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Mechanics 101 Can't get it to run right? Find a trick to add HP?
From the first oil change to completely rebuilding the engine,
this is the place to talk about the heart of the beast!


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Old 10-02-2007, 05:34 PM   #1
arsenic
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Default drill bit and tap sizes

I don't know if this is important to anyone, but here you go. I made a spread sheet of all the metric tap sizes and drill bits along with the fractional equivalents. The ones with a * next to them are spark plug sizes.

(that's the spread sheet with all of BP's additions, thanks )

Last edited by arsenic; 04-01-2008 at 01:46 AM..
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Old 10-02-2007, 06:16 PM   #2
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for anyone wondering, yes I do have too much time on my hands
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Old 11-26-2007, 12:25 PM   #3
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FYI- This came in so handy today, so THANK YOU SO MUCH!!!
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Old 11-26-2007, 01:05 PM   #4
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Good list Arsenic..
Some notes and additions:

Most times the drill called out is for what is known as 75% tapping. This is standard. Smaller drills will allow higher engagement but run the risk of binding while tapping. Larger drills, less engagement but run the risk of the screw pulling out the threads at torque.

The softer the material the coarser the thread. Coarse threads are deeper and allow more material to be in sheer. Don't be fooled into using a fine thread thinking you have more threads so better holding power..

Sharp drill will cut undersized. Dull ones over sized and hand drilling is generally over sized as well. When hand drilling something around 4mm to 5 mm I use a smaller drill.

I added a few sizes that are accepted for metric as well as some eye balled sizes. There are 4 major types of drill available at good hardware stores/ machine shop suppliers:
Fractional (drills sized by fractions of an inch in 1/64th increments)
Numbered (drills sized numerically. Larger the number the smaller the drill)
Letter (these take over after number drill #1.)
Metric..
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File Type: jpg drill tap.JPG (50.7 KB, 102 views)

Last edited by Black_peter; 11-26-2007 at 01:09 PM..
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Old 11-26-2007, 01:48 PM   #5
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thanks BP, that's awesome. I just put what I knew worked, I didn't have that so important work shop cross over.
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Old 01-24-2008, 03:30 PM   #6
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I HIGHLY recommend this website for mm or # or letter drill bits.
http://www.littlemachineshop.com/
I ordered a 4.3mm drill for $4.60 shipped to my door.

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Old 01-24-2008, 03:35 PM   #7
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Son of a gun..
I built this when I was in 5th grade..
(from the plans not a kit)
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Old 02-09-2008, 03:19 PM   #8
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here's an SAE to Metric conversion chart by 64th of an inch. I've seen these charts, but only by 16th, so I made one.


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Old 02-09-2008, 03:22 PM   #9
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This should really get stickied under Mechanics 101 maybe under how-to as well..
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Old 02-09-2008, 03:52 PM   #10
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it IS a sticky in mechanics 101. I made sure of that before I posted it

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