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This is a very common mistake, I was thinking I will do the hole good to make it nice and round with a 5/16 reamer, for the AN 5 bolt, if you do this, it will have too much play, and in my case the wheel axle nut moved forward and back by 1/4 to 3/8 inch. in the plans, it says to use a .311 reamer, I did not see this, and others have missed this also.....now it is tight with no play. actually had to tap the bolt in, very snug!
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So I've heard people refer to a step reamer for the holes. Someone contacted me with one for sale. Is there a part number or tool number I should look for?
~Marc |
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That reamer will give you a .0012" interference fit. |
A reamer that is sized at 0.3261 will not fit a close tolerance bolt. That will fit an oversized bolt. The close tolerance bolt should be 0.312,
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Oh good catch. I had it in my head that the holes were out of tolerance already (i.e. drilled with 5/16"). Marc, if you're still within the limits of the nominal size bolt, then I guess my 1/64" oversize reamer will be of no use to you. |
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I don't know if the builder of my plane drilled the hole with a 5/16 bit as many people seem to do, but the landing gear do move around (back and forth). What bolts did you use Andrew? thanks ~Marc |
I used a "(PPRL-.3261) Long Piloted Reamer M42 Cobalt.3261" with a NAS6605-33X bolt.
You may want to start by pulling one of your bolts out to see what condition the hole is in. Is this plane already flying, or is it still being built? If you have the slop in your gear, you're going to need at least the 1/64" o/s. If it's really bad, you may even need the -Y 1/32" o/s. |
OK, here's what I found out:
The NAS6605-33X is the oversize, close-tolerance bolt to replace the stock AN5-24A. This is the first oversize bolt, and the grip is almost identical to the AM5-24A. If you drilled the gear with a 5/16 drill bit you probably need this size bolt. http://www.gen-aircraft-hardware.com...X&folder=basic The reamer to use for this bolt is either a PPR3261 or a PPRL(Long)3261. The short reamer is about 3½" long. I don't know how long the "L" version is but I will post it soon. http://www.gen-aircraft-hardware.com...1&folder=basic These are "Piloted" reamers, which means the end it turned down so when you put it through the tube, it serves as a guide to help ream the hole straight. The hole you end up with will be slightly smaller than the bolt, so you will have an interference fit. How much smaller depends on the bolt: There are min and max dimensions that the bolt must adhere to. You may need a rivet gun, mallet, or B-F hammer(just kidding) to install these bolts. They have nominal threads on the end so the same lock nut can be used. You may need a different washer on the grip area. There should be no movement in the joint if done correctly. ~Marc |
Deleted my post.......
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Today I received a "loaner" reamer (Thanks Andrew!). It's marked .3261. When I measured the grip on the bolts I bought from Genuine Aircraft Hardware, they measured .326 - Using my El-Cheapo digital caliper from Harbor Fright. :eek: Looks like there might be .0001 space to play with..... I'll post a follow up next week.
regards ~Marc |
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