Good morning, the only time I need to drill holes at an angle was through wood. That can be done with a common drill press (ie still having the drill point vertically downwards), however you angle upwards the material to drill into at the appropriate angle. Also it has to be secured properly otherwise the drill bit tends to 'slip' especially at very shallow angles.
Best regards Alex On Mon, Jun 13, 2011 at 10:00 AM, Frank King <[email protected]>wrote: > Dear Hannes, > > Your problem is turning into a bed of nails... > > > ...the dial I had in mind would be vertical > > and facing south-east... > > That makes the problem more interesting! > > > ... I can see no way, with my limited abilities, > > to get the angles of all those gnomons right. > > Any ideas? > > I imagine that all your gnomons are going to be > the same. If you can get ONE right you can get > all the others right! Here are two questions: > > What kind of gnomon you would use if you were > making a conventional dial with ONE gnomon? > > How would you would attach it to the dial? > > You seem to want some kind of rod gnomon. You > can attach that either by drilling a hole or by > making up some kind of mounting. > > It is very difficult to drill a hole that isn't > perpendicular to the surface being drilled. It > is probably easier to make some kind of mounting. > > You calculate the sub-style height in the usual > way and then design a simple mount. You then > go into mass production. > > All the gnomons have to point in the same direction > so you have to have the sub-styles parallel. > > There is one interesting constraint that you > DON'T have... > > Your hour-lines don't have to radiate from the > same point. You could arrange your sundial on > a tall thin column with the hour-lines running > down, in order, from top to bottom, say from > 4h to 14h for a dial that declines south-east. > > More interesting still, you could have a > 24-sided post with the 6h hour-line on the > side that faces east and the 12h hour line > on the side that faces south and so on. > > I have a final piece of advice... > > If you really want to drill lots of holes > at awkward angles you are going to need > some kind of jig. I cannot think of a > good way to design this jig but I am sure > there are other list members who can help. > > All the best > > Frank King > Cambridge, UK > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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