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Thread: RF30 captive drawbar questions
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25th March 2020, 06:40 PM #1Most Valued Member
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RF30 captive drawbar questions
This isn’t a question about how to make it work, I’ve already done that. But my first design had some challenges and I’m in to version 2.
The original design broke because I had too large a roll pin in too small a diameter and the shaft snapped.
So I’m in to creating a new one with better tools and methods (I have a reamer and hex collet block this time).
Here’s the setup:
It’s a 12 rod, turned down to 7mm at the end. An M14 boot with a 7mm reamed hole and a top nut (yet to be made) that will be pinned to the shaft.
Questions:
1. I’m toying with the idea of using thrust bearings on the top and bottom of the captive bolt. Is this a good idea or unnecessary complication?
2. I’m planning on using a split pin to attach the top nut to the shaft. What’s the best way of drilling this hole and keeping all the parts aligned as I do it? I was thinking of using loctite and then drilling through the whole setup before breaking it apart, cleaning and pinning?
3. I was going to use a 3mm roll pin? Is that sturdy enough? Want to make sure I don’t break the top part like I did last time but make sure it won’t shear
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