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  #11  
Old 11-02-2017, 06:12 AM
bill v bill v is offline
 
Join Date: Mar 2011
Location: zeeland michigan
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Default drill quides

wirejock is giving good advice
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  #12  
Old 11-02-2017, 11:28 AM
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dwrichey dwrichey is offline
 
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Location: Reedley, California
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In the picture, the hole in the lower corner should first be piloted with a #40 drill. Try to get the #40 centered best you can by spinning the drill slowly and observing how centered it is. When you have manipulated the drill bit to being centered, THEN Squeeze trigger to full speed and complete #40 hole. In general, higher drill speeds is considered better than lower speeds! If hole is off center, don't worry, move on. Then go to #30 drill, the shoulder of the bit can now align itself with the walls of the top (outside) skin, and the drill will go through the bottom skin concentrically. Holes will be very accurate with little effort using this method.
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  #13  
Old 11-02-2017, 01:06 PM
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cdmiller cdmiller is offline
 
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Location: Battle Ground, Washington
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Default My match drilling thoughts

1. Use sharp new high-quality bits. Change often, they get dull fast.

2. Use high-rpm (air) drill for aluminum.

3. Use very light pressure on drill. Let the bit cut its way through the hole.

Dan Miller

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  #14  
Old 11-02-2017, 01:33 PM
Bavafa Bavafa is offline
 
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Location: Sacramento, CA
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Wouldn't a self centering drill bet work easier than a few brass fitting to act as a centering device.
https://www.amazon.com/Bosch-CC2430-.../dp/B0000TZX1M
some of these have interchangeable bits.
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  #15  
Old 11-02-2017, 04:33 PM
RVDan RVDan is offline
 
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One thing I haven?t seen mentioned is to be sure you are using 135 degree split tip bits for aluminum sheet. That helps.
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  #16  
Old 11-02-2017, 05:29 PM
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guidoism guidoism is offline
 
Join Date: Dec 2013
Location: Louisville, KY
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Quote:
Originally Posted by cdmiller View Post
1. Use sharp new high-quality bits. Change often, they get dull fast.

2. Use high-rpm (air) drill for aluminum.

3. Use very light pressure on drill. Let the bit cut its way through the hole.
Thank you everyone for the advice. I've contacted Vans with the pic and the copy of the plans showing exactly what hole it is.

Also, I've done some experiments based on all of your advice. The bit was definitely done. New bit is much much better. I can't believe I didn't realize that.

And I tried the technique using the #40 first and then the #30 and these holes are absolutely perfect. I will be doing that from now on.
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