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| Colin Thorne's - Skeleton Timepiece |
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| raynerd:
I`m cheesed off, I`ve just taken a nice video of me cutting the wheel with my new CNC rotary table and the damn file won`t open! It says the file is corrupt or different format. All the other videos will open so I haven`t a clue why this one won`t! Anyway, it’s not as exciting but here are a few pictures and it is much more successful than last! I`m really pleased. Here is what has changed since my last attempt: 1. Clockmakers CZ120 engravers brass, I would never bother trying with soft brass again!! 2. A new sharp hardened cutter 3. My new CNC rotary table which worked a treat! I`m really pleased. I`m going to re-do it as I still feel the teeth are a touch spiral which indicated my cutter was not centre. I spent a good 10 minutes eyeballing this centre with a dead centre in the rotary table and locking the Z-axis to position. I`m certain it was centre so I need to work out what was wrong, perhaps the cutter is not sitting parallel? It could possibly run as it is only a fraction out and barely noticeable but I think I`ll go for a re-make. Just need to figure how to get this bob on centre height. These pictures are still on the rotary table with the teeth just cut. They have since been dressed and cleaned up. The difference is the flakes that are still on the photos just flick off and rub off with fine paper where as with the soft brass in my last attempt at cutting, the brass flakes left behind were smudged and could not be cleaned. I`m not going any further with this wheel yet as I would prefer to start over a fresh but I`m confident the tooth profile is OK so the cutter seems a success. Chris |
| raynerd:
The thread to my CNC rotary table conversion is here: http://madmodder.net/index.php?topic=2242.0 it was built primarly for this project and seems like it is going to work perfectly. Chris |
| sbwhart:
Nice going Chris. A height gauge may help you get the tool at the correct height, this is how I got the key way tool set for a pulley I was making. Hope this helps. Stew |
| andyf:
I still reckon that, if you are cutting each space to full depth before moving round (for example, clockwise from your viewpoint) to cut the next, the brass on the left side of the space you are cutting will be better supported than the brass on the right of it (because you have already cut a space on the other side of the brass to the right, whereas there is no space to the left). Thus, the stresses of the cutting might be causing the brass on the right to bend over a little into that existing space, giving the spiral effect. Andy |
| Darren:
I think Andy has a good point ..... you are coming on well there Chris ... :clap: |
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