1368Views8Replies

Author Options:

How do I clean my Aluminum Oxide bit for my Dremel? It has a coating of metal on the side.? Answered

I was probably using my dremel wrong, but my 932 bit has a coating of metal on it after I used it to enlarge a hole. (I ground using the side of the bit). How do I remove this coating of metal?

8 Replies

user
cerberustugowar (author)2013-03-17

I may not be reading in to this enough, but it sounds like you used a soft metal on a bit that is meant for a harder material. You may be able to re-dress your bit by using an aluminium oxide dressing tool (like the square block, or maybe with a wheel dressing tool like the red one in the picture. http://www.micro-machine-shop.com/grinding_wheel_dressers.jpg . Or possible this is all overkill and it's just better to buy a new bit and if you need to grind a soft material, buy the appropriate bit.

Select as Best AnswerUndo Best Answer

user

What bit should I be using for a material like softer metals?

Select as Best AnswerUndo Best Answer

user

I would think your best bet for enlarging a hole (besides re-drilling it) would be a carbide burr. We use them at work (although it's in a 1/4" die grinder) and regularly use them on aluminium and steel. Another ideas may be to try those small sanding drums they have. Hope this helps in leading you to a solution.

Select as Best AnswerUndo Best Answer

user
rickharris (author)2013-03-18

For the cost of these tools - Buy a new one.

They are hardly worth the effort to reclaim them.

Although using a power tool seems like the easy choice often softer materials are better handled with hand tools such as files which can easily be cleaned.

Select as Best AnswerUndo Best Answer

user
steveastrouk (author)2013-03-18

I deleted my comment about etching, I assumed you'd used a toothed cutter too fast.

Grinding is only suitable for hard materials - or the wheel clogs...

On soft materials, you need a cutter with real teeth, usually called a "burr"
This range is suitable
http://www.dremel.com/en-us/Accessories/Pages/SubCategories.aspx?catid=2070&catname=High+Speed+Cutters

KEEP THE SPEED DOWN, and ideally lubricate the process slightly, using mineral spirit and a bit of lubricating oil.

Select as Best AnswerUndo Best Answer

user
Burf (author)2013-03-17

Use the dressing stone that comes with most Dremel kits. Its a black, square carborundum stone about 1/2" square and an inch or so long.
Chuck the grindstone in your tool, turn it on and hold the dressing stone against the grindstone. It abrades away a little of the grindstone until the metal clogging the stone is removed.
In the future, use one of the steel cutting bits for shaping soft metal.

Select as Best AnswerUndo Best Answer

user
alfonzo1955 (author)steveastrouk2013-03-17

American Nickel, so 25% nickel, 75% copper

Select as Best AnswerUndo Best Answer