This design I call lacy because of the appearance of the “spokes” of the the clock. The running train design is really very basic with the number two wheel of the running train being the center wheel from which the time train is driven
The gear process starts with the design for the “spokes”. This is really a motif that has a continuous connection from the center to the rim that can act as spokes.
The dremel router cuts at 9 inches per minutes and takes 0.09 inches depth per pass.
It takes an hour to cut the design which gives me time to do this blog!
I have discovered that I get a cleaner cut from a counter clockwise cut because of the bit rotation.
The design layout is not my own but rather comes from Switcher
Free DXF Files - myDXF.blogspot.com This guy regularly puts up free DXF files and the “spoke” pattern is one of those, somewhat modified
Each wheel has the same lacy pattern for spokes. This is a complex pattern that involves 80,000 lines of code for the CNC machine. It takes over an hour to cut.
The smallest wheel is the escape wheel at 3 inches and the largest which isn’t shown here will be nearly 8 inches.
This is the set of five wheels which will make up the running train of the clock. I think I’ll mount them horizontally in an arc as shown in this photo.
With the wheels being so busy, I decided to leave the pinions as plain a possible. The two on the left are 1/2” thick while the two bigger ones are 1” thick.
Just sitting on their respective wheels - I like the combination.
These are all escape wheels that “didn’t work”. The upper left had too big a witness the next three all had bad teeth as the witness was too small. The solid one worked but needed spokes.
I test the wheels for wobble by spinning on a hand held arbor. I can live with about 1/8” wobble but no more.
The first attempt at a pendulum and pallets. I can follow the text on how to build pallets but mine always need fine tuning to get them right.
working out the arbor spacing is always done on the depthing guage and then transfer the measurement to the plates.
The fulls set is spinning with 8 ounces of weight. This set is very quiet just spinning on its own which is a good sign.
All of these pallets were drawn in CAD and all would “work”. I was not happy with the performance at the test bench and therefore each one is very slightly different
I arrived at brass recoil pallets as the best I could do for this clock. The 5 inch pendulum is preliminary and has a 4 ounce bob on it. So far it works well
The Plates for this clock will be based on the same “Lacy” motif that is the signature of this clock
At this point the plates look like some sort of mechanical animal. We’ll have to see how it looks assembled - might have to re-think the plates.
On the wall it still looks like some medieval machine or beast!
I don’t like the look!
I glued the front and back plate together and like the clock better with only a back plate and “floating” wheels. The running train is complete and it works.
The last part of the construction is the time train. In order to use the same arbors as the great wheel and the second (minute) wheel the reduction train is really big. I may change that.
After looking at the huge gears that make up the time train I decided that I couldn’t live with it so I made a change.
With no front plate I was faced with how do I get an arbor out front with no plate. So... I made a “floating” plate that rides by bushings on the great wheel and the second wheel.
This allowed the gear set to be any size I choose. I opted for about 2.5 inch diameter wheels and about 1 inch pinions on 48mm centers
The overall appearance is 100% improved.
The minute hand follows the second wheel and the hour hand is attached to the time train set.
I may colour the time train gears a contrasting color but haven’t decided yet.