(Part 2) Best power grinders according to redditors

It looks like this is just people rocking the thing back and forth until the concrete breaks. Might be using a hammer and chisel to break the concrete more.

Blowtorch? Too inefficient. I would use a battery powered angle grinder, which TBH somebody who is doing these thefts on a regular basis would certainly have (maybe stolen as well?).

In a pinch, a power drill might work as well, it would take longer though.

For that kind of cutting, you should use an angle grinder.

L brackets are usually made from galvanized (zinc-dipped) mild steel. Note that burning, cutting, or welding galvanized metals without a respirator and adequate ventilation is a bad idea.

First, scuff-sand the brackets. Spray with primer, wait for it to dry, spray with paint, wait for it to dry, spray with clear-coat.

I can tell that you're putting the spray paint on a bit too heavily. See how the primer is visible at the edges? That's because the paint is too liquid, and is pooling. Back off to 8-10". Spray paint should settle into place as particles, not be blasted on in a heavy liquid. Multiple light coats are better than 1-2 heavy coats.

Also, wrap the screw & bolt threads with blue painter's tape before priming & painting.

20v dewalt angle grinder with 4.5in cut off wheels. About 20 seconds of “work”

Edit: I have this one uses same batteries as my drill

Something like this

uxcell 16mm 5/8-inch Drill Angle Grinder Mandrel Adapter Disc Holder 2 Wrench Set 3 in 1 https://www.amazon.com/dp/B071J1J16X/ref=cm_sw_r_cp_apa_i_dBR7CbW1K7ZFB

That's not what makes it staged. The grinder is real. Example: https://smile.amazon.com/Makita-XAG13Z1-Lithium-Ion-Brushless-Cordless/dp/B01JILBMNU/ref=sr_1_14?s=power-hand-tools&ie=UTF8&qid=1520992509&sr=1-14&keywords=battery+powered+grinder

Perhaps, I feel, i have up-sold the power I would need. I guess I wasn't thinking that you guys would be in the mind set of industry type jobs.

So let's see if this alters your opinion any. When I say air brush, I don't mean a massive re-spray a car one I mean a model maker type small hand one.

And the pencil gringer is pretty similar to This

It's for sure on the table, jeweler type work. I just didn't want something too small that I'd have to baby all the time.

With this new information am I still looking at a $1,200 compressor with a 60/80 gallon tank? This seems excessive to me but as stated in the OP I know nothing, so I'm happy to take your word, just checking.

Metabo Angle Grinder is what you are looking for. It consistently is what welders end up getting for their work. They rely on angle grinders hour after hour every day of their working life. It's going to fail eventually but apparently this one lasts longer than others and if you aren't using it every day of your life then it has a better chance than others to last you the rest of your life.

I'm in no way defending the Hercules tools, but compare apples to apples. Quick look shows current model 11A 4.5" grinders from Dewalt and Makita as:

$139 https://www.amazon.com/DEWALT-Grinder-2-Inch-Paddle-DWE4222N/dp/B018DZ6V2Y/ref=mp_s_a_1_6?keywords=Dwe4222&qid=1570455906&sr=8-6

$147.63 (12A) https://www.amazon.com/Makita-GA4542C-SJSII-Power-Grinder/dp/B00Z5LTO7O/ref=mp_s_a_1_1?keywords=Ga4542c&qid=1570455737&sr=8-1

The Dewalt (and I'd assume the Makita as well, at this price) includes a brake which the Hercules does not have.

Sure. Here’s a basic one: https://www.amazon.com/Neiko-10649A-Air-powered-Grinder-Capacity/dp/B000K801NI

If you wanted to go flex shaft you could go with something like this: https://www.amazon.com/Electric-Flexible-Grinder-Rotary-Variable/dp/B06XJSK1K4

For the bowl, the bit was a single-cut burr. Like this: https://www.amazon.com/dp/B00ECMQUGK/ref=cm_sw_r_em_apa_i_3DFRDbPJCREKT

For the handle, a coarse bit, like this: https://www.amazon.com/dp/B0037MFFQ2/ref=cm_sw_r_em_apa_i_zHFRDbEF4ADCX

Both used on an old in-line, Dremel-style rotary tool. It's a bit more robust than a Dremel, but same idea.

Edit: Ah this is pretty much the tool:

https://www.amazon.com/dp/B01C3WPX6I/ref=cm_sw_r_em_apa_i_ELFRDbCV6QAX4

Wire brush works, but is kinda sketchy; the bristles fly off a lot. A cup grinding wheel is much way better & safer. A dust shroud is money well-spent, too.

AFAIK, this is what a Metabo made in Germany looks like, the base models are all one color plastic and are made by slaves in some Asian hell hole.

Is it one of these two 13 amp models (paddle vs no paddle switch):

• https://www.amazon.com/Bosch-GWS13-50VS-High-Performance-Angle-Grinder/dp/B01CEA1CGY/
  
• https://www.amazon.com/Bosch-GWS13-50VSP-High-Performance-Grinder-Variable/dp/B01CEA1DJA/

Cordless angle grinders cost less than the best bike chains. It’s not even fair.

OEMTOOLS 24492 20V MAX Li-Ion Cordless Angle Grinder https://www.amazon.com/dp/B071JC3TM5/ref=cm_sw_r_cp_api_qJGSBbM9DZH9Y

They don’t even need a big bag of tricks. This will cut through pretty much anything and that big handle is detachable and not really needed for cutting so it’s portable.

I used to build cool custom ebikes but these days it’s easier/cheaper just to steal them. /s

The Wolverine jig and Vari-Grind accessory are one option, and probably by far the most popular, but there are also:

• Cheap^[1] knockoffs^[2]
  
• Less complex "one-grind-fits-all" jigs like the Ellsworth Jig
  
• Wet grinder systems like the Tormek (and^[1] many^[2], many^[3] knockoffs^[4] with compatible jigs
  
• A few styles of sander-based systems, like the Robert Sorby Pro-Edge
  
• Some professionally produced homebrew jigs/systems that have a small market amongst fellow turners (usually found on forums)
  
• And finally there are countless DIY options of varying quality and functionality (there's a couple links in the wiki).
  
  
  
  

That looks like it could be threaded into the larger component, kind of like a big bolt.

See those two little holes in the second image? You should find a tool like this that fits in those two little holes and try to turn it counter-clockwise. You may want to put some sort of penetrating fluid in there first to make it easier to remove.

Surface grinder with diamond cup wheel hooked up to a vacuum.
I use the Dewalt DWE46153 hooked up to a shop vac with a bag and hepa filter. Usually you can rent them from HD or other tool rental places

You're right.

Your average successful thief is carrying something like this:

http://www.amazon.com/Bare-Tool-Porter-Cable-PC18AG-Cordless-Expansion/dp/B003IXRB1W/ref=sr_1_6?s=power-hand-tools&ie=UTF8&qid=1341285438&sr=1-6

That cutoff wheel will slice through any u-lock, chain, or cable in seconds. And if they really like the bike, it'll slice the frame tubing even faster.

Hmm... I have a gyphon gryphette grinder from Amazon here: https://www.amazon.com/Gryphon-Corporation-GRYPHETTE-Gryphette-Grinder/dp/B003GF707M

... I think I'm already pretty aggressive putting probably too much force on it when I'm grinding and I get impatient. (This is not when I crack things... it's always when using grozer pliers to get off some excess glass). I do a combination of pushing forward and left to right, mostly just trying to figure out what's faster. Maybe I just need a new bit? But I've barely used the bit as it is... How often do you need to replace them?

Here is my shortened list, I put an asterisk next to items I can't do without

Items you buy once:

• breaking pliers*
  
• running pliers*
  
• glass cutter (i prefer a pistol grip one)*
  
• Solder Iron (get one that has temperature control!) + solder iron stand*
  
• safety glasses*
  
• fid*
  
• grinder (can be cheap! I have this one and I am very happy)*
  
  ​
  
  Supplies you replenish:
  
  
• Flux*
  
• solder*
  
• glass cutting fluid*
  
• foil*
  
• silver sharpie (those things write so good)
  
• glass cleaner (or isopropyl alcohol works too in a pinch)
  
• patina + rubber gloves

Buy one of these:

https://www.amazon.com/gp/aw/d/B001VGOJLI/ref=mp_s_a_1_3?ie=UTF8&qid=1501822466&sr=8-3&pi=AC_SX236_SY340_QL65&keywords=battery+angle+grinder&dpPl=1&dpID=41Xlk%2BdKSNL&ref=plSrch

Hopefully you registered your bike (https://www.denvergov.org/content/denvergov/en/police-department/safety-prevention/theft-fraud-prevention.html) so if the police show up you might have some plausible denialibility...

>...it is easily broken by a tool that costs 10x the lock price.

Or much, much less. I still haven't seen a lock that will stand up to an angle grinder which can be had for $100 (only $20 for a cheap, corded one): https://www.amazon.com/Milwaukee-2680-20-Lithium-Cordless-Resistant/dp/B001VGOJLI

​

My 15 lb. Kryptonite chain I carry was $100 and I also always use an ABUS Bordo alarm lock which put me out another $150.

http://www.amazon.com/Hitachi-G12SR3-2-Inch-Angle-Grinder/dp/B000ULQVCU

Have you considered air powered tools? There's of course the downside of needing a compressor, but the tools themselves tend to be way cheaper, durable, and easier to maintain than electric counterparts. (Also they don't bind in as dangerous a manner if you stall the motor.)

There is only one cordless grinder on the market that is worth owning. I'm not just being dramatic. To be useful, a grinder needs to pull a lot of power and one tool puts the rest to shame, that tool is the DeWalt 60 volt grinder. DeWalt also has a 1/2" brushless impact wrench which accepts the FlexVolt battery from the grinder. (Note that the grinder requires the 60v battery, which switches to 20v when used in a 20v tool).