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Published on Aug 27, 2016
Making The Crutch Assembly And Eccentric Bushing, by Clickspring.
In this video I make a start on the escapement of the clock, starting with the crutch assembly and a component that permits a slight adjustment of the pallet depth of engagement with the escape wheel.
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00:21 Generally speaking the escapement is considered to be the pallets and the escapewheel, but there are usually a few extra components required to make the whole thing work, and its those related components that I'm making in this video. There's an eccentric bushing that permits a small adjustment of the pallet depthing with the escape wheel, enabling fine tuning of the escapement. 00:41 And then there's the crutch assembly, which receives the energy released by the escapement, and transmits it to the pendulum to keep it moving. 02:17 With the taper formed, I transferred the work to the mill, to put in the other features. The embryo part can now be cut from the parent stock, to form the small clamping slot. But before I make the slot, here's a closer look at the fastener hole. One half has been drilled for clearance, and the other half is at the correct diameter to be tapped for the fastener thread. 05:30 I've got the work set up on this pumice stone to protect the bench, and the heat is being applied using a small butane torch. Up close, you can see the flux run, leaving behind a tiny matrix of silver solder adjacent to the join. A little more heat, and then that solder melts and wicks into the small gap between the parts, while the excess solder forms a nice fillet. 06:56 And I'm happy enough with a tool finish for this part, so I'll leave that as the final surface. The spigot has done its job, so that can be taken off with some abrasive paper, leaving a grained surface finish on that underside surface. The final step for this part is to use needle files and abrasive paper to bring the perimeter to final shape and dimension. 09:06 The bend locations are positioned roughly one third in from each end, and it really is just as simple as getting a good hold of it in the vise, and giving a careful push until its about right. The 3 parts of the crutch assembly are now complete, so a small spot of Loctite on each end is all that's required to bond them together. OK, now on to the eccentric bushing. 10:57 The central axis was located with a wiggler, and then a tiny offset was introduced to the spindle, so that the hole would be formed off center - as the name of the part suggests. 12:46 All three were made in the same way that you've seen in previous videos, using the small lathe. They were then hardened, tempered, and then polished and blued. Ok, so with the fasteners complete, I can start to put a few of the bits and pieces 14:56 Particularly since the eccentric bushing can an additional offset angle depending on where it sits in its rotation. Once it looked about right, I put the frames back together to give it all a test fit. 15:37 I've left the barest clearance between the crutch fork and the pendulum block, to minimise energy loss, and the eccentric bushing is ready to be adjusted as required in the next episode. Which leaves just a few key components to be made, before I can set the clock running.