Numbers on outer wheel hub assemblies

Was at Michigan's Adventure today and noticed numbers written with a sharpie on outer wheel hub assembly's, like .009, .012, .002. I know their are alot wiser people on this site then me that probably know what they mean. Do they mean that is difference between the axle fitting in the wheel itself. I Have never noticed this on any other roller coaster, today they just stuck out like a sore thumb.

windixie06

That is Dick Kinzel's IQ for the past 3 years. Just like his shoe size is on Disaster Transport.

RideMan, this is your area.

Last edited by Mr. Ninja,

This is nothing more than a guess, but I know some coasters use a mix of wheel types in conjunction with each other. Perhaps the numbers identify each type of wheel?

I have nothing...I'm guessing you're talking specifically about Corkscrew and whatever they call the SLC up there?

I know that at Kennywood they mark the wheel with its installation date. What were the numbers again? Numbers in the thousandths? That sounds like some kind of a clearance measurement...

Sorry, I haven't seen them and I have no idea. :)

--Dave Althoff, Jr.


    /X\      *** Respect rides. They do not respect you. ***
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Erik Lee said:
Was at Michigan's Adventure today and noticed numbers...
.009, .012, .002.

RideMan said:
Numbers in the thousandths? That sounds like some kind of a clearance measurement...

Obviously you're the authority on this, but while the valued (being in the thousands) certainly could indicate they're clearance measurements, would it be normal to have such a variation between different wheels (i.e. a hundredth of an inch)? I suppose that would depend on what clearance is being measured, though.

Brandon

djDaemon said:
Obviously you're the authority on this,...

Says who? I thought I already said I was guessing! :)

...but while the valued (being in the thousands) certainly could indicate they're clearance measurements, would it be normal to have such a variation between different wheels (i.e. a hundredth of an inch)? I suppose that would depend on what clearance is being measured, though.

That's the thing. We don't know what's being measured. I suppose it could be the amount of unbalance on the wheel, or something to do with the thickness of the tire. The only thing we really know is that it appears to be some value precise to the thousandths of something or other, for which variations in the hundredths is an acceptable tolerance. We don't even know the units. Thousandths of an inch? Millimeters? Microns? Ounces? Meters?

--Dave Althoff, Jr.


    /X\      *** Respect rides. They do not respect you. ***
   /XXX\     /X\     /X\_      _     /X\__      _      _____
  /XXXXX\   /XXX\   /XXXX\_   /X\   /XXXXX\    /X\    /XXXXX
_/XXXXXXX\_/XXXXX\_/XXXXXXX\_/XXX\_/XXXXXXX\__/XXX\__/XXXXXX

A thousandth of a micron? Now THAT'S precision! :)

Brandon

I guess I only saw the numbers because the wheels aren't covered up on Thunderhawk like they are on most coasters. But your guesses of clearence of some kind are alot like mine. There also was no date next to the numbers that that I saw.

Another question does CP have a machine shop on site were they make any of their own parts, or do they just order everything pre-fab?

windixie06

They have a machine shop but depending on what needs to be made, they might have to order it if they can't make it or have time to make it.

-Chris
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