Re: Re: Rubber cross-section from Warthodson_at_aol.com on 2013-09-17 ([Indoor

From: <Warthodson_at_aol.com>
Date: Tue, 17 Sep 2013 13:44:46 -0400 (EDT)

Bill, Mike or anyone,
But the catch-22 is that first you must accurately measure the width of the strip, then accurately set your slicer to cut a specific width in order to end up with a specific weight loop!
For the sake of this discussion, assume there is no max. motor weight requirement & you wanted a loop weight of 1 gram, what tolerance would you consider acceptable?
How many test cuts do you usually need when trying to cut a new width strip? I would say it typically takes me at least 3 short test strips.
Gary H

From: William Gowen wdgowen_at_gmail.com




        So you calculate the density of your 1/8" rubber and then calculate the strip width based on the density. I rest my case.


On 9/17/2013 10:50 AM, mkirda_at_sbcglobal.net wrote:



Here is an example for F1L.

              Find the loop length that you want. Cut a bit of rubber to be the length plus 2 inches.

              i.e. 14" loop, cut (14+1)*2 = 30 inch length = 15" doubled.

              Measure the width of the rubber with micrometer - i.e. 0.128"

              Weigh the length of rubber. i.e. 2.54 grams.

              You decide you want the rubber to weight 1 gram exactly.

              Here is the math:

              1/2.54 * (15/14) * 0.128 = .05399

              Strip it to 0.054" and you when you tie off a 14" loop it should be precisely 1 gram.


              I set up the spreadsheet to have only 1" additional length, but the math above is the same.

              If anyone has problems with this, I will define variables and post the math that way.

              Regards.

              Mike Kirda










Received on Tue Sep 17 2013 - 10:44:49 CEST