01-27-2014 11:37 PM

Gregor

Re: pic: Diamond Wheels after 10 minutes

Wow, that's concerning.

Were you running them on carpet?

01-27-2014 11:41 PM

Thad House

Re: pic: Diamond Wheels after 10 minutes

Yeah that was on carpet. It was the carpet in the school, which is pretty similar to the competition carpet.

01-27-2014 11:49 PM

s_forbes

Re: pic: Diamond Wheels after 10 minutes

How much does your current robot weigh? What gear ratio?

A light drivetrain will tend to 'burn out' the wheels on carpet when starting from a stand still or changing direction. This is not so much the case when it's weighed down with mechanisms and bumpers. If you are using a low gear ratio (by which I mean: slow top speed) and lots of power (you mentioned 3 CIM gearboxes) the effect is more noticeable... I suspect that slipping the wheels on carpet would give the accelerated wear you're seeing.

01-27-2014 11:49 PM

BurkeHalderman

Re: pic: Diamond Wheels after 10 minutes

Can you describe your drivetrain setup? what kind of weight were you testing with? This is pretty concerning, we just ordered a few sets and were hoping they would be better than the original Versawheels we used last year, which wore to almost nothing after 10 matches.

01-27-2014 11:56 PM

Thad House

Re: pic: Diamond Wheels after 10 minutes

Its a 6WD WCD, but currently only the center wheel is driven. Its geared to about 10.5 FPS, and weighs 75 lbs. We did notice it was slipping, only if we went full forward and full back, which we didnt do too often.

01-27-2014 11:59 PM

Aren_Hill

Re: pic: Diamond Wheels after 10 minutes

I can respond with "that's not a lot"

Even after the nubs are gone there is still a significant amount of tread before you hit plastic.

We had 973 run them at an offseason competition and practice and estimate around 2 regionals of use out of a set including some practice.

These were designed to be a more consistent grip level for the entire life of the wheel and last longer than the other 4" VersaWheels with W tread (depending how often you spin your wheels).

They aren't meant to last forever though, as we still wanted a decent level of grip.

-Aren

01-28-2014 01:03 AM

AdamHeard

Re: pic: Diamond Wheels after 10 minutes

Yeah, we were very happy with them.

01-28-2014 08:56 AM

JamesCH95

Re: pic: Diamond Wheels after 10 minutes

Wait wait wait... you're using a 6-cim 2WD setup, geared relatively low, on a very light robot?

You're hilariously inside the 'traction limited' operational regime and I would wager a large sum of money that you're spinning wheels WAY more than you think you are.

See this drivetrain chart: http://team358.org/files/mechanical/...nRefTables.jpg

You're robot is 50% of the weight of a fully-loaded FRC robot (in round numbers), and thus has less than 50% of the assumed weight (148lbs) on its driven wheels. With a 4-cim drive you're well within the 'safe' i.e. 'traction limited' case. With 6 cims you're just begging to spin and roast wheels.

01-28-2014 09:32 AM

nuttle

Re: pic: Diamond Wheels after 10 minutes

This is probably also a factor, half the weight is on non-driven wheels. You should address this before you do much more driving.

01-28-2014 01:21 PM

Thad House

Re: pic: Diamond Wheels after 10 minutes

Yeah we plan on chaining the rest up when we get actually get the sprockets. Maybe it was spinning more then I thought they were. I guess I'm just used to the AM wheels, were you can spin them for days and they don't wear much at all. Nobody on our team has every used anything but the AM kit wheels, whether it was the old or new style.