Chris Ball has mentioned a project that might raise us some cash for the new CNC
Large version of this
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Linear distance to travel being scaled to 2 feet (0.6m)
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The following are guesses: Wood or plastic, with metal shafts, driven by a 12v motor of some sort,
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Hi all, budget is £200 just to make the gears and rack from plywood. No other fixings required.
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does not need to move fast (maybe 2 oscillations/mins) so gearboxes required
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Timescale: Non-urgent I believe, by the end of the year would be nice
- The motion of travel should be around 0.6m or 2ft
- The scale of the gears is based on the svg from Phil C
- The tooth profile's has been redone using GearTrax
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Not sure of the thickness of ply to use, currently assuming 8mm thick with 8mm threaded rod / nuts / washers etc Holes are sized at 8.1mm to give a bit of clearance when turning instead of sticking
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There's no endstops on the centre back gear or the centre Rack I suspect these can be glued on / screwed on and may need tinkering a bit to get them in the right place.
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There's no bearings on the gears currently. If they're added we'll need to think about how to add them in
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There's no support / hold for the rack a simple bracket might get caught up with the tooth's on the rack, so maybe a piece of straight metal rod and some cheap linear bearings might do the trick
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There will need to be an arrangement for a geared motor on the back, and power supply perhaps something like this https://www.ebay.com.au/itm/GW370-12V-6rpm-Reversible-High-Worm-Geared-Motor-Torque-Turbo-DC-Motor-35A-Y2E7-/253179099572 not sure of the rpm's needed