To put a sanding disc on a sander, follow these general steps. The exact method may vary slightly depending on the type of sander you are using (e.g., orbital sander, belt sander, etc.), but here’s a basic guide for an orbital sander, which is one of the most common types:

For an Orbital Sander:

1. Unplug the Sander: Always ensure the sander is unplugged or turned off to prevent accidental activation while you are changing the disc.

2. Remove the Old Disc: If there is an old sanding disc attached, remove it. Most sanding discs are either hook-and-loop (Velcro) or adhesive-backed. For hook-and-loop discs, simply peel it off. For adhesive discs, you may need to gently pry it off.

3. Clean the Pad: Before attaching a new disc, check the sanding pad for any debris or residue. Clean it if necessary to ensure a good bond with the new disc.

4. Align the New Disc: Take your new sanding disc and align it with the holes on the sanding pad (if applicable). Make sure the holes on the disc match up with the dust collection holes on the sander for optimal dust extraction.

5. Attach the Disc:

For Hook-and-Loop Discs: Simply press the disc onto the sanding pad, ensuring it adheres securely.

For Adhesive Discs: Peel off the backing paper from the disc, align it with the sanding pad, and press it down firmly to ensure a good bond.

1. Check Attachment: Make sure the disc is securely attached and that there are no wrinkles or bubbles.

2. Plug in the Sander: Once the disc is securely attached, plug the sander back in or turn it on.

3. Test the Sander: Before starting your project, turn on the sander briefly to ensure the disc is spinning correctly and is securely attached.

For a Belt Sander:

1. Unplug the Sander: Ensure the sander is unplugged.

2. Release the Tension: Most belt sanders have a lever or knob to release the tension on the sanding belt. Follow the manufacturer’s instructions to do this.

3. Remove the Old Belt: Slide the old sanding belt off the rollers.

4. Install the New Belt: Place the new sanding belt around the rollers, ensuring it is oriented correctly (the direction of the grain should match the sander’s direction of travel).

5. Re-tension the Belt: Once the new belt is in place, re-engage the tension mechanism to secure the belt.

6. Check Alignment: Make sure the belt is aligned properly on the rollers.

7. Plug in the Sander: Once everything is secure, plug the sander back in.

8. Test the Sander: Turn it on briefly to ensure the belt is running smoothly.

Always refer to the user manual for your specific sander model for detailed instructions, as there may be variations in the process.