Yes, that's it. Gselectric has interesting info about universal motors. I still don't know if they will have exactly my requirements, but at least I can read something about universal motors. Thanks jbartos. If you have some other similar web reference (your "etc") it will be of help...
I have had a look in your web page and is very useful!. For example, just to specify more clearly the meaning of my first question, take last page of your link at "Machining parameters" (Mitsubishi carbide), I tried to find the kc (cutting resistance) for wood, only metals appear...
I have done some more investigation about the issue with power tool makers. You can always order spare rotors and stators separatelly without the bearings and so on, so I assume this is the reason because they don't use to give the specs. I need to know then 1.How to assembly properly both parts...
Well, the equation should be valid for its purpose, and the only application can be to have a relation force-chip dimensions, so you are totally right, I need to be more specific.
My particular application is a wood milling machine with 4 mm thickness of blade and around 104 mm diameter, this...
Thanks, Viktor. Yes, that's the definition. Usually it is used K= k.R (where R is the standard tensile strength and k an adimensional constant for the material). We have also S= w.t (where w is the width and t is the thickness of the removed chip).
Probably it is true your first statement, I can find universal motors from power tool manufacturers, but...where to obtain detailed specs in the web? (I mean drawing and speed/torque/power/current characteristics).
Usually, in machining calculations, the cutting force made by materials are calculated this way:
F = K . S
Were K is the machining strength of the material to be cut (N/mm2) and S is section for the removed chip.
K is tabulated usually for steel and metals in a lot of books, however I need to...
Thanks for the Merkle-Korff reference, their web page looks really good. However, the motors they manufacture seem to have much less power and speed than required, the other thing is that I need the motor to be universal. Notice the motor power must be 1,2 hp (900W) and speed 10,000-35.000 rpm...
Universal motors are really difficult to find because all manufacturers divide their catalogues according AC or DC motors. So, where should I look for universal motors in the catalogues?. I would appreciate as well if someone can give me some sources to get more info about universal motors.
Thanks a lot, jbartos, I already knew Groschopp but not the other two references. I have already e-mailed them as they don't have online catalogue.
Jon, your info can be as well very interesting for me. This motor is for a power tool project. The problem is that I don't know how to e-mail you...
Yes, in fact, that's a problem. It is relative easy to find a list of manufacturers for the specs I gave, but none of the motors they make are "small", for your info, the universal motor should have around 10000-36000 rpm. I have been looking in a lot of searchers with no success.
I am looking for that electric motor for a power tool design, so must be as small as possible (around 30 mm diam.). I need manufacturer's and detailed characteristics of the motor.
