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How are Rod-End Bearings dimensioned?

D

drewhottub

Active Member
Unfortunately I already installed all of my Rod-End Bearings. Now I realize that forgot to measure them, so that I can determine how much thread engagement I have left, after getting everything to fit up on the elevator push-rod.

This chart, from the VAN's website, does not specify how the Rod-End Bearing's are dimensioned! Is it dimension A, or dimension B?

Would someone take a look at this picture and help me out?

Click Here --> https://picasaweb.google.com/drewho...authkey=Gv1sRgCM25wbHgivH6-AE&feat=directlink

Thanks,

Andrew
 
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Bob, thanks for the quick response.

I do realize that the plans call for something like dimension "B" (from my link), but that doesn't necessarily mean that the chart that I show here, does --> https://picasaweb.google.com/lh/photo/AQeLKMvX7FHIT2I5xUc7Hxas8ZD2SvsSugjWQRt7ZyM?feat=directlink

What I'm saying is, I do understand that the plans in Section 11 dimension to the center of the Rod end Bearing, but I guess I'd like to see that explicitely dimensioned the same way, in the chart.

There has to be a way to get this explicitely confirmed! Any suggestions?

By the way, here's the chart, straight from the VAN's website (scroll to page 15 of 26)--> http://www.vansaircraft.com/pdf/Section_5_R10.pdf

-Andrew
 
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The part number you are showing MD3616M has an overall length of 2.219 inches. The length of the threaded portion ( which is what you are looking for )is 1.062 inches.
I'm no expert in rod ends, but after building an RV I'm an expert at reasearch. Look up the part number in another source (I used ACS catalog) and check the dimensions.
PS being nice gets more results.
Ron
 
Ron,

Thank you so much for answering my question. You've saved me some real work. I will take a look at that ACS catalog you mention.
Also, I receive your correction. I will reply with greater tact in the future!

Best Regards,

Andrew
 
I finally found my answer here ---> http://pdf.directindustry.com/pdf/r...rolling-element-bearings/16837-23422-_18.html

It looks like dimension B in my picture here ---> https://picasaweb.google.com/lh/photo/AQeLKMvX7FHIT2I5xUc7Hxas8ZD2SvsSugjWQRt7ZyM?feat=directlink

is equal to 1.812".

According to the plan's i'm supposed to start out with 1.125" of rod end stick out (step 11-6-4), as dimensioned to the bearing center hole (on the forward side of the elevator pushrod.)

My airplane actually has 1.1875" of rod end stick out to the rod-end bearing center hole; in order to attain the required 91.4 degrees of elevator bell crank angle.

Therefore 1.812" - 1.1875" = 0.6245" of engaged thread still remaining.

Since Ron was able to supply the total thread length of 1.062" (also shown at the link above ), I was able to calculate that half the thread length is 0.531".

Since I have 0.6245" of engaged thread still remaining, I'm better than the required rule of half of the threads engaged, in step number 11-7-2.

Thank you Ron, again for your help. I was able to avoid removing my elevator push-rod front Rod-End (since I have everything nicely adjusted), and yet at the same time, feel good knowing I'm meeting the minimum thread engagement!

Thanks again!

Best Regards,

Andrew Boyd
 
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