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Post by Threader on Oct 22, 2004 16:51:46 GMT -6
If you are limited to using the stock axle slots then this is not even an area to think about.
BUT, if you can a longer wheelbase has been tested and it should make your car faster. ;D
You can cut new slots using two hacksaw blades. You can cut new slots with a table saw, be careful.
You can drill holes using the pro tool available. It does a good job, follow the instructions.
Make sure to measure and keep the wheels from extending past the front and rear of the car when you drill the holes.
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Post by Sssnake on Nov 11, 2004 19:06:57 GMT -6
If you must use the original slots,consider removing the back of the block and gluing it to the front. This will maximize your PE by moving your weight up higher on the track.
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Post by Sssnake on Nov 14, 2004 9:17:46 GMT -6
In reality a short wheelbase car can be faster on the start than a long wheelbase car. This is due the longer fall of the weight before any losses to rotational Kinetic energy. The advantage of the long wheel base is in stability and guide rail clearance. If you can build the car to address these problems, the short wheelbase car will be a winner.
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Post by scdad on Dec 17, 2004 12:01:00 GMT -6
My question concerns the Pro Body tool.
I am using BSA pinewood derby car and have to use the slots.
Does the Probody Tool help with alingment?
That seems to be the biggest problem I have left to solve . This is my sons 3 rd year.
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Post by WarpSpeedINC on Dec 17, 2004 15:31:20 GMT -6
The Pro-body tool is a drill guide for drilling holes for the axles. If you must use the stock slots, this will be of no value.
You will have to use the shimming method , wax paper works the best. First, you must make sure you're axles are perfectly straight. The Pro-axle press is a must. We just started using it and you would be surprised how well it works (less than .0005 runout).
With zero camber, you will have proper alignment when you can roll the car forward or backward and the wheel doesn't migrate. Start with wheels against the body, roll forward,then backward. Next, pull them out against the axle head and repeat the process. shim in front or behind the axle as neaded.
You will have good alignment when they don't move either way.
If you are allowed to run on three wheels, you'll want to lift one slightly, then shim the touching one until the car goes straight.
Refer to the above post by Snake when he mentions cutting the back of the block and adding it to the front. Best case is for the car to measure 7 inches from front of car to the backside of the rear wheel OD. This will maximize the use of the available energy (The car will fall for as long as possible with the given dimensions). If you're rules allow this, it is a must.
Good Luck and happy racing!!
Jay
Warp Speed Inc.
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Post by Sssnake on Dec 17, 2004 18:13:00 GMT -6
Scdad,
The Pro body tool can be used with the original slots, when you clamp it to the car ,line it up with the slot. The holes when drilled will end up in the slots removing just enough to make a good fit for the axles. This squares your axles and predrills your slots to prevent cracks when installing your axles.
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GILLS
Pine Head
Posts: 49
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Post by GILLS on Dec 17, 2004 18:18:26 GMT -6
You may want to doublecheck your rules to see if they will allow you to cut a new axle slot if the original is skewed. To check get a small framers square or a sliding square and lay it against the long side of the car. The opposite side of the square will lay across your axle slot. If the axle slot is not skewed uphill or downhill of your square than you are o.k. and the pro body tool should work. If your axle slot is skewed than re-cut them on a bansaw, usually two bladewidths is enough. then use the pro body tool. Good Luck!
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Post by WarpSpeedINC on Dec 18, 2004 5:03:53 GMT -6
Thanks guy's for correcting me on this. Just received a pro-body tool to use for our first derby workshop. Didn't think there was enough material in the stock slot for the body tool to do anything. After reading you're above post, we tried it on a stock block and it worked pretty good. We are allowed an extended wheel base in our district so we had never tried this.
Great Tip!
Snake, Are you coming back to WIRL soon?
Good luck and happy racing!!
Jay
Warp Speed Inc
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