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How to clean dremel bits?? Answered

Can anyone help me clean my dremel bits? I recently bought a grinding set for my dremel to use on my Traxxas car. After using it on the plastic chassis most of my grinding and sanding bits are covered in plastic. The reason is because the plastic heats up when I use it and the plastic melts onto the grinding stone. I thought of maybe using a lighter to maybe melt the plastic off but it just burnt the plastic and a bit of the stone. It's not that the bits are expensive, I can afford $2 but the gas to go the hardware store is just too much for a couple of bits. I would just use my bike here and there, but it just becomes a hassle go over there every hour. Thanks


Sounds like your using the wrong speed. Most stone bits i've used have been primarily for metals and ceramics. You will want to us a bit meant for plastics. If your dremal doesn't have speed control then take it slower and allow the plastic time to cool. Dip it in cold water if you need too. But once the plastic gets ingrained with the stone there is no getting it out short of using another stone to grind the first down enough so your past the plastic mess.

By all means then, can you suggest the right bit then? My dremel only has 2 speeds on it. It is Dremel brand, for most things I use the highest setting (second option) over the lowest speed (first option) because if I use the slow setting it just ends up kind of rubbing against the material and not grinding it.

Plastics are difficult to work with. Are you using these bits to take out large chunks of the plastic or just clean up the edges?

If your only taking off some small edges then use the sand paper bands and disks. You can find them in packs of 6 or more and even generic brands will work. When they get gummed up to the point of not working anymore you just slip on a new disk/band and keep going. This way you can stock up on them and not have to make allot of trips.

As Burf suggested you can use a dental pick to try and get most of the plastic off or even try a wire brush to help extend the life of the bit but ultimately it will have to be replaced. Also like he said lubricate the bit before you use it.


5 years ago

Most any bit or stone is sharp relative to soft plastic but plastic gums up the cutting surfaces. Also, the duller the cutter, the more heat is generated, causing the edges to melt at high speed. You need to be able to play with different slow speeds to find the right mix of speed.

Use the dressing stone to clean stones or wheels. But avoid using stones or wheels, they will foul quickly, and to cleaning them with the dressing stone will wear them down.

Try to get most work done with bits, cutters and cutting wheels, Cutting wheels are self renewing, use the thinnest one, bits and cutters can be cleaned easily with a Dremel wire brush, brass is preferred to avoid scouring them, use the slow speed that gets the job done quickly, and wear due to cleaning is negligible.

Do not use water as a lubricant, at most WD40 or oil, to avoid shock. Lubricate the work surface not the bit lubricate on bits and cutters. Use it very very sparingly. Lubricants will be wicked up the shaft as it rotates, and could enter and foul the bearing.


5 years ago

For the steel cutting bits I use an old dental pick or a large needle and scrape/chip out the foreign material. For the grinding stones, use the little black abrasive dressing stone that comes with most Dremel sets. For everything else, a brass wire brush generally does the job.

In the future, before cutting plastic, give the steel bits a quick squirt of WD-40 and wipe off the excess. It helps reduce the amount of plastic that sticks to the bit.