[eagleengineering] Re: shooter belts
- From: scott morgan <thriteenthmonkey@xxxxxxxxx>
- To: eagleengineering@xxxxxxxxxxxxx
- Date: Tue, 7 Feb 2006 20:44:02 -0800 (PST)
I just checked the specs these fp motors are actually more powerfull than
previous years, but I guess we'll see if that will make a difference
at 8,000 rpm the motors have a torque of .2 Nm
*2 motors* 5:1 gear reduction= 2 Nm
the pulley has about a 2 inch radius which is equal to about .051 meters
2/.051= 39.2 newtons
our ball weighs .185 kg but I'm going to go with .2 do to the tolerances of the
manufacturing process
the accelration of the ball will be 39.2/.2 m/s^2=196 m/s^2
the travel of the ball along the belts will be 25/2-6.3(the circumfrance of a
pulley*2 pulleys) + 4 inches (the radius of a pulley* 2 pulleys)
which comes out to 10.2 inches
which is equivelent to .259 meters
we can now calculate the time that it will take the ball to accelerate across
the belt
.259=1/2*196*t^2
.259=98*t^2
.259/98=t^2
.0026=t^2
.051=t
the ball will accelerate for a period of .051 seconds
which allows us to solve for the final velocity of the ball
which is 9.996 m/s
so evidently I screwed up somehow either simply by assuming that the fisher
price motors had the same specs as this years or somewhere along the
mathmatical proccess
also I noticed yesterday that McMaster sells 75 inch v belts which I think
could be a possibilty for the loading mechanism however I'm unsure as to wether
or not it would be long enough for the second stage of the loader
Art Connolly <connollyar@xxxxxxxxxxxx> wrote: Before we order longer
belts, could we see the calculations. Potential problem with interior space
with longer belts. See an email I'm about to send.
Art
----- Original Message -----
From: Karen Hillblom
To: eagleengineering@xxxxxxxxxxxxx
Sent: Tuesday, February 07, 2006 7:23 AM
Subject: [eagleengineering] Re: shooter belts
well print out and order form and fill it out
make sure that the new belt can fit the existing pulleys
later
----- Original Message -----
From: scott morgan
To: eagleengineering@xxxxxxxxxxxxx
Sent: Monday, February 06, 2006 9:56 PM
Subject: [eagleengineering] shooter belts
according to some calculations I did today we will need to increase the
belt length from 25" to 35" in order to accelerate the ball up to full
speed in time
this was using 1800 rpm for the gearbox output
-Scott
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