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Why drill bits bought from Amazon cannot even drill IKEA wood? 4

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BreadboardPerson

BreadboardPerson

Mechanical
Apr 12, 2016
32
Hi, I bought a set of drill bits from Amazon:

Hymnorq 1.0 to 10mm Metric Jobber Twist Drill Bits Set of 19pcs Titanium Coated HSS 4241, Straight Shank for General Purpose in Wood Plastic and Soft Metal Sheet

To my disappointment, they could not even drill IKEA wood! How come?

Are there any specifications that I should pay attention to?
 
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@SnTMan The ones I got cannot even make a hole. Paired with the IKEA drill, I could just make a small dent. Those drill bits I used at schools could drill woods and aluminum. These cannot even make a hole. Unbelievable!
 
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Resharpen the drill size diameter you need
And resharpen it. Look up the relief required in the machinist hand book
Or look up the relief for wood.
If steel is 5 degrees relief, grind a 10 degree relief.
Use a simple protractor to measure it.

The old saying you get what you pay for.
The price is tempting but the fact is the
Drills are junk.
Go to home depot. And buy a good set.
Of name brand drills.

An other tip is mark an X on the hole location and use a center punch.
With a light tap of a hammer punch
A center. Then use a drill.
It will help center the hole and start it.
A center drill will work to.
Keep the starting RPM slow of the drill.
Resharpen as necessary.
I was trained at early are to sharpen drills.
 
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Price was not the key factor when selecting it. There seemed to be many positive reviews so I bought it. Too bad the return window has already passed.

How is McMaster's set compared with those from Irwin and Dewalt?
 
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Mcmaster tools are great. And will get the job done.

I left out a couple of important tips.
When re grinding drills, try to keep the
Crown on center best possible.
An imperfect ground drill will cut a hole slightly larger.
Use a smaller drill to start the holes.
The use the finishing drill for final size.

What is nice about Mcmaster care is they have almost every thing far as tools.
But the convenience are more expensive.
But I have had good service in the past.
 
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Real drill bits are made from quality tool steel such as m2 or m4, and the mfg heat treats them with care. The grinding and sharpening are done precise.
And makes a big difference when trying to drill precise holes. When the job is important. It pays to buy the best.

In the future buy a small drill sharpener
It will pay for it self.
 
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What materials which made of the drill bits should I choose?

I am used to using drill bits set and screws with M1, M2, M3, M4, M5, ..., written. In North America, most drill bit sets seem use inches which I am not familiar (the main reason bought that product from Amazon) . I am not sure if those from McMaster have M1, M2, M3, ... written on it. Their pictures are too small.
 
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Quality drills = quality tool steel..
And are made for tradesmen.
Don't worry to much about it.
But should say on the item..
There are metric size drills available.
I have used them too.
Most my previous post are FYI 😁
 
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BreadboardPerson and everybody else, something is way wrong here. You should be able to make a hole in IKEA (pressed ?) wood with just about any piece of metal, even your Amazon drill set. You can chuck a nail in a drill and make a hole in wood. Why don't you give some detail.

What size hole? How deep? What drill? How fast you running it? What is an IKEA drill? What is IKEA wood? BTW, 1 inch = 25.4 mm.

I don't doubt your drill set may not be the highest quality available, but c'mon, really.


The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
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Sntman
I suspect cheap junk with the wrong drill geometry not sharpen correctly.
Put this way when a drill gets dull.
And the cutting edges are damaged.
It will not drill squat.
I believe poor quality control and
Badly sharpen drills.
If one use a 5x magnification to visually
Look at the drills they probably look
Like poop.
 
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I think we can all agree
If a cutting tool is used with improperly
With the wrong feeds and speed it will
Damage it. Depending on the hardness and toughness of the material being machined.
Laminated wood can be abrasive .and will dull low quality drill bit. If improperly used. Feeds and speeds are important.
And are only as a starting guide.
There is fine line between efficiency and wear. Machine to fast it will wear the tools faster. Go to slow losing time and money.
Once a tool looses it's cutting effectiveness it ceases to cut and will
Rub and only damages it more.
Some you experienced machinest not telling nothing new. This is not for you.
This is for young or inexperience people.
A high speed tool will not hold up as carbide drills, and indexable drills if properly used will be more efficient.
For a single project a tool steel will work fine if used correctly and is of good quality.
 
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is this the drill? Have you tried a different drill? 7.2V is wimpier than my 19.2V drill, with 2 cells shorted; mine could not drill through standard 2x4; but same bit with a fresh battery in the drill worked perfectly

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert! faq731-376 forum1529 Entire Forum list
 
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Good point IRstuff
Yes a crappy portable drill would not help.
And the size of the hole would make difference. My harbor freight portable drill is for light duty work. But it still drills.
For heavy duty drilling I have a makita.
Here again quality vs cost.
 
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Well there's this review:

Annotation_2020-07-19_162707_oq34bi.jpg


Could explain it all :)

The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
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Well there we go
Some probably got lucky and had decent
Sharpening.
 
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"Some probably got lucky and had decent Sharpening."

I often sort reviews by date.

Sometimes what was junk is now OK. Or not.
 
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fact is from experience I was correct, where I failed is to supply actual data, engineers need actual data to confirm.
yet it is unacknowledged I was correct, no matter nothing to see here move along. next issue.
 
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