drilling holes

[norbie454]

This does sound like inferior bits as a few others have brought to your attention. However when you drill a pilot hole, try and not go much larger then the web or the thickness of the tip point. If you have a high grade bit that is sharp it may tend to catch and spin in your chuck causing the shank to self destruct. You might want to go to your local hardware store and pick up a good quality cutting fluid in a 4 oz can. Remember the little extra cash you spend on cutting tools will make the experience more pleasant. Saving money here is not worth it, you do get what you pay for. Hope this helps out.

 

[radioman]

I used the HF 3/4 silver and deming drill bits with my cheap TSC drill press and transmission fluid. As long it was in a oil bath, It cuts just fine.It does take a bit but not 10 mins. I did noticed after the 5 hole, I had to touch up the bit in a grinder to make it cut again. I can't really see the bit being dull before using, but can tell when its in use.

I always back off every now and then to let oil seep in hole or add more to keep it cool. any whiff of smoke just makes it dull in a hurry with those cheap HF bits.

 

[Travelover]

I seem to remember a similar thread about this time last year.

Come on spring! :laughing:

 

[Scotty Dive]

Thanks all....Maybe I burned these up and they need sharpening....I have never sharpened a bit....how is that done?

 

[sal64]

Thanks all....Maybe I burned these up and they need sharpening....I have never sharpened a bit....how is that done?

it should take 20 sec to drill that hole one shot no pilot on a good drill press your drills are prob very dull, sharpening drills takes a nack not so easy to do.

 

[Travelover]

Thanks all....Maybe I burned these up and they need sharpening....I have never sharpened a bit....how is that done?

I'd recommend a drill doctor.

Amazon.com: Drill Doctor DD750X Drill Bit Sharpener: Home Improvement

 

[Transit]

Thanks all....Maybe I burned these up and they need sharpening....I have never sharpened a bit....how is that done?

That is why I have a set of Cobalt bits. Check around for how to sights on bit sharpening. The point shape makes all the difference.

 

[Brad_Blazer]

Thanks all....Maybe I burned these up and they need sharpening....I have never sharpened a bit....how is that done?

Like this. Start with the cutting edge parallel to the wheel face and rotate the bit up about an axis parallel with the cutting edge.

 

[retiredmgn]

I think I was about 12 years old when my Gramp showed me how to sharpen a drill bit - freehand. The only trick involved was the twist at the end to ensure the trailing edge was lower than the cutting edge.
First job out of high school was in a factory producing printed circut boards. Lots of drilling involved. There was a jig for sharpening bits and guys would spend an inordinate amount of time getting set up to produce a 'perfect' bevel.
It just ain't that much of a mystery. Once you know how, 20 seconds at the wheel and you're back in business.

Drop by the house when you have a chance. I'm most always here. Free lessons.

 

[wdchyd]

The oil trick works but what you what to remember the object is keeping your bit cool.....not lubed.......

I routinely drill out high grade steel with HHS bits as large as 2.5".......the trick is to keep it cool with anything and slow down your rpms.......I have flood coolant set up on lathes, drill presses and milling machine......the coolant is 95% water and 5% water soluble oil (only to protect the machines from rust).....

When drilling something away from my machines I use plain ole water in an old dish-washing detergent bottle (garden hose works too)......the water will make a mess but it'll dry up with no oil spillage.......have someone hold the squirt bottle and feed it continuously while you put the boots to it......it works.....:thumbsup: