Trim pushrod construction

[Zzz]

I flubbed the bending of one of my elevator trim pushrods on my QB kit (tried to use my 3/8" Imperial bender and crimped the 5/16" tubing) and so I have to build a new one.

My question is about the construction of the threaded portion of the pushrod. I looked over the plans, and aside from seeing it depicted as a weld, I can't tell the exact construction. Is it just a short piece of 3/8" round stock welded to the end of the 5/16" .028 wall tubing, then drilled and tapped?

[Wayne Massey]

You can weld on an AN365 10-32 nut to the tubing:

[jaredyates]

Here are some pictures of that "bend first weld second" strategy I was telling you about. http://jaredyates.com/bearhawk/?p=679 http://jaredyates.com/bearhawk/?p=697

[M Jones]

Filling the tube with sand before bending might help to prevent crushing it by the way. This is how I bent 1/4" copper tubing to be used for fuel cap ram vents on my antique. Your results may vary...

[Zzz]

Here are some pictures of that "bend first weld second" strategy I was telling you about. http://jaredyates.com/bearhawk/?p=679 http://jaredyates.com/bearhawk/?p=697

For sure! I love that all the pics on your site are high res.

[Mark Goldberg]

I think I might have a set on the shelf Zane. The newest kits have these bends already done. Mark

[tf104]

I got some really nice threaded rod ends from http://www.chassisshop.com/

[Zzz]

I ended up rebuilding both, using rod ends on both ends as called for in the plans. Instead of circumferencially welding a piece of round to the end, I made some caps and rosette (or it is a plug?) welded them, then rolled my welds in the disc grinder.

[Robert440]

ZZZ, I like your thinking. I haven't started building yet but in the course of reviewing plans for
several months I've seen that there is a lot of this welding nuts onto the end of tubing instead of making threaded plugs or threaded caps such as you have done. Is there any reason for this other than with the nuts you have premade threads?


















zz

[Zzz]

ZZZ, I like your thinking. I haven't started building yet but in the course of reviewing plans for
several months I've seen that there is a lot of this welding nuts onto the end of tubing instead of making threaded plugs or threaded caps such as you have done. Is there any reason for this other than with the nuts you have premade threads?

Honestly, I don't know. Welding an AN315 is probably lighter. I liked the machined end caps sleeving over the end of the tube as it allows me to get the rod end threading into the tubing perfectly straight. I don't think I could get that thin nut squared up very well with my welding skills.

For what it's worth I believe the quickbuild kit pushrods use a piece of solid 3/8" roundstock drilled and tapped and welded to the end for this particular application.