Society of Robots - Robot Forum
General Misc => Misc => Topic started by: airman00 on December 17, 2007, 02:49:31 PM
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I need to make a hole on a CAD
What size diameter does a #4 machine screw go through? Would 3/8" be good?
P.S. I cannot test it out tonight and so I need an answer today
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A #4-40 machine screw goes through a 1/8" hole without touching the sides. 7/64 makes a much tighter fit, but hard to slide in and out. I usually drill my #4-40 clearance holes to 1/8".
If you want to drill a hole to tap for #4-40, you need to drill a hole using a #43 drill bit, which is roughly 0.089".
- Jon
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does anyone have a site that has a chart for all these?
They come in handy.. and i can never find them online
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http://www.americanfastener.com/technical/tap_and_drill_size_chart.asp
- Jon
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Thanks guys,
i got this equation to convert # into inches
Diameter = ( # x .013") + .06"
So a #4 screw would be .58" in diameter
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Your equation is probably correct, but your math is way off.
(4 * 0.013") + 0.06" = 0.112"
- Jon
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Your equation is probably correct, but your math is way off.
(4 * 0.013") + 0.06" = 0.112"
- Jon
lol , i realized that ! ;D I was about to go back and correct the post, since I realized a .58" diameter screw is pretty thick, way too think for a #4/
anyway I used a 5/32" bit
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5/32" will be way too big - your screw will wobble like crazy.
5/32" = 0.156"
I typically use 1/8", which is 0.125"...
- Jon
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thanks jon ;D
1/8 it is ! ;)
i think i'm going to go to sleep now, i had no sleep in the past 24 hours