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Correct reamer size for W-1007C 3/8 or 9.5 mm?

J

JDA_BTR

Well Known Member
The plans have us ream the W-1007C hole on the rear wing spar to 3/8, or 9.5 mm; problem is:

3/8": 0.375
9.5mm: 0.374

Both are available. The 0.374 is an "undersize" reamer. Which one is correct for this application?
 
A 3/8" reamer better be OK. That is what I used. If it made a difference, then the plans should not say 3/8" reamer.
 
An-6

Gil. If using the .374 reamer for the #6, what size
should the pilot bit be in the final cut before reaming?
 
The plans have us drill to 11/32, then ream to 3/8 (9.5mm); so by the plans the drill is 1/32 under. 11/32 is 0.344.

For the 3/8, that is 0.031 under, and for the 9.5 mm that is 0.030 under. I don't think my drill press is perfect though. It probably is slightly off, but I can't tell how much.
 
Last edited:
JDA_BTR said:
The plans have us drill to 11/32, then ream to 3/8 (9.5mm); so by the plans the drill is 1/32 under. 11/32 is 0.344.

For the 3/8, that is 0.031 under, and for the 9.5 mm that is 0.030 under. I don't think my drill press is perfect though. It probably is slightly off, but I can't tell how much.
Click to expand...

Follow the plans :) my numbers were from a generic machinist's handbook chart.
 
The answer from Van's was just go with the plans and ream to 0.375; the bolt callout is in the finish kit plans which are not yet available. AN6 or NAS not yet specified. I was also advised that I could wait until later to make sure.

I'll go ahead and go with the 3/8 called out in the plans. Other people have done that ahead of me and we will all have the same issue if it was supposed to be different!
 
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