24th August 2025 24th August 2025 By Bzzz In tools diamonddrill bitdrill bit sharpenergrindingoff-centerwobbly

Multipurpose Drill Bit Grinding Sharpener Wear-Resistant Diamond Grinding for Impact Electric Drill Sharpener Drill Bits (WHL #111)

As evident by me not posting last week or the week before (shame!), my current priorities aren’t so much on the electronics DIY side. However, I do have a cool drill bit sharpener presentation coming up, and I just realized that I can contrast this with some utter crap that I already bought a year ago. Meet: The drill-powered drill bit sharpener

Okay, first things first: Bought in August of 2024 for 7.28€, received it, had a good laugh at that turd, made a short video (down below) to ask for a refund, and got to keep it afterwards. So including the 1€ “late delivery” coupon that was ubiquitous at the time, I came out okay financially and also no drill bit was hurt in the process.

Now, here’s the advertisement image:

Sure, Jim.

Before fancy sharpening tools were a thing, skilled people used a bench grinder to sharpen their drill bits. Several important notes here:
1. Skilled people
2. Table-mounted bench grinders that just operate at the same RPMs indefinitely
3. Only works with straight grinding discs, wobbly bits and grooves are no good here

And that works fine, no issues here. But dumbing it down to a tool that is attached to a drill (so one hand utilized to operate the drill) and advertised to literally anyone without prior knowledge of how to grind drill bits, that is very clearly a recipe for a Wan Hung Lo product.

Here’s the shipped unit: (ignore the screws that poke out, the original screws were made of taffy and compressed cow manure, and couldn’t be removed without fully wearing them out)

These are the drill guides suitable™ for a wide variety of sizes:

And this is everything inside:

Before ordering I wondered how they would construct the thing, with bearings and internal guides to keep certain angles…but all it got was slightly too large bushings to guide™ both axis once the thing is screwed together. Yeah, that worked out nicely.

Metal on metal, rubbing away any imperfections. Speaking of imperfections: The other side of the mounting rods directly attaches to the plastic, which obviously came straight from a worn, shabby mould. One or two degrees of misalignment right there!

Same on the other side, this is not factory but instead deburred and slightly honed to rotate around a common axis predefined by the other plastic parts and the metal contact faces. Those aren’t straight, but at least the imperfections of the two cog wheels aren’t added on top of that…

And here’s the funny video of the thing in action – this caused Aliexpress to grant a 100% refund within minutes. It’s so blatantly obvious to not work as intended, even the AE reviewers got that right away. As we say in German “Das sieht ein Blinder mit dem Krückstock” – “Even a blind man on crutches can see THAT”.

Can you imagine properly sharpening a drill bit, or even fine-trimming the webbing on a larger piece with that wobbly piece of shit?

On the bright side, as I said I didn’t pay for that, plus I got to keep the two diamond grinding wheels which could be helpful in the future. I wouldn’t put them into the Dremel at tens of thousands of RPMs, but at low speed and mounted in their actual center, these aren’t that bad after all.