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Discussion in 'Clock Construction' started by WMello, Oct 3, 2017.
Wagner it has been an interesting trip. What is your next project?
Hey David, thank you.
But this project still needs months of work.
I am working on the dial. Then a stainless or brass line.
Then everything must be disassembled, polished and varnished.
Then a kind of glass cabinet is required, and maybe a table/stand.
The first picture shows an engraving bit holder does it not? The spring holds the foot against the job so the tool depth is constant even if the job is not perfectly flat. How deep is the engraving? The minute rings & minute markers are beautifully thin and sharp & consistent. How wide are they? It looks fabulous.
How are you fixing the chapter ring? Presumably not dial feet or the would need to be there already wouldn't they? Chapter ring looks great.
Hello, thank you.
The dial is cumming along ok. There was some failures on the way. I'm working on a video right now; trying to keep it short and not boring; maybe by this afternoon.
The engraver is a diamond drag engraver, 120 degree angle. (Got it a long time, think is a 120 degree, but not sure).
The bit is dragged over the previously lacquered surface, removing the protective lacquer (the spindle is not rotating). Like a classic craftsman would do manually. The spring is there to apply a constant force. The width of the cut depends on the angle of the point, the spring force and the speed of the dragging...
The plate is then immersed in acid (Ferric Chloride) for an hour or so. The acid eats out the exposed areas. The depth of cut depends on how strong is the solution and how long is the bath.
The challenge, and failures, is on selecting the cover layer (resist), the application, the cleanliness of the plate, the selection of spring, bit, speed, time in the acid bath and dozens of other things.
The drawing was made so the numerals are 1/2" tall, 0.062" and 0.008" width of stroke. the chapter ring marks for the 5 minutes are 0.062" wide at the top and 0.094" long. The circles and marks are of a single stroke; Probably around 0.004" wide.
The dial will eventually be fitted with brass rings (bezels ?) and fixed to the clock via brass pillars and feet; those will be screwed to the clock and glued to the dial.
Why not CNC engrave it with a rotary cutter and skip the lacquer and ferric chloride steps.
Yes, you could do that; I've tried before but was unsuccessful.
It is very hard for me to make the brass flat and level to the machine. For a depth of cut in the order of 0.005" there is not much margin for error.
Than there is the cutting bit. Too large a bit and you get lines that are too wide and large radius in the corners. Small bits tend to brake. The normal procedure is to use a V bit and control the thickness of lines by the depth of cut. but for thin lines and a reasonable depth, the V angle must be steep; then the tip breaks off.
There are spring loaded engraving bits available. But too expensive for me, and I'm not sure if they perform as advertised.
See some of my tries here: https://mb.nawcc.org/threads/buiding-a-mini-tower-clock.130885/#post-1018286
On the old thread, post #48 I do some direct engraving.
Here it is:
Another enjoyable video as always Wagner. Thank you very much for sharing.
Another great example of skill and of superior planning and design.
Very nice cabinet. I tried several times to braze one similar out of brass angle but could never quite achieve an invisible joint. What is the cabinet and brass section size and what glass thickness did you use.
PS: Is there a door or do you lift it off to wind the clock?
There is a door, it is held by strings on the second and third pictures. I'm planing to fit the hinges today.
The cabinet is 17" tall, 10" wide and 7" deep.
The brass is 3/8" square. The glass 3/32" thick.
Joints by #1 screws and 1/16" pin.
I figured that if needed to lift the thing for winding, laziness would make the clock stop...
This is what I got so far:
Now a little pause for vacation
Back in April
Wow.....great job Wagner. Well done!
Still working on it
Wow, awesome work Wagner. I am almost speechless. While I have no inclination to do what you are doing, I really admire you craftsmanship.
Very nicely done indeed.
Your clock is beautiful. It is great to see it in motion. The case is a work of art in itself!
Well done Wagner!
Congratulations. Beautifully made and a lovely design. The fusee is particularly nice. I like the depthing adjustment method for the anchor.
I couldn't view your video here, but I was notified by YouTube and saw it this morning.
Your clock is absolutely magnificent!
What an incredible journey to see it from the very first steps until now. Its been fantastic to watch your progress, and to read all the excellent descriptions and comments from yourself and the other forum members.
I'm sure I can speak on behalf of the other members and say thanks for taking us on this amazing voyage.
Thank you so much for sharing this with us Wagner.