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Hole Finder
There are a few accomplished and talented brains here that can help with this. We have a tailwheel steering control horn with holes already drilled at right angles through its long shaft for two AN-3 bolts-- to fix it inside the rudder's vertical tube. Now when the shaft is inserted up inside the 4130 tubing of the new rudder, what would be the best way to drill the rudder's tube accurately, without missing the holes in the shaft or wallowing them out? Those two AN-3 bolts are in shear and of course fasten the tailwheel steering horn to the rudder. We want precision, and no slop. The old rudder's holes looked like hell. I can see where the problem was encountered elsewhere and the holes in the tailwheel steering horn were elongated, then welded back and re-drilled-- not such a good idea since the control horn is aluminum alloy. Ever seen that little mag-pecker device that lets you find a blind hole you need to drill through to? There is a magnet centered in the blind hole, which a sharp needle points to, making a prick in the precise spot where you drill. Well, I don't think it will work here, but bet you could make one that would. TIA and apologise for all the Freudian terms. |
#2
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Hole Finder
Gee I'm surprised none of the resident experts has responded to your
question yet. Especially since it begs for a smart-axx answer Simple, use a hole finder. Same principle at the commercial ones that you buy. Overlay a thin piece of metal over the horn's shaft to mark the holes and fasten at a point below what is being inserted in the rudder tube. Slide the horn and into the rudder and keep the hole finder on the outside. Wa lah you have the hole location. I'm not sure what degree of precision you are desiring. Use a small drill to open the hole in the rudder tube then use appropriate piloted or non-piloted reamers for final sizing. wrote in message ups.com... There are a few accomplished and talented brains here that can help with this. We have a tailwheel steering control horn with holes already drilled at right angles through its long shaft for two AN-3 bolts-- to fix it inside the rudder's vertical tube. Now when the shaft is inserted up inside the 4130 tubing of the new rudder, what would be the best way to drill the rudder's tube accurately, without missing the holes in the shaft or wallowing them out? Those two AN-3 bolts are in shear and of course fasten the tailwheel steering horn to the rudder. We want precision, and no slop. The old rudder's holes looked like hell. I can see where the problem was encountered elsewhere and the holes in the tailwheel steering horn were elongated, then welded back and re-drilled-- not such a good idea since the control horn is aluminum alloy. Ever seen that little mag-pecker device that lets you find a blind hole you need to drill through to? There is a magnet centered in the blind hole, which a sharp needle points to, making a prick in the precise spot where you drill. Well, I don't think it will work here, but bet you could make one that would. TIA and apologise for all the Freudian terms. *** Free account sponsored by SecureIX.com *** *** Encrypt your Internet usage with a free VPN account from http://www.SecureIX.com *** |
#3
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Hole Finder
Excellent, my friend. Thanks.
That is precise enough. We just don't want any slop so that you have to use tension loads rather than shear to hold the yoke in place. |
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