| General > General Technical Chat |
| Sharing some project planning phase: A (digital) ELECTRO-MECHANICAL Network |
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| RJSV:
Here is picture, you can see, where two metal screws are:. It's possible to use nylon fasteners, for in-service use (prototype has some shortcuts). |
| RJSV:
Getting pretty exciting, watching my prototype switch box get assembled, for first time! This 3PDT Mechanical Switch (rotary activated transmission really) is approx 2 X sized, and main 'test' involves that moving piece: the toggle lever. See in photo, the little screwdriver on top the box indicates the 'toggle lever'. These cut-out ports you see are for access in assembly and visual confirmation. That toggle lever arm might be required to be a different length, or need a wider swing. But the box construction itself ends up fairly aligned, as those various shafts, (3 parts, for channels 'A', 'B', and 'C') look aligned, decent. We are talking very low accuracy, perhaps +/- 1 mm in critical parts... The upper shafts, those don't actually exit the box, as those are stationary axels for each of the 3 SPDT arrangements. (You only see 2, because the 'C' channel switch subsection is behind the other two, and so it shares the upper stationary shaft, (with 'A' portion). Mainly, I'm interested in debug the toggle lever sizing (in photo, that toggle lever moving part is just a scrap piece, for confirming things fit...so far. I've now gotten rubbed oil finish, outside, some extra glue, in loose spots, and some nice, yellow highlight paint, on the sides. Generally, the 'face' in the photo, is considered the output plate: 3 outputs are the 'BUS CHAIN' 1 output is 'local BUS control...i.e SELECT to next box and 1 output will be the actual, locally available ' CLIENT' signal, for doing custom things, such as winding or un-winding a bobbin, for simulating a node, in a serial string of (these) boxes. |
| RJSV:
Here is another view, of the 3PDT switch. |
| RJSV:
...maybe hard to see, in there, without contrasting color, but the mock-up 'toggle lever' is mounted on the right side stationary 'axel' wooden dowel rod. The toggle shown with downward tip 'selecting' the left side, although incomplete as it's going to actually be (rubber) wheel to wheel contact, selecting either the left or the right side (for output from the switch box). Generally, in the serial string network, four output shafts connect, on down the line, to each next 3PDT switch box. That's considered 'transparent' state, where the local output is not controlled. |
| coppercone2:
The friction scaling problem seems frustrating, to get the best alignment you would need to get a fly cut or better plate, drill holes with a jig borer, temper and ground, then size the holes properly with a jig grinder and use machine pins for the elements, using thermal fitting to seat components. I am just posting because I am kind of wondering what it would cost to make this design in a high precision variant. It also seems that its something you can get partially manufactured in a gear-box shop, or a spline shop, there are still manufacturers of precision scientific grade gear-boxes BTW. It would be a non standard custom job.. but I was kind of wondering what the cost would be. I know thats not your objective but I find it interesting to think about how it would perform if you had this going with moly-d on precision ground gears. I think this construction would ultimately give the lowest friction that can think of with my limited knowledge of gears. Here is a 3d-printed 11 million to 1 gearbox someone made (crazy amount of slop, but it does function!) Those videos might help you size up your friction problem more accurately, if it does exist, since those are 'cheap' designs. |
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