February 7, 2022

Do Dremels Overheat

Yes, Dremels get hot when spinning at 5,000 to 35,000 RPMs. Even if you use it for a short time, when it gets to 10,000 – 15,000 RMPs, do not be surprised when it gets hot. Do not block the vents. If the Dremel is overloaded, it will burn itself up, and the accessories can burn out quickly as well if pushed. That leads to a breakdown if you continue using it.

Common causes for Dremels overheating.

Dremels overheat due to blocked vents and prolonged use. It might be smoking due to technical fault on some parts and excess pressure. Overworking the Dremel can cause the tool to break down, burning out. Make regular checks when it comes to the motor. If there is damage and continuity, remove the Dremel motor.

When your Dremel, the motor overheats, ask to do something like mixing mortar. You would have asked your tool to do something beyond its capabilities. To fix it, upgrade the Dremel tools if you want to keep doing that thing.
If your tool bit is dull, the Dremel needs to work harder to cut through wood. It happens when trying to cut through hardwood. Check if you are working with a dull bit, replace the bit with a new bit, and see if the problem goes away. If yes, then the problem was the bit.

If you look on the side of your tool, there are air vents. That is where the smoke comes from. Like any vents, these get clogged when they have been around plenty of sawdust. This causes hot air to be trapped by the motor, which will help the Dremel motor overheat. These include a blow-dryer.

Preventative measures

  • Take air in a can or an air compressor and blow into every opening of the tool.
  • Replace the brushes.
  • Replace the cooling fan.
  • Keep a knitted elastic band of the sock near, but not covering, the fan exhaust holes. You will see the Dremel sock that captures dust inhaled into the tool at the lower end. It keeps the Dremel tool running cooler for a longer period.
  • When cutting metal, use cutting oil to decrease friction and thus reduce the amount of heat generated from the tool.
  • Keep the temperature of the tool in check. Carving and engraving on glass might heat the bits.
  • Check and replace your brushes.

What to do when Dremel overheated and stopped working

Assess the situation

First, unplug the tool And assess the situation. Check to see if the shaft spins freely. If it does not, you have a problem to fix. If the bearings are bad, the whole armature will need replacement. You can free up a bad bearing with light oil, but noisy bearings mean mechanical damage.

Your Dremel tool might come out while the other separates from the spring and remains in the brush holder. If it does, next check the brushes. These are small blue screw caps on the tool. They should be removed easily and have more carbon bricks left.

Start disassembling the tool.

Remove the hanging clip and the body screws. These differ in size. Separate the body halves making sure that no small parts fall out, like the shaft lock assembly at the nose of the tool. Remove the motor assembly from the body, make sure which side is up concerning your dis-assembly order.

Remove the rubber spacer at the rear of the motor shaft and pull the brush block assembly rearward to remove it. Remove the hanging clip and the body screws. Separate the body halves making sure that no small parts fall out, like the shaft lock assembly at the nose of the tool.

Remove the motor assembly from the body and the rubber spacer at the rear of the motor shaft. Pull the brush block assembly rearward to remove it.

Start with repairs

Use a rounded tool like a screwdriver shaft and push the stuck brush out of the brush block. Check for damage. Sometimes there is none, and you will be able to re-use the Dremel brushes and brush block. Dress any warped or melted plastic with a needle file or sandpaper.

Reattach the spring to the brush using force. Test for proper fit by inserting the Dremel brush to avoid binding. Sometimes the heat was caused by a dirty and worn commutator. The Dremel brushes would have contacted the rotor, which in turn causes the Dremel brush to melt into the carrier.

Use fine sandpaper (800 grit), clean, and dress the commutator until shiny and smooth. Clean the black lines between the parts of the commutator using a brass brush to remove shorting.

Reassemble the tool

The brushes go in last and worn brushes should be replaced. Press them into place. The brush holder connects to the motor assembly through friction fit contacts. Reattach the rubber spacer to the rear bearing and place the motor into the housing.

Place the other half of the housing in place and test that the motor freely spins. If it grinds, open the case and flip the magnet assembly of the Dremel motor over and re-install. It has to be smooth now.

Screw the case shut.

Look for a dark line on one edge of the brushes. When you get it, install it in the direction of the arrow—the dark line in the direction of travel. Install the brush caps. Plugin the tool and test if it does not spin. You have a burned-out switch. That will need to be replaced, and the Dremel switch is available online at different prices. It starts working better than ever.

Using Dremel Warranty

Dremel has a 2-year warranty that offers a guarantee for Dremel power tools. Your warranty claim is on your sales contract with the retailer.

Dremel multi max stopped working: What to check.

Check all the parts. Start with the motor. First, unplug the tool. Check to see if the shaft spins freely. You may have a bearing problem. Light oil can free up a bad bearing, but noisy bearings mean mechanical damage. If the bearings are bad, the whole armature will need replacement.

Thermal fuse for Dremel 3000

The Dremel 3000 Rotary Tool does not have a thermal cut-off switch. It has motor brushes and checks these brushes every 20-30 hours of usage. The chances are low that it will shut off when it gets hot from long periods of use.

Dremel switch repair

  1. Switch off the Dremel tool
  2. Remove the blue caps and the carbon brushes.
  3. Pull out the hanger.
  4. Remove screws and the chuck cap.
  5. Remove the black housing cap.
  6. Lift the motor shaft.
  7. Remove the rubber ring.
  8. Remove two wires on the back of the switch by connecting the cord to the Dremel switch. Insert a small metal pick into the hole next to the wires and pull the pick and the wire out together.
  9. Insert the wires into the new switch making sure the white wire is attached to the left-hand side. The black wire is attached to the right-hand side when the power switch is facing up, by pushing the wires in with your hand.
David D. Hughes
Latest posts by David D. Hughes (see all)

Leave a Reply