Adrian,I can suggest we look at photo etching the part. It is a process well suited to this kind of part. I use a lot of photo etch on my 1/700 scale models.
We would end up with a brass or stainless steel part which I think will work quite well, and it is relatively easy to do the artwork for. You can even do it in MS paint if you like.
We would etch a whole sheet of these guys at once, so it gets around the issue of machining them and fettling them.
Many thanks for sharing the idea of photo etching Adrian, that looks VERY promising!
A couple of questions from myself (some already been mentioned):
- is the whole process that we would consider subtractive, or would there be an additive manufacturing step as well?
- what material thickness could we use?
- is the technique suitable for creating "3 dimensional" objects?
- what would the polishing step be? From what I gather from the picture you shared, the manufactured wheels would need to be cut from the sheet and then some finishing steps applied?
Hi Adrian,OK, I have the drawing that Hermann has done plus some of the original parts. I have a drawing capability, so I'll get it drawn up.
On the maximum thickness being half of what we need, this isn't a showstopper. What I'm thinking we could do is bond two of the parts together. That's the way a lot of photo etch kits get a thickness, and laser cutting as well. This could be done with perhaps two small dots of epoxy.
In conjunction with that, I wonder if laser cutting (and even photo etching) can produce a smooth and circular inner wall on the part? And if not, what if we re-designed the corrector gear so that the basic shape is not annular with 4 teeth sticking out, but rather something more along the lines of modern cannon pinion driving wheels, in regards to the arms that create the tension and allow slippage. See a picture here of this kind of part disassembled:On laser cutting, I've been thinking about that as a possible avenue as well. There are now some high precision cutters around that are fairly low on heat, making very small parts possible (I used to work for one but they can't do what we want).