Timeline for Can I build a faster LEGO train motor?
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Jul 10, 2015 at 13:58 | comment | added | user2813274 | The PF XL motor is a bad choice for a direct RPM comparison, as it's more built for axle-bending torque instead of pure speed (yes, you can use gears to change the two, but you aren't doing so in your comparison) - a faster motor such as the 2838 (old, 9v motor) reaches 4k RPM, the buggy motor reaches 1700 RPM, which is much more in-line with the 2k RPM of the train motors themselves. Even the E-motor is close to 800 RPM and makes more sense in a comparison if you want a fast motor RPM. | |
| Nov 6, 2014 at 16:32 | comment | added | user4139 | The stalling torque on an XL PF motor is 40 N.cm so to get 10x the speed, it would be 1/10 the torque, or 4 N.cm, or 0.04 Nm. Without knowing the mass of the wheel its hard to go further with those calculations though. In a perfectly efficient frictionless world of course. | |
| Oct 31, 2014 at 7:40 | comment | added | Stephane Delcroix | if someone want to check the computation, or play with variables: wolframalpha.com/input/… | |
| Oct 31, 2014 at 0:17 | comment | added | Nick2253 | While that may be "smooth" from our perspective, that is incredibly tough from the trains perspective. The gaps and angles there are simply unacceptable for a train moving at 10 mph | |
| Oct 31, 2014 at 0:07 | comment | added | Taylor Garrett | Thank you for your answer. I already have the curve radius problem that you speak of completely eliminated using this technique: holgermatthes.de/bricks/en/smooth-curves.php. | |
| Oct 30, 2014 at 23:03 | history | edited | Nick2253 | CC BY-SA 3.0 |
added 4 characters in body
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| Oct 30, 2014 at 16:41 | history | answered | Nick2253 | CC BY-SA 3.0 |