---------------------------------------------------------- RV8-List Digest Archive --- Total Messages Posted Sun 06/14/09: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:51 PM - Bolt Hole Clearance - Elevator Horn (Garey Wittich) 2. 09:20 PM - Re: Bolt Hole Clearance - Elevator Horn (Brian Huffaker) ________________________________ Message 1 _____________________________________ Time: 08:51:49 PM PST US From: Garey Wittich Subject: RV8-List: Bolt Hole Clearance - Elevator Horn REF: -Regarding the 1/4 inch bolt holes in the Elevator Control Horns, ab out which the Left & Right Elevator Horns rotate on the center Hinge Bearin g fastened to the center of the Horiz Stabilizer. After drilling these 1/4 inch diameter holes (for the AN4 Bolt), these hole s are too close to the weld fillet that welds the torque tube to the perpen dicular part of the Horn. -The weld fillets on my L & R Horns go ALL the way around the Tube. Thus the AN4 Bolt HEAD and corresponding Nut HEAD will come in contact with the "weld fillet" BEFORE they are tightened. -- - After reading the "Archieves" for possible solutions and some of my own thoughts it seems the options are (looking for the BEST Option): 1) Die Grind the weld fillet in the area where the Bolt and Nut heads will be, then spot prime with Zinc Chromate. 2) -Grind the weld fillet where the Nut Head will be and then use a reduc ed size Nut (MS21042-4) that has a smaller diameter than the -one supplie d by Vans. 3) -Use regular AN960 Washers and "contour them" to fit over the weld fil let so Bolt Head and Nut fit snug against them. -(Will need a longer Bolt than supplied by Vans.) 4) -Make a "thick" washer out of stainless steel (i.e. 1/8" thick) and "c ontour it" to fit over the weld fillets; thus the Bolt and Nut heads have a flat surface to tighten against. -Again a longer Bolt will be required. -<----- Seems the BEST approach to me. - Any subtle issues involved ??? How did YOU handle this situation ??????? Appreciate your comments !!! Thanks, - Garey Wittich - Santa Monica, CA=0A=0A=0A ________________________________ Message 2 _____________________________________ Time: 09:20:01 PM PST US From: Brian Huffaker Subject: Re: RV8-List: Bolt Hole Clearance - Elevator Horn On Sun, 14 Jun 2009, Garey Wittich wrote: > - After reading the "Archieves" for possible solutions and some of my >own thoughts it seems the options are (looking for the BEST Option): > 1) Die Grind the weld fillet in the area where the Bolt and Nut heads >will be, then spot prime with Zinc Chromate. >> 2) -Grind the weld fillet where the Nut Head will be and then use a >reduced size Nut (MS21042-4) that has a smaller diameter than the -one >supplied by Vans. I believe that grinding away the fillet on a structural weld is a bad idea, leaves a stress riser and weakens the part. Van is pretty good at only using steel where absolutely needed for strength so I doubt there is enough extra to remove this safely. > 3) -Use regular AN960 Washers and "contour them" to fit over the weld >fillet so Bolt Head and Nut fit snug against them. -(Will need a longer >Bolt than supplied by Vans.) > 4) -Make a "thick" washer out of stainless steel (i.e. 1/8" thick) and >"contour it" to fit over the weld fillets; thus the Bolt and Nut heads >have a flat surface to tighten against. -Again a longer Bolt will be >required. -<----- Seems the BEST approach to me. - Any subtle issues >involved ??? Either of these sound good to me. > How did YOU handle this situation ??????? Just checked my parts, my hole is close, but it has enough space for a washer and bolt head between this hole and the weld. Brian Huffaker, DSWL (bifft@xmission.com) RV-8A 80091 Fitting canopy latch. 1/4 Starduster II N23UT flying



------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv8-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV8-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/rv8-list Browse Digests http://www.matronics.com/digest/rv8-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.