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 Posted: Mon Feb 18th, 2019 08:51 am
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Passed Driver
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Hi All.   Drilling Alluminium and the drill bit starts to wobble, no it’s not me, I don’t believe it , the drill is folding Screwfix “ was the store that I went to . I wouldn’t mind but I am drilling a lightweight material, taking it steady, not giving it any welly.  Another day goes by when progress is halted. If I cannot depend on “ We are here when you need us “? Where on Earth do I go to purchase good quality Gear. Can anyone please advise me.  Best wishes Kevin 



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 Posted: Mon Feb 18th, 2019 09:22 am
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Dont buy unbranded drill bits if you require good quality drill bits buy De walt , Bosch , makita, Ebauer they  are all sold at screwfix drill bits are like most things you get what you pay for.
I assume you have bought Metal HSS drill bits and not purely wood drill bits?
Also if you are using very small drill bits are you using the correct actual drill for small bits even the best bits will bend if your using a far to big heavy drill applying to much pressure.
Also remember the bit is a cutting tool not a punch so you should not be applying to much pressure anyway.
And in the past i have seen people moaning the drill is not cutting well only to find they are actually running it in reverse.
Brian



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 Posted: Mon Feb 18th, 2019 10:33 am
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Brian is spot on, you get what you pay for. Use branded HSS bits for soft metal, cobalt  or titanium bits for hard (including hard brass and hard brass alloys) slow speed (300-500 rpm, not the Dremel!), and a drop of cutting oil to prevent overheating. Light pressure at all times. If the tip gets blued because the metal is too hard and it overheats it is toast. Use a punch to center the bit.

Nigel



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 Posted: Mon Feb 18th, 2019 10:48 am
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Hi Brian.  Thank you for your reply. I would have hoped so, Screwfix have all the brands that you mention, the boxed set that I purchased was in the same price range , but, now you come to mention it , they don’t seem to have a brand? Back in the good old “Imperial “ days I always purchased Dormer drill bits.   Best wishes Kevin 



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 Posted: Mon Feb 18th, 2019 10:56 am
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Hi Nigel. Thank you. “ Not a lot of Welly “ is the term that I used for Light Pressure, think of “ pedal to the metal “ and I do the opposite. But I didn’t expect a modern HSS drill bit to fold in aluminium. I best see about returning the bits to Screwfix.  Best wishes Kevin 



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 Posted: Mon Feb 18th, 2019 11:04 am
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Kevin

You can still buy dormer drill bits but you we need to go to a business that supplies the engineering trade like FWB which are nationwide. You need to remember Screwfix is targeted at the building trade so therefore they stock mainly things that are relevant to that.

Brian



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 Posted: Mon Feb 18th, 2019 04:23 pm
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Hi Brian.   Thank you again.  Apart from “ Friends With Benefits “ who or what is FWB?Best wishes Kevin 



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 Posted: Mon Feb 18th, 2019 04:29 pm
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Passed Driver wrote: Hi Brian.   Thank you again.  Apart from “ Friends With Benefits “ who or what is FWB?Best wishes Kevin 
Here ya go Kevin FWB Very large nationwide company and they sell dormer drill bits

https://www.fwb.co.uk/

Brian



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 Posted: Mon Feb 18th, 2019 04:33 pm
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Thank you Brian.  Best wishes Kevin 



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 Posted: Mon Feb 18th, 2019 09:14 pm
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Hi Kevin,

They will if they get too hot. Was this pure aluminum or an alloy? Some are quite hard.

Nigel



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 Posted: Tue Feb 19th, 2019 03:45 am
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Hi Nigel. Thank you. Re aluminium, I am uncertain of the hardness. You may have a valid point,but, it doesn’t/didn’t rust whilst it had been outside in the garden.   Best wishes Kevin 



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 Posted: Tue Feb 19th, 2019 04:37 am
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Isnt the best lubricant for drilling aluminimum, Methylated spirits and make a "well" of bluetack or plasticine , then fill it .....

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 Posted: Tue Feb 19th, 2019 04:53 am
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I keep a small dropper bottle of drill lubricant next to the drill press and always use it for steel and aluminium.

No, methylated spirits, or any highly or even slightly inflammable liquid has a place near a hot work piece. Yikes, call the fire brigade!

Bill




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 Posted: Tue Feb 19th, 2019 05:00 am
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Hi Diablo.  Thank you for your reply. It didn’t occur to me, when drilling aluminium, it is like a “ piece of cake “ ,but, then again, I had only just started drilling. Fifty odd years ago, when I worked at a small engineering company it was likely that there was a brush for the purpose with “ suds “ in a tin. Best wishes Kevin 



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 Posted: Tue Feb 19th, 2019 08:27 am
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Hi Kevin,

Aluminum rusts (technically oxidation) faster than greased lightening. That's why it is a pita to solder. The oxide film is very impermeable and tightly bound, takes decades to start pitting. Check what angle you have on those bits. How big a hole and what thickness of metal? Although even a wood drill bit should go through regular aluminum. I think you may have a hard alloy.

Diablo: The heat generated will cause a fire with meths. the flashpoint is less than 20 degrees C. A bit cutting metal will quickly reach 200-500 degrees C. Cutting oil is meant to tolerate high temperatures and reduce friction. 


Nigel



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 Posted: Tue Feb 19th, 2019 09:20 am
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Hi Nigel. Thank you. That is why I mentioned the “Suds” from all those years ago, when I began my first job at 15 years old, in a small engineering factory, that used to shake once the overhead belt and pulley system was working.But I digress. The hole was to take a 4BA screw, used to fit the hinges on the plywood, in lieu of washers, that the supplier didn’t have in stock. The aluminium is about 1/8” . Best wishes Kevin 



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