Scrambler C

[bernard]

[BobaTeaTastesGood]

Bearing questions!

Last year, I made sure to get ABEC-9 rated bearings, but evidently, the ABEC rating system applies to bearings under heavier loads compared to an ETV. The bearings came with a lot of lubricant inside, which slowed down our ETV. I had to remove the lubricant with isopropyl. After 3-4 washes in isopropyl, they appeared to run smoothly under lighter loads, but they would still gunk up over time. I tried using graphite powder lubricant, but that just slowed them down even more.

Anyone know where to get un-lubricated bearings? Are there better strategies for maintaining bearings? Should I be using bearing shields? Thanks, and gl everyone!

[mnoga]

We have typically used mounted bearings from either McMaster-Carr or Servo-City. For scrambler vehicles I'd recommend 4mm or 5mm axles or their imperial measurement equivalents.

[poonda]

Anyone know where to get un-lubricated bearings? Are there better strategies for maintaining bearings?

skateboard bearings have worked decently as well as pretty much every small uxcell bearing you can get from amazon
the small ones dont come with a lot of grease and you can make them run even smoother by soaking them in wd40
also make sure you're not using any glue to secure your axle into your bearing

Should I be using bearing shields?

for the most part i've found it doesn't really matter but it certainly doesn't hurt, most cheap and smaller bearings are shielded anyways

[SixteenthSakura]

Track width....

I am still confused about the track width. I need to figure out if my calculations for the turn need to be further accomadated for width or not....so far I have not read anything about the width only that the terminal barrier will atleast be 1.00 m long

[brian9640]

Track width....

I am still confused about the track width. I need to figure out if my calculations for the turn need to be further accomadated for width or not....so far I have not read anything about the width only that the terminal barrier will atleast be 1.00 m long

There is an FAQ that states the minimum track width of 2.0 m. See link (https://www.soinc.org/there-minimum-or- ... th-track-0).

I would recommend that the vehicles stay within this minimum track width. Some event spaces may not be able to provide space beyond the minimum width. The vehicle's curve should clear the bucket at 8.0m and still stay within the track width at 12.0 meter target distance. Unless a team has an adjustable steering for different distances.

[Ab-1]

I am wondering for the east North Carolina regional tournament, how far is the the terminal barrier going to be from the start point?

[jaspattack]

I am wondering for the east North Carolina regional tournament, how far is the the terminal barrier going to be from the start point?

According to this year's Scrambler rules (5.f.) the Target Distance from the Start Point to the End Point on the Terminal Barrier will be anywhere between 8.00 m and 12.00 m in 0.50 m intervals for Regional competitions. The exact Target Distance is announced by the Event Supervisor after the impound period is over, it's not announced in advance of the competition.

[newflight]

regarding to rule 3.b: in the ready-to-run configuration, must completely fit within an imaginary rectangular box with 100cm x 50 cm base and a 100cm height. How to interpret it? As long as the entire srambler including everything fit into the 100 x 50 x100, no matter which orientation the entire scrambler is pointing to since I have to tilt the scramber frame to aim to the right direction, it will be fine? for example, with 0 angle, the entire scrambler fits into the 100 x 50, after tilting 30 degrees, part of the frame edge is outside of the original 100 x 50 base; after tilting, do I just use a new imaginary 100 x 50 with the new orientation?

[Nydauron]

regarding to rule 3.b: in the ready-to-run configuration, must completely fit within an imaginary rectangular box with 100cm x 50 cm base and a 100cm height. How to interpret it? As long as the entire srambler including everything fit into the 100 x 50 x100, no matter which orientation the entire scrambler is pointing to since I have to tilt the scramber frame to aim to the right direction, it will be fine?

If I were running the event, I'd agree and allow the imaginary box to be rotated along the yaw axis (left to right). Back when MTV was an event, the ES allowed us to rotate the box to fit our vehicle (it just so happened that our wheels for their entirety) exceeded one length of the square box, but it fit if the car was placed on a center diagonal).

There are some trade-offs, like the ratio between the max width and height of the car/launcher changing depending on how much you rotate the imaginary box, but if your RtR config fits in the box (with a rotated yaw or not), I'd be happy with that. This is also typically why I (and recommend ESes to) bring a rigid frame (e.g., zip-tied meter/half-meter sticks, 1x2 wooden frame, PVC pipe frame), which can be slipped over the RtR configuration in case I need to verify specs.

for example, with 0 angle, the entire scrambler fits into the 100 x 50, after tilting 30 degrees, part of the frame edge is outside of the original 100 x 50 base; after tilting, do I just use a new imaginary 100 x 50 with the new orientation?

Given that this year involves the curve, this interpretation still applies in your favor (e.g., the box can rotate on the yaw axis with the RtR configuration of the launcher/vehicle and the imaginary box having a relative yaw of 0 degrees). I would imagine pretty much all ESes should allow this.