Gantry
Documentation for the FarmBot Genesis V0.8 Gantry
Change Log
- Plates are now 5mm thick and screws lengthened appropriately
- Addition of stainless steel washers between nuts and plates to improve connection and reduce wear on the plates.
- 3D printed cable carrier and driveshaft brackets now have a gusset to prevent deformation due to day/night heat cycling
- Pulley and flex coupling set screws are now stainless steel
- Driveshaft and driveshaft bearing are now stainless steel
- V-wheel bearings are now stainless steel
Photos
Bill of Materials
| Part Name | Description | Source | $/unit | Qty. | Subtotal |
|---|---|---|---|---|---|
| Main Beam Aluminum Extrusion | 1.5m long 20x40mm V-Slot aluminum extrusion for spanning the width between the tracks | OpenBuilds | $19.50 | 1 | $19.50 |
| Gantry Corner Plates | 5mm thick aluminum plates to attach the vertical columns to the main beam | Big Blue Saw | $5.00 | 2 | $10.00 |
| Vertical Columns Aluminum Extrusion | 500mm long 20x40mm V-Slot aluminum extrusions | OpenBuilds | $6.50 | 2 | $13.00 |
| Gantry Main Plates | 5mm thick aluminum plates to attach the V-wheels to the Vertical Columns | Big Blue Saw | $15.00 | 2 | $30.00 |
| Complete V-Wheels | Includes one polycarbonate wheel, two stainless steel rubber sealed ball bearings (16mm OD, 5mm ID, 5mm thick, trade name: S625-2RS), and one precision shim (10mm OD x 5mm Bore x 1mm thickness) | FarmBot Shop | $10.00 | 8 | $80.00 |
| 6mm Aluminum Spacers | 5mm bore, for offsetting the V-wheels from the plates | OpenBuilds | $0.20 | 6 | $1.20 |
| 6mm Eccentric Spacers | For adjusting the distance between the V-wheels | OpenBuilds | $2.00 | 2 | $4.00 |
| M5x30mm Screws | Stainless steel type 316, 0.8 thread pitch, low-profile 3mm hex heads | FarmBot Shop | $0.60 | 8 | $4.80 |
| M5 Locknuts | Stainless steel with nylon insert, 0.8mm thread pitch | McMaster Carr | $0.08 | 12 | $0.96 |
| Gantry Motor Mount Plate | 5mm thick aluminum plate to attach the gantry motor to the vertical column | Big Blue Saw | $5.00 | 1 | $5.00 |
| NEMA 17 Stepper Motor | Dual 5mm shafts | $30.00 | 1 | $30.00 | |
| NEMA 17 Cable | 0.5m length | 1 | |||
| Rotary Encoder | Differential output, 200 line/rev minimum, 5mm bore | $50.00 | 1 | $50.00 | |
| Rotary Encoder Cable | 0.5m length | 1 | |||
| Motor Housing | Waterproof 3D printed plastic | Shapeways | $30.86 | 1 | $30.86 |
| M3x10mm Screws | Stainless steel, for attaching the stepper motor to the mounting plate | FarmBot Shop | $0.30 | 4 | $1.20 |
| GT2 Pulley | Aluminum, 20 tooth, 5mm bore | OpenBuilds | $5.50 | 2 | $11.00 |
| M3x5mm Setscrew | Stainless steel, knurled end, two per GT2 pulley | McMaster Carr | $0.30 | 4 | $1.20 |
| 5mm to 5mm Flex Coupling | For attaching the stepper motor to the drive shaft | Adafruit | $4.95 | 1 | $4.95 |
| M4 Setscrews | Stainless, for the Flex Coupling | ||||
| Driveshaft | Stainless, 5mm diameter, 1.5m in length | McMaster Carr | $32.68 | 1 | $32.68 |
| Driveshaft and Cable Carrier Brackets | 3D printed plastic | Shapeways | $10.55 | 6 | $63.30 |
| Drive Shaft Bearing | Stainless steel, rubber sealed, 16mm OD, 5mm ID, 5mm thickness. (S625-2RS) | FarmBot Shop | $4.00 | 1 | $4.00 |
| Drive Shaft Lock Collars | 5mm ID, they capture the drive shaft bearing in place | OpenBuilds | $0.90 | 2 | $1.80 |
| Drive Shaft Bearing Plate | 5mm thick aluminum plate to hold the drive shaft’s bearing | Big Blue Saw | $5.00 | 1 | $5.00 |
| M5x10mm Screws | Stainless steel type 316, 0.8 thread pitch, low-profile 3mm hex heads | FarmBot Shop | $0.40 | 34 | $13.60 |
| Tee Nuts | Stainless steel, for attaching M5 screws to OpenBuilds aluminum extrusions | $0.30 | 30 | $9.00 | |
| Cable Carrier | 1.5m length, 15x40mm | Inventables | $38.25 | 1 | $38.25 |
| Cable Carrier Mounting Brackets | 3D printed plastic | Shapeways | $9.99 | 2 | $19.98 |
| GT2 Timing Belt | 1.6m | Alibaba | $1.33 | 1.6 | $2.13 |
| Total | $486.53 |
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