Tyre Truer MKIII for slot cars 1/32

thingiverse

This is a detailed guide on how to assemble and use a DIY slot car tire grinder. Here's a summary: **Tools Needed** * Metal shafts (dia. 6 mm) * Drill bits (2, 4.9 mm, sharp) * M3 tap * Files * Sand paper * Screwdrivers * Soldering iron * Bench clamp with soft jaws **Assembly** 1. Connect the spindle holder to the main body using a 68 mm long shaft. 2. Insert the pivot pin #1 into the main body and screw it in place with an M3 40mm long screw. 3. Insert the pivot pin #2 into the spindle holder, making sure it is aligned with the screw. 4. Add two M3 nuts to hold the screw in place. 5. Press-fit the bearings by hand or with a bench clamp. 6. Insert the 78 mm long shaft into the bearings and spacers. 7. Move the sanding roll aside to access the locking grub screw. 8. Insert the motor into the body and solder the cables. **Grinding Process** 1. Superglue the bushings into the spindle holder seats. 2. Add covers and pulleys. 3. Install the tyre spindle with a couple of aluminium retainers and grub screws. 4. Glue the tyres to the hub (optional). 5. Apply a step-by-step grinding process, checking the diameter of the tyre regularly. 6. Use sandpaper to refine the texture of the tyre. **Tips** * Do not use excessive force between the spindle and the grinding wheel. * Take regular breaks to check the progress and measure the diameter of the tyre. * Round the tyre's edges while grinding. * Refine the texture of the tyre with fine sandpaper (120 grain). **Safety Precautions** * Work carefully and avoid applying too much pressure on the grinding wheel. * Do not hammer the shafts into the bearings, as this can damage them. Overall, this guide provides a detailed step-by-step process for assembling and using a DIY slot car tire grinder. With careful attention to detail and safety precautions, you should be able to achieve good results with your homemade grinder.