Edge distance for F-796B

[Draker]

I've gone through a couple of angles, having a heckuva time getting correct edge distance on the F-796B angle that holds the fuel tank attach bracket. This angle nestles against the F-902 bulkhead in such a way that maintaining edge distance on the lower (#12 screw) hole is impossible. I'll see if I can get some pics of my "best" effort. Lots of scrap being produced on this one. Any tips? Anyone have a picture of a correctly constructed piece?

[wirejock]

I have a couple photos and a description on my blog if it helps. I do remember it was a pain. More pain trying to get at the nuts. I made a set of this wall sockets for that. Buy sockedits from the Thrift Store and grind them down. Cheap tools.

[Draker]

Thanks again, Larry. Yours actually looks as close to the edge as mine. Might have to double check my measurement. I?m still afraid once I open it up to #12 I bust distance.

[PilotjohnS]

I had the same dilemma, even ordered parts to remake. But a quick email to Vans and they replied with a return phone call and we found an adequate solution. Great service from Vans support. And now it is documented, so if there ever is a question, I have an official response.

[wirejock]

Originally Posted by Draker

Thanks again, Larry. Yours actually looks as close to the edge as mine. Might have to double check my measurement. I?m still afraid once I open it up to #12 I bust distance.

Ryan
Keep us posted. If it's nested right in the space there's nothing else that can be done. A call to Vans to document as mentioned might be in order. I still think I hit the edge distance because I always mark parts before drilling.
That said, there's several places on the fuse where it was impossible and I asked Vans to confirm.

[mfleming]

Originally Posted by PilotjohnS

I had the same dilemma, even ordered parts to remake. But a quick email to Vans and they replied with a return phone call and we found an adequate solution. Great service from Vans support. And now it is documented, so if there ever is a question, I have an official response.

So for all the builders that we see this thread and have the same dilemma ....please share Van?s solution

[Draker]

Advice from Vans was to get as much edge distance as possible.

If you do the math it?s actually impossible to get sufficient distance:

According to the plans, the holes must be centered 15/32" from the forward edge of the angle. Since this is 3/4" angle, this means the hole must be centered 3/4? minus 15/32" = 9/32" from the aft edge of the angle. The plans also suggest the center of the hole is approx. 9/32? vertically from the top edge.

The final size of these holes will be 3/16" and #12. A 3/16" hole centered 9/32? from an edge leaves 3/16? edge distance which is obviously too small. That?s the best case if you?re right on the money with your drilling. Best I got was 5/32? and I?m going to leave that as is.

[Tommy123]

I can't understand why vans uses fractions when industry standard is thousands of a inch. It's not like the scales are rare.
I worked at falcon jet for a few weeks, **** millimeters!