February 13, 201411 yr Yea it turned out faster than the original 9398, But the lack of torque made it stall on the smallest of hills.
February 13, 201411 yr Author Yea it turned out faster than the original 9398, But the lack of torque made it stall on the smallest of hills. Theoretically, mine is geared 1:33.45 I think and should still manage 540rpm (that is including a 10% speed loss due to friction). So it is about as fast as a buggy motor geared 1:2 and might have more torque...
February 14, 201411 yr Recently, i also made similar experiment like you to make LEGO motor. i have made a Technic cross axle coupler and bracket on general DC Motor. Then, the motor can be connected with other LEGO Technic parts. Also, due to the motor speed very high (low torque), so i created a gear box to gearing down to increase torque, and used on Technic set 9396 Helicopter for testing.
February 14, 201411 yr Author That's a really good experiment you conducted there! It seems to work very well! Did you come across any issues I should take note of? Edited February 14, 201411 yr by MrNumbskull13
February 16, 201411 yr That's a really good experiment you conducted there! It seems to work very well! Did you come across any issues I should take note of? when my copper tubing glue with cross axle extension connector using Epoxy, need to very accurate vertical, otherwise the motor will not smooth (friction between the motor axle and beam hole)
February 16, 201411 yr Could always double up on the gears like this tamiya gearbox to spread the load. Does that motor have enough power for flight?, because its looks like it to me. :D
February 16, 201411 yr Author Could always double up on the gears like this tamiya gearbox to spread the load. Does that motor have enough power for flight?, because its looks like it to me. :D I thought about doing that before but it would also double the friction, which would slow down the motor. I hope my trophy truck will be flying over the bumps. xD
February 16, 201411 yr When using a third party motor, why not a size 540 or 380 of rc cars? Edited February 16, 201411 yr by efferman
February 16, 201411 yr Author When using a third party motor, why not a size 540 or 380 of rc cars? I have a truggy with a 540 motor, it's really fast but I think it would destroy lego. Maybe I'll try a 380 after this, thanks. (I wasn't sure what size was smaller than 540) Also, does anyone know how to calculate the torque of a motor? (Preferably in mNm)
February 16, 201411 yr The 540 are not all brushless, or for racing a standard mabuchi 540 costs roundabout 5 euros and shouldnt have to much torque
February 16, 201411 yr Author Mine isn't brushless either, I've seen the exact motor for about £10, maybe I'll get one after I test out this. :)
February 17, 201411 yr Theoretically, mine is geared 1:33.45 I think and should still manage 540rpm (that is including a 10% speed loss due to friction). So it is about as fast as a buggy motor geared 1:2 and might have more torque... Sounds Great! The motor that I used with the 9398 crawler has a 5 pole armature which it has good amount of torque behind it. Tho, the motor max rpm is around 8000 at 12volts. The rpm on the wheels was around 400 with a decent amount of acceleration to reach the top speed with the crawler but the thermal fuse inside the V2 receiver would cause speed hiccups on the motor around 5 minutes of use. When using a third party motor, why not a size 540 or 380 of rc cars? It just depends if the motor can surpass the Buggy motor with standard Lego gearing.
February 17, 201411 yr Author Ok I tried to figure out how much torque I could produce but the results were terrible as I don't know how to find the efficiency of a motor.... The metal connector should also be made soon...
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