---------------------------------------------------------- RV-List Digest Archive --- Total Messages Posted Mon 12/31/12: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:13 AM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" for screw threads (John Danielson) 2. 01:46 PM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" for screw threads (Warren Brecheisen) 3. 03:20 PM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" f... (Hopperdhh@aol.com) 4. 03:49 PM - Re: Looking for Countersink for 4-40 Screws that allows "tapping" f... (Hopperdhh@aol.com) ________________________________ Message 1 _____________________________________ Time: 07:13:36 AM PST US From: John Danielson Subject: Re: RV-List: Looking for Countersink for 4-40 Screws that allows "tapping" for screw threads Where are these #4's being used? Sent from Samsung Mobile Garey Wittich wrote: I posed the original question. The 4-40 screws I will be using (MS24693 fo rmerly 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 Degre e Deburring Tool Bit will be too time consuming because of the number of sc rews used. Using #6 Screws or larger will be a problem. Using the Counte rsink 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 rsbooks.com> m> ________________________________ Message 2 _____________________________________ Time: 01:46:17 PM PST US From: "Warren Brecheisen" Subject: RE: RV-List: Looking for Countersink for 4-40 Screws that allows "tapping" for screw threads The only 100 degree countersinks I've run across that are even close to .089 are for #40 drill bit holes. Warren ________________________________ Message 3 _____________________________________ Time: 03:20:32 PM PST US From: Hopperdhh@aol.com Subject: Re: RV-List: Looking for Countersink for 4-40 Screws that allows "tapping" f... 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@cfu.net writes: The only 100 degree countersinks I=99ve run across that are even clo se to .089 are for #40 drill bit holes. Warren (http://www.aeroelectric.com/) (http://www.buildersbooks.com/) (http://www.homebuilthelp.com/) (http://www.matronics.com/contribution) (http://www.matronics.com/Navigator?RV-List) ________________________________ Message 4 _____________________________________ Time: 03:49:15 PM PST US From: Hopperdhh@aol.com Subject: Re: RV-List: Looking for Countersink for 4-40 Screws that allows "tapping" f... 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@cfu.net writes: The only 100 degree countersinks I=99ve run across that are even clo se to .089 are for #40 drill bit holes. Warren (http://www.aeroelectric.com/) (http://www.buildersbooks.com/) (http://www.homebuilthelp.com/) (http://www.matronics.com/contribution) (http://www.matronics.com/Navigator?RV-List) ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv-list Browse Digests http://www.matronics.com/digest/rv-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.