Posted by Paul in MN on August 08, 2008 at 20:05:33 from (207.224.88.88):
In Reply to: H Drawbar posted by GordoSD on August 08, 2008 at 10:25:22:
Gordo,
It may be difficult to bore that hole with a drill bit. Depending on what kind of welding rod or wire was used, it may have many hard inclusions. I would try to go about 150 RPM and keep the drill pressure as high as possible (use plenty of cutting oil).
I welded up the very oblonged hole on the drawbar of my H. But I kept building weld in the elongated part of the hole..let it cool a bit..weld a bit more. Then to smooth it out, I used a carbide die grinder and got it pretty round.
Later I found a welder's trick that would have saved much time. You can buy carbon rods of common diameters (kind of like when we took big dry cells apart as kids). You put the carbon rod in the hole you are rebuilding and weld right up to the rod. The liquid steel does not run away or burn through the carbon rod. Use multiple passes until you have the top weld surface higher than the top of the drawbar. Same on the bottom. Let it cool a bit and smack out the carbon rod. It will shatter and you will have to use a small punch to get the pieces out, but you will have a good round hole and no machining necessary. I wish I had known this before I welded up my H's drawbar hole. Oh well, there will be other tractors with worn drawbars.
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