Derby Talk is a forum for Pinewood Derby, Awana Grand Prix, Kub Kar Rally, Shape N Race Derby, Space Derby, Raingutter Regatta and other similar races where a child and an adult work together to create a race vehicle and a lot of fun and memories
Given that the mold is ejected from the inside of the wheel, wouldn't it make sense that there'd be a slight taper in the bore to allow for easy part removal? That said, I don't believe that a tapered bore is an issue when running canted axles. In fact, it seems like it would cause a perfectly straight axle to ride with a slight negative camber?Speedster wrote: ↑Fri Dec 01, 2017 7:41 amHodges Hobby House shows pictures of the 2009 wheel and says there is a "Bore Squish", Larger in the center and smaller on the ends. I can't tell when I polish the bores. Are the ends exactly the same size? More often then not, when setting up a car to rail ride, the rear wheels will migrate to the nail heads when rolling the car both forward or rearward. I install the axle with the Derbyworx tool and try to get the axles in as straight as possible because of our rules. I can find no information on How a Pinewood Derby wheel is made.
I don't know much about the molding process, unfortunately. The three dots are likely where the injection points are for the mold.Speedster wrote: ↑Fri Dec 01, 2017 10:07 amVK, I hope you're right. That's what I'm counting on. We are not allowed to run canted wheels and the wheels seem to always go to the axle head instead of the car body. That is exactly what I want to happen. The wheels will sit "Straight up and Down" per our rules.
I'm assuming the 3 "dots" have something to do with the ejection process. I'd be interested to know exactly how the wheel is ejected. Do you know?
Good call, Whoda! That was a very fascinating article.whodathunkit wrote: ↑Sun Dec 03, 2017 9:55 pmSpeedster and Vk,
I don't know how the BSA wheels are
mold injected for sure.
How ever check out Max V's news letter
On the making of his Max V wheels.
May 5th 2017 news letter!
There is some good info along with photos to check out.
And it's probably close to how the BSA wheels are mold injected as well.