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johnd(at)wlcwyo.com
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 Posted: Mon Dec 31, 2012 7:13 am Post subject: Looking for Countersink for 4-40 Screws that allows "tappin |
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Where are these #4's being used?
Sent from Samsung Mobile
Garey Wittich <gareywittich2000(at)yahoo.com> wrote:
I posed the original question. The 4-40 screws I will be using (MS24693 formerly AN507) have the 100 Degree angle just like the the AN426AD rivets. The Countersink I am looking for needs to have a 100 degree angle and have a 0.089" Diameter Guide Pin so the 0.089 Dia hole in the material can be "Tapped" for the 4-40 screw threads after countersinking. Using a 100 Degree Deburring Tool Bit will be too time consuming because of the number of screws used. Using #6 Screws or larger will be a problem. Using the Countersink made by Cleveland for 4-40 screws has too big a diameter Guide Pin. Any ideas where to get the above Countersink (100 Degree Angle and 0.089" Dia Guide Pin) ?? Many thanks, Garey Wittich
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n146wb(at)cfu.net
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| Posted: Mon Dec 31, 2012 1:46 pm Post subject: Looking for Countersink for 4-40 Screws that allows "tappin |
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The only 100 degree countersinks I’ve run across that are even close to .089 are for #40 drill bit holes.
Warren
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Hopperdhh(at)aol.com
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| Posted: Mon Dec 31, 2012 3:20 pm Post subject: Looking for Countersink for 4-40 Screws that allows "tappin |
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Why not drill the holes first with #40 then countersink and then enlarge to .089?
Dan Hopper
RV-7A
Flying since 2004
In a message dated 12/31/2012 4:46:47 P.M. Eastern Standard Time, n146wb(at)cfu.net writes:
| Quote: |
The only 100 degree countersinks I’ve run across that are even close to .089 are for #40 drill bit holes.
Warren
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[quote][b]
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Hopperdhh(at)aol.com
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| Posted: Mon Dec 31, 2012 3:49 pm Post subject: Looking for Countersink for 4-40 Screws that allows "tappin |
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I know this has come up before, but my #40 countersink is undercut enough that it could be turned down to .089 and still cut at the root. That's only .009 to go from .098 to .089. That's only .0045 off the surface.
Dan
In a message dated 12/31/2012 4:46:47 P.M. Eastern Standard Time, n146wb(at)cfu.net writes:
| Quote: |
The only 100 degree countersinks I’ve run across that are even close to .089 are for #40 drill bit holes.
Warren
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[quote][b]
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http://www.matronics.com/Navigator?RV-List |
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