Belt speed formula (?)

In an astonishing coincidence, I'm in the process of setting up my new Kalamazoo grinder, and I wrote a Java applet to calculate this very thing! It's also pretty easy to set up in Excel, if you have that.



Just type in the bold text and fill in the blank boxes with the appropriate numbers for your setup. The forumulae in B5 and C5 will give an error message until the the motor speed, pulley diameters, and drive wheel diameter are entered.
 
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bladsmth said:
Scott
You appear to have made the velocities multiplicative. They are additive.
The sum is 640.52 Km/s. The speed of light is 299,792.458 Km/s
If you are on an airplane traveling at 500 Km/s, and you sprint down the aisle at 20Km/s, you are not going 10,000 Km/s. You are only going 520 Km/s.

You are correct in noting that at any one time, all the parameters are not linear. The layman's translation of that is," Sometimes the stars line up, and sometimes they don't."
Stacy
Click to expand...

640.52 is in meters per second, not Km per second. I transformed 640.52 m/s to mph arriving at 1452.8026 mph. 152.8026 mph is equivalent to 5,158,089.4 miles per second. Which when multiplied by 5280 (feet in a mile), arrives at 2.72347112 (e+10) feet per second.
 
bladsmth said:
Scott
You appear to have made the velocities multiplicative. They are additive.
The sum is 640.52 Km/s. The speed of light is 299,792.458 Km/s
If you are on an airplane traveling at 500 Km/s, and you sprint down the aisle at 20Km/s, you are not going 10,000 Km/s. You are only going 520 Km/s.

You are correct in noting that at any one time, all the parameters are not linear. The layman's translation of that is," Sometimes the stars line up, and sometimes they don't."
Stacy
Click to expand...


That would depend if you are sprinting towards the front or rear of the plane :D
 
scottickes said:
640.52 is in meters per second, not Km per second. I transformed 640.52 m/s to mph arriving at 1452.8026 mph. 152.8026 mph is equivalent to 5,158,089.4 miles per second. Which when multiplied by 5280 (feet in a mile), arrives at 2.72347112 (e+10) feet per second.
Click to expand...

I think you may wanna recheck that one
 
In my plane example, I used Km/s and meant Km/h a plane flying at 500 Km/s would be fast indeed ( about 50 times escape velocity).A good sprinter can do 20Km/h easily, but 20 Km/s would put superman to shame ( about 20 times faster than a speeding bullet).

Scott - the sum of all velocities in the example is indeed 640.52Km/s ,not 640.52M/s. It sounds unbelievable fast, but on a cosmic scale ( considering the distances involved) it is actually quite leisurely.
Stacy
 
bladsmth said:
In my plane example, I used Km/s and meant Km/h a plane flying at 500 Km/s would be fast indeed ( about 50 times escape velocity).A good sprinter can do 20Km/h easily, but 20 Km/s would put superman to shame ( about 20 times faster than a speeding bullet).

Scott - the sum of all velocities in the example is indeed 640.52Km/s ,not 640.52M/s. It sounds unbelievable fast, but on a cosmic scale ( considering the distances involved) it is actually quite leisurely.
Stacy
Click to expand...

No matter what the math is, we'd be hand sanding very, very fast.
 
Scott,
I think you got my point, but to make it clearer to others.....
The relative speed of a belt grinder, or hand sanding, is very,very, slow compared to the speed of the cosmos.While you are slowly sanding back and forth, you are unknowingly zipping through the universe at enormous speeds.

Well I guess I have totally hijacked this thread. Enough side chatter.

Stacy
 
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