko <[email protected]> wrote: >>>>> >>>>> A CVT should not slip, if it does it has too much torque put through it. >>>>> A 'la it WILL slip if you put more torque through than it can handle. >>>>> Having >>>>> said that, there is friction there which is what is stopping it from >>>>> slipping, while this geared approach has (basically) no friction. Think of >>>>> it like the gears of a manual gearbox, with the variability of a CVT. >>>>> >>>>> Ben >>>>> >>>>> >>>>> -----Original Message----- >>>>> From: [email protected] >>>>> [mailto:[email protected]] On Behalf Of Clark Ward Jr >>>>> Sent: Sunday, 16 May 2010 9:26 PM >>>>> To: [email protected] >>>>> Subject: Re: [TANKS] Absolute genius >>>>> >>>>> Aren't CVTs less efficient than geared transmissions, given that they are >>>>> slipping the whole time? Or do I misunderstand the technology vis-a-vis >>>>> the >>>>> slipping belt and the cones of a CVT? >>>>> >>>>> On Sat, May 15, 2010 at 10:26 PM, Don Shankin <[email protected]> wrote: >>>>>> >>>>>> >>>>>> On Sat, May 15, 2010 at 7:19 PM, Ben Holko <[email protected]> wrote: >>>>>>> >>>>>>> http://www.youtube.com/watch?v=F6zE__J0YIU >>>>>>> >>>>>>> >>>>>>> >>>>>>> This thing may revolutionize all transmissions. >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>>>>> 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 >>>>>> >>>>>> >>>>>> Nice concept. I'm glad they addressed my concern of having to power >>>>>> the second shaft. I was on board until he said he estimated it to be >>>>>> an _order of magnitude_ more efficient than the current CVT >>>>>> transmissions (not geared transmissions, but CVTs even!). We'll see >>>>>> where this ends up when you figure in powering that second shaft. I'm >>>>>> guessing (with no facts or numbers whatsoever) that it will be on par >>>>>> with losses associated with a torque converter (which may be OK >>>>>> because at the end of the day this thing is still a high-torque CVT). >>>>>> >>>>>> -Don "I'm a computer engineer not a mechanical engineer" Shankin >>>>>> >>>>>> -- >>>>>> 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 >>>>> >>>>> >>>>> >>>>> -- >>>>> 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 >>>> >>>> >>>> >>>> -- >>>> 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 >> >> > > >-- >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
