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facilities:fablab:equipment-custom:plastic_recycling:plastic_shredder [2019/11/13 11:39] pmusk |
facilities:fablab:equipment-custom:plastic_recycling:plastic_shredder [2020/03/09 17:57] Michael Byrne |
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| ====== Plastic Shredder ====== | ====== Plastic Shredder ====== | ||
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| Shredder components were laser cut by external service providers according to the design files available from the [[https:// | Shredder components were laser cut by external service providers according to the design files available from the [[https:// | ||
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| * a transparent acrylic hopper was fabricated and mounted above the exposed shredder blades, to provide added safety and increase ease of feed. A short push stick was then used to assist feed entry to the shredder. | * a transparent acrylic hopper was fabricated and mounted above the exposed shredder blades, to provide added safety and increase ease of feed. A short push stick was then used to assist feed entry to the shredder. | ||
| * the sieve screen was modified according to more recent Precious Plastics designs, with extra holes made in the shredder housing to allow the screen to be fixed in place using threaded pins, as a way to make removal and cleaning easier (see: [[https:// | * the sieve screen was modified according to more recent Precious Plastics designs, with extra holes made in the shredder housing to allow the screen to be fixed in place using threaded pins, as a way to make removal and cleaning easier (see: [[https:// | ||
| + | * DC motor was a [[https:// | ||
| + | * Gearbox was a [[https:// | ||
| ====Operational Observations==== | ====Operational Observations==== | ||
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| * the batteries seem not to hold a charge very well. It is essential to leave the machine charging overnight, up to the time of use. | * the batteries seem not to hold a charge very well. It is essential to leave the machine charging overnight, up to the time of use. | ||
| * during use the motor and gearbox get very hot. This is normal, according to advice from the suppliers. A pause is required after about 2 hr continuous use to allow things to cool down. | * during use the motor and gearbox get very hot. This is normal, according to advice from the suppliers. A pause is required after about 2 hr continuous use to allow things to cool down. | ||
| - | * the motor brushes burnt out about 12 months after commissioning. Replacements are available (about $10 a set), and spares are now kept on hand. | + | * the motor brushes burnt out about 12 months after commissioning. Replacements are available (about $10 a set), and spares are now kept on hand. (see brushes replacement below) |
| * during operation , a static charge builds up that causes fragments of plastic to stick to the acrylic hopper, and other surfaces. Regular brushing during operation can address this to some extent. | * during operation , a static charge builds up that causes fragments of plastic to stick to the acrylic hopper, and other surfaces. Regular brushing during operation can address this to some extent. | ||
| * cleaning between jobs is a major frustration. As the material is shredded, heat causes small pieces to stick to blades and screen, and smal pieces too large to pass through the screen remain lodged in the grinder. Brushing (from below) and vacuuming are only partially successful. Running the shredder for 5 min without adding new material seems to help clean things out, but carry over is always noticeable. | * cleaning between jobs is a major frustration. As the material is shredded, heat causes small pieces to stick to blades and screen, and smal pieces too large to pass through the screen remain lodged in the grinder. Brushing (from below) and vacuuming are only partially successful. Running the shredder for 5 min without adding new material seems to help clean things out, but carry over is always noticeable. | ||
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| * comparison with re-purposing an existing machine would be worth exploring, A garden shredder might do the job,for example, for a much lower cost. | * comparison with re-purposing an existing machine would be worth exploring, A garden shredder might do the job,for example, for a much lower cost. | ||
| * the motor seems underpowered. While this is constrained by using a 24V system, upgrading to 240V, and installing a 2kW motor would overcome many of the jamming and overheating problems. | * the motor seems underpowered. While this is constrained by using a 24V system, upgrading to 240V, and installing a 2kW motor would overcome many of the jamming and overheating problems. | ||
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| + | ====Inductions==== | ||
| + | Draft induction paperwork has been developed, and is awaiting approval. | ||
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| + | ====Brushes Replacement==== | ||
| + | * Disconnect Battery charger from GPO and disconnect DC motor power cable | ||
| + | {{: | ||
| + | * unscrew brushes cap and remove brushes | ||
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| + | * inspect brushes | ||
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| + | * remove inspection plate | ||
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| + | * Replace cover | ||
| + | * preplace brushes | ||
| + | * replace brushes cap | ||
| + | * reconnect DC motor and test | ||
