David-aviator
Well Known Member
Miles Bowen and David Buntin got my attention in another thread by suggesting dimpling with the blue plastic not removed was not a good idea. I dimpled with the blue material not removed after seeing some scratches between holes on the HS. With the VS there are no scratches, just what is desired with a plan to polish the airframe.
Well, this morning while working on the rudder and its stiffeners I decided to do a test with and without the material removed. Each stiffener has 11 dimples which were measured after dimpling. (The micro meter is mechanical but checked out OK by confirming the thickness of the material at .025.)
Here are the results of measuring the dimple depth of the 11 holes in each of the two pieces.
Dimple with blue stuff removed,
.052,.055,.053,.054,.052,.055,.054,.055,.053,.054,.054 (average .0537)
Dimple with blue stuff not removed,
.052,.054,.051,.050,.051,.053,.053,.053,.050,.052,.052 (average .0527)
There appears to be a slight difference, .001 less depth with the blue stuff not removed. As far as the rivet resting in the dimple, I can not tell a difference comparing the HS (no plastic) with the VS (dimple with plastic).
Not all the set rivets are perfect but that probably has more to with my solo riveting that the quality of the dimple.
I thank Miles and David for expressing their concern but my prime concern here is a neat surface and to that end I will continue dimpling with the blue stuff in place.
PS The date and time of the camera are not set correctly, the image was taken this morning. I was too tired to do it last night.
Uploaded with ImageShack.us
Well, this morning while working on the rudder and its stiffeners I decided to do a test with and without the material removed. Each stiffener has 11 dimples which were measured after dimpling. (The micro meter is mechanical but checked out OK by confirming the thickness of the material at .025.)
Here are the results of measuring the dimple depth of the 11 holes in each of the two pieces.
Dimple with blue stuff removed,
.052,.055,.053,.054,.052,.055,.054,.055,.053,.054,.054 (average .0537)
Dimple with blue stuff not removed,
.052,.054,.051,.050,.051,.053,.053,.053,.050,.052,.052 (average .0527)
There appears to be a slight difference, .001 less depth with the blue stuff not removed. As far as the rivet resting in the dimple, I can not tell a difference comparing the HS (no plastic) with the VS (dimple with plastic).
Not all the set rivets are perfect but that probably has more to with my solo riveting that the quality of the dimple.
I thank Miles and David for expressing their concern but my prime concern here is a neat surface and to that end I will continue dimpling with the blue stuff in place.
PS The date and time of the camera are not set correctly, the image was taken this morning. I was too tired to do it last night.
Uploaded with ImageShack.us
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