Comments on: Hot or Not? Black & Decker’s Rotary Tools

By: machine is smarter than men

machine is smarter than men — Sun, 28 Sep 2008 17:03:03 +0000

To the fellow in Korea,

Are you using the appropriate RTX for the Korea AC standard ?

By: K McGregor

K McGregor — Tue, 08 Jan 2008 05:14:35 +0000

I’ve owned 2 in South Korea and they both caught fire. Is it something in the Asian air? The second unit I owned was shown in a classroom. I was teaching about hobbies to Korean English students, and 30 minutes of on/off use a student says this is getting hot. He dropped it on the floor, flames came out the sides. The class was wondering is this common of all Black and Decker tools?
That is possible, considering that with was similiar to what happened to the first Black and Decker I owned.
Maybe I should buy another tool in Seoul and make a video for Youtube? The rotary tool that if your not careful will give you a very bad hand job. Where is the quality?

By: Nate Bezanson

Nate Bezanson — Wed, 03 Oct 2007 09:25:02 +0000

A linear pot is a terrible thing to do to a motor. Remember how you’re supposed to unplug your motor-driven appliances when there’s a power failure, so they don’t destroy themselves if power comes back up into a brownout state? With too little voltage, the windings don’t produce much torque, but they draw more amperage, which produces a lot of heat. Since the rotor’s not moving (quickly), there’s less ventilation, and the motor burns out.

Pulse-width modulation is the best way to effect speed control of an electric motor. During the on-time, full voltage is applied to the windings, so you get plenty of torque for not a lot of amps, and correspondingly little resistive heating. During the off-time, there’s no torque but also no heat.

On the plus side, I believe most modern dimmers are PWM, though I have no direct experience there so I’ll defer to someone more experienced.

By: Stuart Deutsch

Stuart Deutsch — Tue, 02 Oct 2007 14:27:00 +0000

Correct me if I’m wrong, but I do think that a light dimmer can be used with a motor such as this one. A typical chandelier may have let’s say 6 75 watt bulbs, which means that a dimmer must be able to handle 450 Watts of power.

If the motor in the tool is 2A, then the dimmer only needs to handle 240 Watts total. Seeing as how dimmers are typically linear potentiometers, it should work alright. If the motor requires a particular starting voltage, then one only needs to start it up under max voltage and crank it down afterwards. If the motor does get damaged, $15 isn’t too hefty a sacrifice to the whoopsie gods.

By: Kurt

Kurt — Tue, 02 Oct 2007 13:31:22 +0000

Can you really use a light dimmer and not hurt the motor?

By: BoomGuy

BoomGuy — Mon, 01 Oct 2007 07:21:02 +0000

I bought one a few months ago. Not the multispeed version, but
a single speed version for $15, along with a light dimmer which
I use to adjust the speed. ( Plan is to find an old sewing machine pedal to convert into a foot speed control . If you do this you cannot have a multiple speed tool. )

So far it’s worked fairly well, though I don’t push usage time. But considering the amperage is 2A I find it hard to criticize it at the price.

By: Sam

Sam — Sat, 11 Aug 2007 03:27:43 +0000

I own both the B & D RTX three-speed rotary tool and a variable-speed Dremel, which no longer works. I was never happy with the Dremel, because the brushes tended to wear out quickly and the variable speed “feature” was not an asset — the speed varied even when I didn’t want it to and the tool would cut out at certain positons on the speed control. The slightest load would cause the rotational speed to drop noticeably.

The RTX in my opinion is a vast improvement over the Dremel tool. Even though it only operates at three discrete speeds, the speeds are well chosen to match most common tasks, and the tool holds the set speeds extremely well, even under varying loads. I’ve had the RTX for over two years and it had never given me any problems. Every Dremel accessory that I have tried has worked with the RTX, including a 24″ flexible shaft attachment.

Several of previous comments either don’t address the product that is being discussed or provide opinions formed without ever owning or even using the B & D RTX. (It is not a battery powered device and it’s not a “Wizard.”) Not very helpful information, guys.

By: Convictus

Convictus — Tue, 10 Jul 2007 21:32:17 +0000

Not!

I own one, and am constantly frustrated by the shape of it. This does not fit many of the external optional Dremel accessories. I have the Dremel drill press, and tabletop router and neither fit this worthless tool. Mine is 3 speed, only 1 is actually really usable. About half way between low and med, is the only speed fast enough to cut, but easy to control. I have made things with it, but prolonged use (2+ hours and I started to melt the bushings and had to shut it down and wait for it to cool down)

Personally I would find one on close out and use it for destructive purposes, ie jobs you wouldn’t want to murder a good Dremel on.

I second the metal collar comment though, it is sturdy, not tough.

By: Bowen

Bowen — Mon, 09 Jul 2007 14:58:04 +0000

I had one of their Wizards and even though I only paid $12 for it (clearance at Wally), I felt ripped off. Between the case splitting under the bezel within a week of very light use, the very spongy/unreliable speed selector and the lack of real oomph (even for a battery device) it ended up getting stripped for parts and replaced with a real rotary tool.

The battery was nice though and now powers a home-brewed LED worklight.

By: kythri

kythri — Sun, 08 Jul 2007 19:34:25 +0000

Lukewarm?

I’ve got a real Dremel, and I absolutely love it. I finally decided to buy one at Costco when they had a big kit with all kinds of bits and accessories on sale.

Wow, it’s an improvement over my old Weller Mini-Shop piece of garbage.

As far as Black and Decker goes, however, I will say that I do find the AA-powered devices (the pumpkin carver, golf ball polisher, etc.) that this turned me on to (http://toolmonger.com/2007/01/09/reader-find-dremels-alkaline-powered-minimite/) are quite handy.

I don’t think I’ll be replacing my real Dremel anytime soon, but the cordless devices help out in a lot of places.

By: Will

Will — Sun, 08 Jul 2007 14:36:37 +0000

I have had one for about a year now. I use it for case modding, a little wood carving and of course sharpening things like the lawnmower blade and shovels. I haven’t had a single problem with it yet (even though I do have a gripe with B&D over their crappy sanders).

Hot

By: Rick

Rick — Sat, 07 Jul 2007 00:58:43 +0000

Hot.

I have had one for a couple years works as good as my fathers Dremel.
Of course it was free.

By: Diddly

Diddly — Fri, 06 Jul 2007 20:50:44 +0000

NOT - I had one that died within 6-9 months of infrequent use.

By: Mel

Mel — Fri, 06 Jul 2007 15:41:47 +0000

eschoendorff Says:
July 5th, 2007 at 8:38 pm

NOT. For $40, just buy a real Dremel. They’ve been doing it longer…

SECONDED - I have an old 1-speed Dremel that’s probably close to 30 years old and still going strong

By: eschoendorff

eschoendorff — Fri, 06 Jul 2007 02:38:20 +0000

NOT. For $40, just buy a real Dremel. They’ve been doing it longer…

By: Buck

Buck — Thu, 05 Jul 2007 19:06:45 +0000

I don’t really have an opinion on the tool itself. I do like, however, that the accessory rack for the B&D tools usually has fiberglass reinforced cutoff wheels that work just fine in the Dremel mandrel.

For some reason, the Dremel brand rack at my local home improvement stores all only have the non-reinforced cutoff wheels, which are really only good for exploding into sharp, fast moving, flesh seeking shrapnel.

By: Bryan

Bryan — Thu, 05 Jul 2007 19:05:11 +0000

NOT — I bought one of these on sale at Home Depot, got it home and started working with it. You have no control with the B&D RTX. I went out and bought a Dremel the same day. I still have this thing, but I couldn’t tell you why — it’s worthless.

By: Paul

Paul — Thu, 05 Jul 2007 18:59:44 +0000

I’d say NOT, I read stories about case modders who just gave up on these and went with a real Dremel.

By: GlennZilla

GlennZilla — Thu, 05 Jul 2007 18:57:37 +0000

I have had one for several years now. It was a gift from my girlfriend (now wife).

I used it to lop off parts from pewter wargaming miniatures and to handle computer case mods. So mostly I just use the cut off wheels and of that it’s great. I have only used it for grinding and wood carving on occasion, but found it to similar to my old dremel.

There are a couple of misconcpetions about it though. At least my older version has metal threads beneath the plastic “Accessory mounting collar” so I doubt John’s problem would persist. I believe that they do sell a mini router for it.

I don’t put it though torture so it’s stood up well for me so I haven’t personally had Stuey’s complaint.

And finally the biggie. the speed is variable. See the wheel in the back near the power cord? That’s the speed wheel. It’s simply numbered 1-10 but I think the manual (I’ve misplaced) gave the rough RPM equivalent for each number.

Feel free to email me with questions. Glennzilla (at) glennzilla (dot) com

By: Pete Hartman

Pete Hartman — Thu, 05 Jul 2007 18:53:54 +0000

NOT.

I had a battery powered Wizard a long while back, it was useless, I gave up and spent the $$ on a real Dremel.

By: John Laur

John Laur — Thu, 05 Jul 2007 17:28:17 +0000

I’d be happy if someone finally ships one of these things with secure and accurate attachment options to allow it to be used as a miniature precision router. The plastic threads around the collars of the dremel are complete junk and even though this tool has what looks to be a metal nut, it appears the threads are again plastic underneath.

The dremel and related tools have their place but when you have to basically freehand everything they loose a great deal of their utility.

By: Stuey

Stuey — Thu, 05 Jul 2007 16:06:36 +0000

I’m going to say NOT, but without ever trying this tool. My experiences with Black and Decker are not as fond as those that my father had with their older stuff, so forgive me for being biased.

In a pinch, I bet that these aren’t substantially better than the $15-20 units you can find at amazon or harbor freight. Since I use my rotary tool often, I stick with Dremel for the speed control and because I trust Bosch a bit more than I’d trust a B&D copycat.