Marble Exercising Machine - Overview
Description
Don't want to lose your marbles? Then keep them fit and happy with this Marble Exercising Machine! Before we start, a few cautions. Firstly, this is a 'large' model consuming about 5kg of filament (including supports), and takes about 50 days (yes, days!) of continuous printing on the Ultimaker 3 (which is not renowned for speed). Secondly, it needs a dual extruder printer that can print dissolvable support material (PVA on the Ultimaker) and can co-print a flexible and a rigid filament - I used TPU95A and ABS on the Ultimaker. Thirdly, whilst I started with the intention of keeping the print area to 150x150mm, some items have strayed over this size. Fourthly, the model has exposed moving parts which present a trap hazard, and contains small parts which could be swallowed, so care needs to be taken if children or pets are present. The model is designed in a 'Heath-Robinson' manner, so simplicity was not a goal. Since everything needs bells and whistles, it is complete with a bell (1/8 scale approximation of the bell from ss Braga) and a whistle (1/10 scale simplified version of the steam whistle from ss East Point). The model is based on 12mm (or half inch) steel ball bearings. About 40 are needed to 'populate' the model in operation. I printed most of the model with PLA, but used Ultimaker 'tough PLA' for the cap and thumb screws. Please feel free to use your own materials and colours - but the rainbow ramp benefits from rainbow colours. The model uses 3mm and 2mm diameter steel rod for axles etec, to keep friction down. See the file "rods" for a list. The model uses a 12v 50rpm electric motor. This can be sourced on Ebay etc - search for "XD-37GB520 Brushed Geared Motor DC 12V 10W 50RPM CW/CCW Gear Motor". Cost about £9 from China. The model can be powered from either batteries or a 12v PSU. A PSU is recommended for all but short run times, but batteries are useful for testing during assembly. I used a battery box sourced from Ebay, "1Pcs 10 AA 2A Battery 15V Clip Holder Box Case Storage w/6" Wire Leads Black". Cost about £1.50. Plus ten AA NiMH batteries. Or a 12v PSU with a centre positive 5.5mm x 2.5mm DC plug, cost £5 to £12. Also needed is a 5,5mm x 2.5mm DC plug and socket, and some two-core LV wire. The project is broken down into a number of parts to make it more manageable: 1. This overview - includes common components (screws, gears etc) 2. Base 3. Motor and electrics 4. Gear train 5. Open Archimedean screw 6. Bucket wheel & hopper 7. Closed archimedian screw 8. Piston engine 9. Bell spinner 10. Bucket lift 11. Wheel wall 12. Rainbow ramp 13. Railway bridge Note that the build list (pdf) is based on how the project was designed rather than how it is best assembled, and so components may appear under different parts. Eg, the half rpm shaft of the gear train is assembled with the open Archimedean screw.
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