Derby Worx "Pro Hub Tool"

[RacerX]

The Pro Hub Tool has 4 important uses in building a Pinewood Derby car and is the Cornerstone of performance.



A. The Pro Hub Tool is used for sizing wheel hub bores. Hubs can vary in size as much as .010” in molded wheels. The Pro Hub Tool will allow the builder to ream their wheel hubs all to the same size or help in selecting 4 wheels with similar hubs, this is one if the most important steps in alignment because it allows the car to sit square with equal radius’s on all wheels [distance from the hub to the tread] even if all of the wheels are the same finished size, the hub variances will prevent the car from sitting square to the track.
B. The Pro Hub Tool is used for squaring hubs. All hubs have defects from the molding process that prevents them from being mounted correctly on a mandrel. The Pro Hub Tool will square the in-board hub to the centerline of the wheel, which allows for the most accurate tread face finishing.
C. The Pro Hub Tool is used for coning the hubs. All derby cars will benefit from coning the in-board hub for a reduction in body to hub friction. The Pro Hub Tool makes a even, polished cone that reduces body contact by 95% and can even be used to polish in graphite by adding a small amount in the dished end after coning for even more friction reduction.
D. The Pro Hub Tool is the base for using the Pro Wheel Shaver and the Pro Hub Shaver attachments, which make the Pro Hub Tool truly a universal tool.

Race Fast

Racer X

www.Derbyworx.com

[RacerX]

The corner stone of P.W.D. building when Father and son join together to build a fast car!!!!


Race Fast

Racer X

[cubs]

What is the grit of the fine-grit sandpaper?
What is the grit of the coarse-grit sandpaper?
The little squares that came with my tool are all used up. And the directions doesn't list the grit.

[DerbyDoc.com]

I can tell you what I use. I use a 400 grit to rough-in the coned hub. Then Ill sand all the way up to 1000 grit. Ill also tell you a little secret, but this is between the old Derby Doc, and you. On the final sanding with the Pro Hub Tool, put a little graphite on the sandpaper, and poish the coned hub with it. Believe me, it makes a difference.
PS- The times will fall off when you pay attention to the details. This is the reason that guys like you have results that pay off. Good luck at the races.