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

[BreadboardPerson]

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?

 

[hydtools]

Sounds like the points were not properly sharpened. Return them.

Ted

 

[dgallup]

Did you even read the reviews? These are complete junk. Even the manufacture alludes to it.

"They are made of high-speed steel 4241. There are several commonly-used HSS types: 4241, 4341, M2, M35, M42. HSS 4241 is of the lowest price and relatively lower quality compared to others. "

"The finish of this bit set is decorative titanium coating, mainly for anti-rust and decoration."

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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.

 

[BreadboardPerson]

Yes, I read the reviews. Most users gave it high rating so I bought it. Any recommended products? Ideally in metric system.

 

[handleman]

30155A55
Or if you really want them to last:
27945A25

 

[BreadboardPerson]

Thanks. What are these numbers? Searching on Amazon does not result in drill bits

 

[cowski]

What are these numbers?

They look like mcmaster carr numbers to me.

 

[hydtools]

Maybe buy Irwin or Dewalt

Ted

 

[IRstuff]

I've bought cheap stuff from eBay and HF; they seem to work tolerably well. The big advantage is that you can overdrive them and not feel too badly if, or when, they break. For drills, it helps to have sufficient torque. My electric impact driver has way more torque than my electric drill, so for the same bit, the former will get through stuff while the latter takes a while to even make a dent. Of course, this was also how I found out that two of my four batteries for my drill had shorted cells.

You seem to post a lot of DIY questions; this site is intended for work-related problems.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529 Entire Forum list

http://www.eng-tips.com/forumlist.cfm

 

[handleman]

If you don't recognize McMaster part numbers, you're probably not an engineer.

 

[hendersdc]

handleman - true, got a good laugh out of that!

 

[3DDave]

Twist drills aren't so good for drilling wood, particularly engineered wood. The shear strength is higher than the tensile in some axes, so there's a lot of tear-out. Twist drills get useful in harder woods, like oak and yellow pine.

Without knowing what size hole I cannot recommend, but I personally have brad-spur drills, spade-bit drills, and some specialized bits for creating screw holes. The first two have cutting edges to slice the wood so that the shear loads only get applied to material being removed.

 

[SnTMan]

...they could not even drill IKEA wood!

What do you even mean by that? I'm pretty sure they'd make a hole. Not running in reverse are you?

Share a pic maybe?

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[TheTick]

Are you complaining about getting what you paid for?

 

[MacGyverS2000]

https://www.drilldoctor.com/

Fixes everything... though there's not much you can do for longevity if the alloy is crap.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[btrueblood]

What Mac said.

 

[TheTick]

When I was working as a machinist, the best drill bits came from Spain.

 

[mfgenggear]

softer material that has to be drilled requires different drill geometry, EG plastic, wood,
a drill made for steel does not work well on wood or plastic.
for example wood a spade drill with sharper edge with less relief wood have better performance.
or drill specifically designed for wood. a simple google of such would give a guide of what type of drills.

people who are not trained in working on the floor can not be expected to know. even some engineers, example electrical engineer
just out college. it take time to hang around the floor and learn.

 

[handleman]

Look at the sizes stated... 1mm to 10mm metric. At these small sizes, there's not an appreciable difference between performance of a regular twist drill and a specialty wood bit for a DIY. Heck, most spade/forstner bit sets start at 3/8", which is 9.5mm. If you were going to drill thousands of holes, maybe invest in a brad point set...

 

[mfgenggear]

yes we agree disagree, all points of view, while standard drill will drill, made with quality.
it's important to know the difference ,tool bit manufacture for turning and drilling will give better performance no doubt.
I learned from a swiss machine builder who ran a swiss screw machine shop. I worked for him as an employee, very smart machinist and business man.
and yes for one or two parts it would work, but I disagree there is not a performance difference.
in a screw machine shop starting quantities is 500 parts and into the thousands. it's important when costing pennies and seconds.

a manufacturer who advertises for both wood and metal is fooling the public at large who has no clue and is knave.
for machining wood and plastic which is much softer than steel, like I said it is important to have a sharp edge.
more for plastic less for wood.