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| Congreve Clock Repair & Rebuild Project |
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| raynerd:
I'm curious know as to how much to take off. I think I'll go down this route as it means I can continue without a workshop! I can't imagine it is too critical as the ball should hug the cut out edge piece as it goes around the corner. |
| chipenter:
I that last video the triangles look to be uneven one is wider than the rest , how good are you with a dremmel to cut the ends , it won't matter iff you need to replace the table cutting the ends off by eye will maybe get it going . |
| RussellT:
Does the ball run on the bottom of the groove or the edges - if it runs on the edges then there is a risk it will fall into a hole if you cut away the end of the triangles. Soft soldering the triangles might be better than gluing. Russell |
| vtsteam:
The ball jumping is one problem. The ball bearing against both the groove and the raised semicircular rail at the turn is another. The ball must, when contacting both, be in sliding contact, not just rolling. It is skidding in the turn. That's a friction entry as well as a jump And that semicircular rail looks rough, too. So it's skidding on a rough surface when entering the jump. I like Noitoen's point about two bearing points as a track - that would minimize sliding contact, and area of contact -- though technically there is a small amount of sliding contact in a curved portion of a railed groove. It is possible that the centrifugal force at the turn is too great for a flat curved track to contain, and the ball might leave the track without a bank. In that case the raised sheet metal turnarounds were probably designed to prevent the ball leaving, as well as direct the turn and force the jump. One way of mimicking a banked turn would be to make the track of two pieces of sheet metal -- one for side A of the groove and one for side B. these would intermesh, like two combs. The root edge of the combs would be bent up to form the banked outside track at the turns. I don't actually see a reason for a bottom, since the ball would ride on the rails, not the rail bed. Except for looks of course, and maybe stiffness. |
| SwarfnStuff:
Not a clock person but after my looking at the photos I tend to agree with Noitoen as I see the Vee points extending under the turn around thus demanding a jump. Seems to me that you have nothing to lose by seeing where the ball jumps and shortening the point to just before that spot. I think the inertia would keep that ball on track to contact the turn around the continue on its merry way. Worth a try as you are contemplating re-cutting the table anyway. John B |
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