General > General Technical Chat
Rotary tools in support of electronics, Dremel and more ..
StubbornGreek:
I use a Dremel with a flex shaft attached but I've been eye-balling a proxxon for a while - I just can't justify the purchase as I use other tools for precision work (like a drill press, etc.) and my little Dremel (ok, I have a few) does everything I need it to.
robrenz:
EDIT: posted my negative thoughts on this thing above.
:DI just found this milwaukee unit. If it the same quality as all the other milwaukee stuff I have it will be a winner. The reviews are very positive. I know it is battery powered. If you dont like that hook up to your PS at 12V. Milwaukee manual/parts list shows no guts so cant see internals.
I dont like the typical "plastic shell at resonant frequency" sound in the video but that is a big disk and probably running at its top 32000 rpm. I do like the electronic overload protection that kicked in in the video, very nice. I know my M12 drill and my M12 driver also do a forced shut off at the low battery level, also very nice.
The kit is better buy than the bare tool without battery. For $20.00 more you get a $45.00 battery and a charger
Milwaukee press release
http://www.milwaukeetool.com/news/press-releases/1146
You tube review.
saturation:
I concur, I give their design the benefit of the doubt, but Amazon users review suggest the design can have issues particularly if the motor is overloaded or even run for extended periods, the geared connection is a source of heat generation, and transfer loss probably caps the upper speed to 20krpm.
The Dremel design is a more reliable direct drive, and far less parts.
--- Quote from: robrenz on July 13, 2012, 04:14:15 am ---
--- Quote from: saturation on July 12, 2012, 11:10:46 pm ---Eyeballing Proxxon reviews on Amazon.com, for 115/E and IB/E units, ~ 25% complain [ 3 star or less reviews] of early failures with motors smoking as a fairly common symptom. Anyone experience this?
--- End quote ---
The parts listing on thier website shows a geared drive. That is why the spindle is offset from the body. It does not look like it would be very robust.
--- End quote ---
saturation:
Brushes wear proportionate to use. If they are cheaply made and wear, which I haven't found to be the case, they are easy to get a hold of, and worse can you can get any brush that is sized like it. I used to find them generic in Asia, and kept a box I never used I paid a $1 for 10 or so, just find the right size and shape.
The Dremels rotary tool has its faults, but the core design is simple, little can go wrong. Its basically unchanged for 50 years, and the current series 100,200 is identical to the Mototool series of 1992, and the 3000 is a just a 300 in a new body. Its principal advantage over Black and Decker or Chinese nameless clones, is the older technology is easy to fix DIY, modify if needed, its 'schematic' and part are 'open', and easily available. Its like the VW bug of cars, if you don't mind a VW bug.
It will pay for owners to disassemble and understand how it works, and were it can fail.
I've seen other people's problems with it most due to job sizes that were better off with a die grinder, or often misused: applying pressure to the wheel/bits to speed up a work, then complain of rapid wheel wear or the motor bog down, both tasks accelerates wear on the drive system, overheat the chassis, and premature fail any electronics.
Worse case the parts are fairly cheap and easy to acquire in the USA, the Mexican parts, particularly the rotor and stator are reliable, but like others before it, unsealed [ so it can get fatally dirty when grit enters the motor]; its basically a universal brushed motor with a on/off switch or a light dimmer [ variable control], it can easily be bypassed with wires and solder, then later add an external light dimmer to provide continuously variable control.
Thus, the cheapest basic 275 or 100 model kept clean and given a supply of brushes, will most likely die from mileage related use, and far less than quality defects.
--- Quote from: DaveXRT on July 13, 2012, 12:23:11 am ---I only know dremels suffer from premature brush failure, fake or not.
--- End quote ---
T4P:
Or it can be due to stress from incorrect brush tuning- Actually, i mean positioning
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