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How to Precisely Check Alignment

Discussion in 'Pinewood Derby Help Videos' started by LightninBoy, Apr 5, 2016.

  1. GravityX

    GravityX PWD Royalty Pro Racer

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    Best place to find pin gages is McMaster Carr, although not the cheapest place. You may also want to search eBay, Zoro, Fastenal, etc...
     
  2. bracketracer

    bracketracer PWD Royalty Pro Racer

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    Troy, I bought them from McMaster Carr. Some of the sizes were special order, if you don't see a size listed that you want, just scroll the drop down size box to the bottom and click "Other" then type in the size you want.
    http://www.mcmaster.com/#23065a504/=13vfuq8
     
  3. gdurban

    gdurban District Champion

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  4. GravityX

    GravityX PWD Royalty Pro Racer

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    Even in the half sizes too! Tough to beat that deal if you have a Prime account, free shipping! I seem to forget about looking at Amazon for some of these items.
     
  5. Troy Taylor

    Troy Taylor Pinewood Ninja

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    Thanks guys! Getting some on order tonight! :)
     
  6. bracketracer

    bracketracer PWD Royalty Pro Racer

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    Those pins on Amazon are class ZZ go pins, the ones on Mcmaster are class Z no-go pins. The ZZ's have a greater allowable tolerance so they will be cheaper. Probably absolutely fine for what we use them for, just be aware of the differences.
     
  7. jjackrash

    jjackrash Pinewood Ninja

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    So, if you check alignment, and see a sliver of light, the remedy is to toss the block in the trash and start over, correct?
     
  8. Skywalker Racing

    Skywalker Racing Council Champion Pro Racer

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    Not necessarily - not for a very slight toe. None of my cars have had Lightnin Boy textbook alignment and have still done well.

    Shoot for perfection but don't let imperfection keep you from racing.

    Good luck!
     
  9. jjackrash

    jjackrash Pinewood Ninja

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    Thanks!
     
    Skywalker Racing likes this.
  10. LightninBoy

    LightninBoy League Racer 5+ Pro Race Wins!

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    This alignment test is really really really .... really sensitive. Is exposes even the smallest errors. There is certainly a point where its close enough to perfect that getting more perfect would be of no benefit. I have no idea where that point is. So when going up against the best of the best - yeah I toss the block if I see light. Or I flip it over and try again on the other side.
     
  11. jjackrash

    jjackrash Pinewood Ninja

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    I am using silver bullet pro and haven't gotten two axles to pass in about 12-15 tries. I have gotten one axle to pass a few times. I tried a car that was close, and the wheels were traveling in. The next car I tried that was pretty close worked great.
     
  12. Maglev

    Maglev Council Champion Pro Racer

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    Fill the bad hole with toothpick and super glue then cut it off and sand it smooth and re-drill until u get it perfect. I do it all the time.
     
  13. Vitamin K

    Vitamin K Guest

    Maybe check the alignment of your tool? Insert two .089" pin gages through the bushings, and check to see that they are meeting in the middle, and that they are parallel.
     
  14. jjackrash

    jjackrash Pinewood Ninja

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    I just checked, the tool is dead on. For some reason all the blocks I ordered have just a touch of play in the tool instead of over tight like ones I have had in the past. I am trying to press one side tight and clamp and I have had better luck doing that and drilling real slow. I have several bodies now that are perfect on one side and very very close on the other and they are passing the roll test, so I am thinking good enough for a scout race.
     
  15. Mojo Racing

    Mojo Racing National Contender Pro Racer

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    If you press it to one side, it will make a lazy drill with your car. One side will be a different angle than the other because one side is higher. Do both sides evenly
     
  16. jjackrash

    jjackrash Pinewood Ninja

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    Damn, I wish I had thicker bodies. How do I get it square and even on both sides with a touch of play between the block of wood and the jig?
     
  17. Mojo Racing

    Mojo Racing National Contender Pro Racer

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  18. jjackrash

    jjackrash Pinewood Ninja

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    Good thinking. :)
     
  19. txchemist

    txchemist National Contender

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    I have lots of blocks that were set aside as perfect for the snug fit. Then just before drilling, tested again and they were all too loose. Wait for a rainy day and they will be too tight. Moisture will come and go. Impossible to not have wood change somewhat. When I cut blocks, I cut inside the house @ 50% R.H. ( hooked up to a vacuum cleaner - I have not been caught by my wife yet) Then they should not need sanding, but often will need the tape to get snug. I have both thin and thicker shipping tape for shimming.
     
  20. FDM

    FDM District Champion

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    So would you drill the wood block first and then start cutting it for weight pockets and so forth, or would you cut the pockets first and then drill? I normally do the last since I always thought that cutting a signification amount of wood away could change the alignment.
     

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