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Original file line number | Diff line number | Diff line change |
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Three type of conveyor ends have been used successfully: | ||
Motor end in ¾” MDF | ||
Pulley end in ¾ MDF | ||
Pulley end in ¼ MDF | ||
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These pulleys built from ¾” frames have turned out way better than I thought they would. I first used 1mm thick belting at 100RP; this was a bit under powered. All the power is used to move the thick belts. It would move a full gallon of milk with no issues. | ||
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With the 0.15mm thick belting that is currently be used the motors can be smaller, especially if you put in ball bearings. | ||
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Motor end in ¾” MDF Parts: | ||
25MM Gear motor, 4mm shaft 100-1000RPM | ||
2 motor mount screws: M3-0.5 6 mm screws | ||
3D printed gearbox bracket | ||
3D printed D-coupling to take motor 4mm ID “D” to ¼” OD | ||
Coupling: Polyurethane Tubing, ½” OD, ¼” ID. | ||
Coupling: Zip/cable Ties: 4” | ||
75mm long ¼” steel shaft | ||
35 mm long 3D printed pulley. 22mm diameter. | ||
Drilled with “D”0.246” drill to press fit on ¼” shaft | ||
2 3D printed Pulley Holders. | ||
2 Bushings: stock nylon shoulder spacers ½” Long, ¼” ID, 5/16” ID, ½” ID Flange | ||
3 8” zip/cable ties hold on the gearbox bracket & pulley holders | ||
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Pulley end in ¾ MDF | ||
Same as motor side, except 60mm long shaft. | ||
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Pulley end in ¼” MDF: | ||
Pulley end ¼” is 60mm wide | ||
1/8” steel shaft, 60mm long | ||
4 ¼” diameter nylon spacers, 1/8” hole, ½” long, Center spacer has tape to make it crown. | ||
Wood is cutout for the pulleys | ||
Remaining wood is drilled 1/8” | ||
It’s pretty crude and fragile, but once it starts working I have yet to see fail. | ||
It’s easy to drill so the shaft is not straight. Then the belt walks to one side. | ||
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Conveyor Belt: | ||
30mm wide, 0.15mm thick Polyurethane | ||
Normally used for sealing fabric together, under garment strapping, etc. | ||
Sold as “TPU Tape” on Aliexpress.com | ||
Length wise sized 5% under | ||
Bonded together with a standard impulse heat sealer used for sealing poly plastic bags. | ||
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Speed Controllers: | ||
The first proof of concept had 24V power stepped down to 5 to 18 volts for the 12V motors with DC-DC LM2596 modules. This are really common, $1-2 on eBay, Amazon, etc. The system moving coins with motors running at 5-7 volts is surprisingly quiet with the coin hopper turned off. |
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