Nwgs

JTknives

JTknives

Joined
Jun 11, 2006
Messages
8,651
I got the plans on sat and i have gone over them with a fine tooth comb and there is onley one thing i can say

:eek:IT'S SO EASY A CAVEMAN COULD DO IT:eek:

If your thinking about getting a set of these plans dont even think about it just do it. very very well'ley thought out. very discriptive and easy to fallow. i must say I think that this grinder will be probabley one of the best because its not welded so its very easy and quick to add or change it.

I do have a question though, in the motor section it says its designed for 1750 rpm motor but if you use a speed control on it you would still have to use a steep up pully to get a top speed of 4000 sfpm where if i used my 3hp dc 3500 rpm i would just use the same pully on each shaft and top speed would be around 4000. would this give me more tork at lower speed because the motor is running faster?
 
JT,

You would need to know the power of the 1750rpm motor to make a comparison between the two, but essentially as you reduce your speed (via belts or gearing) your torque goes up, if the motor itself is running at the same nominal speed.

Use Power=Torque X Angular velocity

Using VSD's is a different kettle of fish which I dont know a lot about in terms of outputs.

Good luck!

Lang
 
Okay, I guess that those cavemen got one over on me :eek:. It's obvious that you are talking about a grinding system, but what does NWGS stand for :confused:?

Thanks :D
 
Yes, you would be better with the DC motor. Gearing the 1750 motor up reduces the torque by half.
Stacy
 
Sorry, just went back to the original post and realized he posted an estimated cost for the grinder parts. Thanks to Tracy Mickley.
-Mike
 
I just received my plans today and looks like even I could build it. Very clear instructions and drawings. Now to start gathering stuff.
 
JTknives said:
I got the plans on sat and i have gone over them with a fine tooth comb and there is onley one thing i can say

:eek:IT'S SO EASY A CAVEMAN COULD DO IT:eek:

If your thinking about getting a set of these plans dont even think about it just do it. very very well'ley thought out. very discriptive and easy to fallow. i must say I think that this grinder will be probabley one of the best because its not welded so its very easy and quick to add or change it.

I do have a question though, in the motor section it says its designed for 1750 rpm motor but if you use a speed control on it you would still have to use a steep up pully to get a top speed of 4000 sfpm where if i used my 3hp dc 3500 rpm i would just use the same pully on each shaft and top speed would be around 4000. would this give me more tork at lower speed because the motor is running faster?
Click to expand...

I love ya man!..

I designed for 1750 max RPM motor taking into account that you will probably use a step pulley system to get the speed to nearly 4000RPM. This 1750 isn't hard and fast. It is just a point I picked out to keep from melting down the bearings by going too fast and to give some one that has NO idea about motors what to look for. Bearings can only go so fast, the faster they turn the hotter they get. When they get too hot, seals melt or your grease leaks out and they self destruct. This usually isn't a big problem with large contact wheels that have a large metal mass that act as a heat sink. Small wheels (1/2" range) don't have that mass and need to be kept down in speed. If you buy a 3600 RPM motor and slap a double or tiple speed pulley set up, you are going to have bearings burn out in the wheels and the pillow blocks in a fraction of the time you would other wise. Use any motor up to 2500 RPM and shouldn't have a problem at all.
 
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