305LikesXray X1 - Formula One Car
03-19-2018, 01:36 PM
#2476
Tech Apprentice
03-19-2018, 07:37 PM
#2477
This is just flat wrong
For example, you can get an 80 tooth spur in either pitch, and would therefore run the same pinion on either gear, just different pitch
Gear ratio = spur/pinion
so if 64p is 100/40 lets say, = 2.5
the 48p spur you're trying to match is say, 90T 48P
90/2.5=36 - you run a 36 tooth pinion to get the same ratio
(40*.75=30 you would be 6 teeth off in this case)
All we mean by gear ratio is how many motor rotations it takes for one rotation of the spur gear, you have to spin a 40 tooth pinion 2.5 times to rotate a 100 tooth spur gear one time
For example, you can get an 80 tooth spur in either pitch, and would therefore run the same pinion on either gear, just different pitch
Gear ratio = spur/pinion
so if 64p is 100/40 lets say, = 2.5
the 48p spur you're trying to match is say, 90T 48P
90/2.5=36 - you run a 36 tooth pinion to get the same ratio
(40*.75=30 you would be 6 teeth off in this case)
All we mean by gear ratio is how many motor rotations it takes for one rotation of the spur gear, you have to spin a 40 tooth pinion 2.5 times to rotate a 100 tooth spur gear one time
OD=(N+2)/DP N = number of teeth DP = Diametral Pitch
80t 48p (80+2)/48 = 1.708"
80t 64p (80+2)/64 = 1.281"
You can check the conversion ratios here to see he was correct, 1.708*.75 and 1.281*1.333.
To find the eq of a gear you have in your hand, measure the OD, multiply by the pitch you want to switch to, and subtract 2.
Example, that 80t 48 pitch to a 64p is (1.708"*64)-2 = 107.31
So you would go by a 108 and then use ratio math to find the pinion you want.
03-21-2018, 05:34 PM
#2485
See what the fast guys run at your track. Different tracks favor different tires. I've tried a lot of tires but keep going back to the Shimizu 571/572 (Tamiya TCS tires, CRC tires) These worked well at our old asphalt track.
03-21-2018, 08:47 PM
#2486
03-22-2018, 10:58 AM
#2487
I noticed previous PO had 1mm shims under the lower arms, and kit calls for 2 mm. so I changed that out as well. Hopefully I can get some time in the next few weeks to take the car out.
03-27-2018, 04:47 AM
#2488
Tech Rookie
F1 2017 chassis
Has anyone tried the 2mm (narrow) chassis on asphalt? Trying to figure out why no one (or team drivers) is using it on asphalt with rubber tires.
Last edited by XrayAllDay1; 03-27-2018 at 05:10 AM.
03-27-2018, 05:25 AM
#2489
Tech Rookie
Make sure
If you swap out gears or adjust the rear pod reset the gear mesh. If you adjust, loosen any rear pod screws reset the mesh. Also, make sure the ride height cups match and installed correctly. Sounds like common sense but sometimes that's the cause.
Just finished my 2018 x1 build. Tried it out at the track and spur is a little chewed up. I know how to set the mesh properly. Just wondering if anyone knows what causes it? and if there's another brand of spur that will work? since nobody here in the US has xray spurs in stock.
03-28-2018, 05:18 PM
#2490
I think most outdoor setups are on the standard graphite chassis.
with more lube on the sides, stiffer springs and the right track width and inline setup on the battery you should be good to go. tires of course make a difference too.