p.mulwitz(at)worldnet.att
Guest
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 Posted: Sat Aug 12, 2006 6:57 pm Post subject: Hole Drilling (was clecos again). |
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HI Bill,
It seems your techniques and mine are mirror images. I always start holes with 3/32 (#40) drill and enlarge from there. That means I always use the silver clecos on every hole. I use more of the silver than the other ones since I only use the other ones after enlarging and I rivet the holes shortly after that.
One other impact of this way of drilling holes is that only the #40 drill starts holes. That means I like to have a split point drill for the number 40 but all the others can just as well be standard point drills. This is not a big deal for new bits, but I resharpen all my bits until they break or are so short I can't use them any more. I resharpen them by hand on a standard bench grinder so the split points are a bit of a pain I would just as leave avoid.
Another practice I adopted is I try to never drill more than one layer of metal at a time. This is a bit conservative compared to the instructions supplied with the kit. However, I feel it reduces the chances of making mistakes.
I don't know for sure, but I feel the process of enlarging holes (with clecos in every other hole) actually helps get the parts and holes better aligned for rivets. I can't be sure that enlarging twice from #40 to #30 and then from #30 to #20 actually improves the fit compared to doing it all in one step, but I feel this is a possibility. In any case, that is how I do it.
Just for the sake of documenting an old-timer's jargon I will pass on a little conversation I had with Richard VanGrunsven (THE R.V. in the RV series of planes). He refers to the process of aligning holes by drilling through one part with a hole in it to another with no hole as "Match Drilling". For the process of enlarging holes that already exist in all the parts he uses the term "Line Drilling". I see no reason not to copy his jargon.
Best regards,
Paul
XL fuselage
At 10:47 AM 8/12/2006, you wrote:
| Quote: | | I've never used a silver cleco yet, and have 300 each black and gold. I'll probably use the 50 silvers I have when I get to the fuse. With the skeleton nailed down, there was no need to use the silvers on the wings. |
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