Introduction: Powerful Pocket Sized Rotary Tool
I love my Dremel, but sometimes I wish it was smaller. I started looking around for a cheap, small rotary tool and found an oldDremel 7700-1/15 MultiPro Cordless at a garage sale for $8.00. Unfortunately, after about a month or two of use it the battery started to die. Rather than buy a new battery pack for it I decided to seize the opportunity and make an even smaller Dremel. At just over 4 inches it is about 2/3 of the length and the same width of the smallest rotary tool I could find online, the Dremel 754-04 4.8V MiniMite, and it provides 1.5 times more power.
Disclaimer: this could potentially destroy your rotary tool. I have only done this on the Dremel MultiPro Cordless, I don't know what will happen with other brands or tools.
Step 1: What You Need:
- Rotary tool
- Old rotary tool to cut up
- Whatever rotary tool heads you need to get the old tool apart
- Soldering Iron
- Electrical tape
- 2 neodymium magnets (optional)
- 9v battery snap
- 9v battery
- Voltage regulator (depends on the voltage your rotary tool requires)
Step 2: Taking Apart the Rotary Tool
- Carefully break apart the old rotary tool to expose the motor and shaft that holds the bits; that is what we want
- Check the voltage required by the rotary tool; this will determine the voltage regulator you buy
- Purchase a voltage regulator that has an output close to the voltage required by your rotary tool; I got mine at Mouser Electronics
Step 3: Making the Circuit
- Solder the battery snap, voltage regulator, switch and motor together like in the picture
- Add the battery and test it out
Step 4: Finishing Up
- Use a small amount of glue to hold the battery in place and tape around it
- Use a small amount of glue to hold the switch to the battery and tape around it
Adding the Magnets (Optional)
- Take the 2 magnets and place them on the sides of the motor
- Tape over the magnets
- You can use the magnets to hold spare bits
We have a be nice policy.
Please be positive and constructive.