Quote:
Originally Posted by camtunkpa
Andy the revision looks pretty good. Are there going to be longer bolts included in the upgrade or do you feel the current bolts will be long enough even with the bolt recess change?
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Today we tried to duplicate what the new pulley will behave like with the shorter thread engagement. We produced these results using the same screws, but using 3 #10 washers that were approximately .04 thick.
Once this was in place, we screwed a standard AndyMark hub, with a hole drilled through the bore, to the pulley. We then used wire ties to form a loop which we could use a force gage with.
Clamping one half of the pulley in a table top vise, we pulled on the other with the force gage and maxed out at 104.2 lbf. We did not want to push our force gage further as it was only rated to 110 lbf. At 104.2 lbf, we did not see any separation between the halves, and believe that the reduced thread engagement should suffice.
To verify this, we duplicated the washer set up with 8 more of the Rev 3 pulleys and have placed them on our test bot and have been running that around today, as well as doing other testing with it.
I have not been involved with that testing, however we will have more information on that coming soon.