Re: [TANKS] Absolute genius
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 ki4...@gmail.com 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 billw...@gmail.com 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 ki4...@gmail.com 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 b...@holnet.net 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: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Clark Ward Jr Sent: Sunday, 16 May 2010 9:26 PM To: rctankcombat@googlegroups.com 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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group
Re: [TANKS] Absolute genius
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 id...@optusnet.com.au 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 ki4...@gmail.com 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 billw...@gmail.com 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 ki4...@gmail.com 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 b...@holnet.net 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: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Clark Ward Jr Sent: Sunday, 16 May 2010 9:26 PM To: rctankcombat@googlegroups.com 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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr
RE: [TANKS] Absolute genius
Definitely interested in seeing some pics! -Original Message- From: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of George Mastoras Sent: Tuesday, 18 May 2010 8:24 PM To: rctankcombat@googlegroups.com Subject: Re: [TANKS] Absolute genius 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 ki4...@gmail.com 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 billw...@gmail.com 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 ki4...@gmail.com 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 b...@holnet.net 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: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Clark Ward Jr Sent: Sunday, 16 May 2010 9:26 PM To: rctankcombat@googlegroups.com 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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email
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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
RE: [TANKS] Absolute genius
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: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Clark Ward Jr Sent: Sunday, 16 May 2010 9:26 PM To: rctankcombat@googlegroups.com 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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
Re: [TANKS] Absolute genius
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 b...@holnet.net 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: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Clark Ward Jr Sent: Sunday, 16 May 2010 9:26 PM To: rctankcombat@googlegroups.com 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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
Re: [TANKS] Absolute genius
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 ki4...@gmail.com 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 b...@holnet.net 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: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Clark Ward Jr Sent: Sunday, 16 May 2010 9:26 PM To: rctankcombat@googlegroups.com 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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat- unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat- unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
Re: [TANKS] Absolute genius
In a message dated 5/16/2010 11:39:16 A.M. Eastern Daylight Time, billw...@gmail.com writes: 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 or like a snowmobile Chris, _Odyssey Slipways_ (http://hometown.aol.com/odysseyslipways/index.html) -- You are currently subscribed to the R/C Tank Combat group. To post a message, send email to rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
Re: [TANKS] Absolute genius
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 billw...@gmail.com 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 ki4...@gmail.com 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 b...@holnet.net 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: rctankcombat@googlegroups.com [mailto:rctankcom...@googlegroups.com] On Behalf Of Clark Ward Jr Sent: Sunday, 16 May 2010 9:26 PM To: rctankcombat@googlegroups.com 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 dshan...@gmail.com wrote: On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
Re: [TANKS] Absolute genius
On Sat, May 15, 2010 at 7:19 PM, Ben Holko b...@holnet.net 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com 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 rctankcombat@googlegroups.com To unsubscribe, send email to rctankcombat-unsubscr...@googlegroups.com Visit the group at http://groups.google.com/group/rctankcombat
