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Drilling Proccedure

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#1
Which way is the best to drill 4 holes for a radiator?

No think is only 2mm aluminum.

I tried on a steel case like armor.

When the hole opened and touched the behind of the screw i could see around that was steel from the hole i opened :S

any ideas?
 

sneekypeet

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#2
you mean when you drilled the case it left bits of metal on the inside of the holes?

You need to grind them off. A file, a dremmel, whatever you got, take them down smooth. A sharper drill bit at faster speeds should result in less burrs on the inside, but sometimes its inevitable.
 
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#3
yeah . theres no other way to NOT to this?


or on aluminum will not left bits of metal? because the armor case is thick steel
 
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sneekypeet

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#4
Steel is tougher and usually leaves the burrs more than aluminum will.
 

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#6
true, this is why I sugested a new drill bit (the sharper you have the less it will leave). Let the drill do the work, dont jam it through the steel, and it can be kept to a minimum.
 
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#7
i bought yesterday different thickness drill bits i got 2 4mm i think is the normal hole of 120mm fan. a quality drill works better than just a normal or not?
 

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#8
The drill itself isnt such a concesrn as a sharp bit;)

4mm bits are the exact diameter of the screws used, it may be tight getting them in.

Using a smaller drill as a pilot hole first may also eliminate the bits left on the second drilling.

Just take your time, and let the bit do the cutting; dont force it through, and you should be fine. Sometimes a slight wobble of the drill bit in the hole will "cut" those bits from underneath;)
 
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#9
when i used the screw of the fan without a screw driver the screw was inside already. no push no anything . the size is ok. you want to tell me just to use a new drill bit and just not force just let the drill do its work. done with that.

but what do u have to say if i tell u that i use new drill bit on the steel case?
but anyway i was using too much force on it.
if u dont use force it works?
 

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#10
yes the rule still applies. Steel or aluminum, either way.

If you let the bit sit and cut, it takes alot of smaller bits away. If you force it, the bit takes large cuts. When its forced in, the drill may not completely finish cutting before the bit plunges in, leaving the bits in the bottom. A bit of pressure is needed to make the bit stay in place, but as you get near the end of the hole, lessen the pressure and let the bit finish the job.
 
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#11
you can also use 2 sizes of drill bits
1 to drill the hole
second one thats larger to clean the drill hole, but not drill trough it, just to grind it
 
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#13
To make a CLEAN hole, you need to put a hard object behind the metal you are drilling. Example, get a small block of hardwood, or a spare block of aluminium and CLAMP it behind the metal you want to drill. It is the same with any material you want to drill... to stop wood splitting, you clamp another piece of wood behind the piece you are drilling. Same goes for metal. Use either hardwood, or a soft metal like aluminium behind the piece you are drilling. Remember to clamp it HARD and FAST so there isnt even a fraction of a millimetre of movement.

THEN, using a good quality drill (cheap drills cause a problem because they dont have the torque and can slow down or jam) and a sharp drill bit DESIGNED FOR THE MATERIAL YOU ARE DRILLING (dont use a wood drill bit, or stone drill bit, on metal. Buy the most expensive METAL drill bit you can afford).

Better if you can use a stand drill. http://images.google.co.uk/images?hl=en&source=hp&q=stand drill&um=1&ie=UTF-8&sa=N&tab=wi

You will have a perfect hole without burrs.

If for any reason there are slight burrs, get a bit mounted wire brush http://www.arro.ie/B-DX36040.jpg. Put it in the drill and now "brush" the wrong side of the hole. Now you really have a perfect hole.
 
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#14
there's nothing quite like practising it yourself though. we may give you all the advice you will ever need, but you have to try and see what works. yes, you WILL get burrs. yes, you might use the wrong size drill bit and get a bigger hole; it's all about doing and seeing the results. if you can practice on scrap metal and wood, then do it. the more confident you are in doing something the better the end result of what you're trying to achieve. good luck