IowaRV9Dreamer
Well Known Member
Can I dimple my aileron spar A-903? I dimpled my wing rear spar W-907 with no ill results. I know they are shaped a bit differently (slightly different angle) but my small diameter dimple die seems to fit in there ok.
The manual is no help here:
In the Wing Skin Preparation & Assembly section of the manual, it says Dimple the 0.040" rear spar and "ream out" the dimpled holes slightly with a sharp deburring bit or machine countersink. This "reaming" operation removes just a small amount of metal to make the skin dimple fit better and is not critical...
Yet in the aileron section, the manual states Machine Countersink the A-903 Spar Flanges (this will prevent bowing the spar that can be caused by dimpling since it is 0.040" thick).
Why the difference? Has anyone tried this?
The manual is no help here:
In the Wing Skin Preparation & Assembly section of the manual, it says Dimple the 0.040" rear spar and "ream out" the dimpled holes slightly with a sharp deburring bit or machine countersink. This "reaming" operation removes just a small amount of metal to make the skin dimple fit better and is not critical...
Yet in the aileron section, the manual states Machine Countersink the A-903 Spar Flanges (this will prevent bowing the spar that can be caused by dimpling since it is 0.040" thick).
Why the difference? Has anyone tried this?
if you feel the bump in a pnuematic squeezer you may be over doing it. you can look at the edge of a dimple on a sample and very closely examine it to see if the yoke spreading and side loading the dies causing a problem.it will be noticeable on the area of the dimple that was in the throat of the yoke. this displaces metal and acts as a stretcher, giving the opposite effect of a flute. you should barely feel a bump( when the squeezer roller comes over center) with no evidence of side loading. good luck gotta go build baffles 
