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#16
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Re: Thunderhex and Thunderhex Bearings
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#17
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Re: Thunderhex and Thunderhex Bearings
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Anyhow, for us it's now a standard practice to take some emory cloth and shaft stock and run it on the lathe for a second or two before fitting into bearings. Just enough to strip the anodize layer off should do it. (We also use the "tight press" bearings because they are so cheap in 11-packs) ThunderHex is way, way, way better than regular hex. I'll never go back to regular hex bearings - they are a pain to fit, a pain to align, and they are far harder to fix the shaft for if they fit too tightly. |
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#18
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Re: Thunderhex and Thunderhex Bearings
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Thanks for the feedback. I'm leaning this way myself. Hearing confirmation from others is re-assuring. |
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#19
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Re: Thunderhex and Thunderhex Bearings
I have used shrinking to fit thunderhex into bearings before. I used liquid nitrogen(-320 F) to do it, but dry ice(-109 F) should do just fine and a lot of grocery stores carry it.
Aluminum shrinks/expands ~0.001"-0.0015" per inch per 100 degrees F, which you can get about 1 thou shrink with dry ice or about 2 with liquid nitrogen. |
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#20
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Re: Thunderhex and Thunderhex Bearings
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It could even just be our wheels too. I've been too busy with other parts of the robot to address the seemingly trivial problem that is axle size. We're just happy we didn't need to slice of faces of the shaft on a mill this year We also get hex shaft from a local metals warehouse, Discount Steel. They may or may not ship to your area... but if you have a local metals warehouse I'd imagine they would have hex shaft. If you do have a shop nearby bring hex bearings and test them on the shafts before you buy them Last edited by BumblingBuilder : 06-02-2017 at 12:41. |
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#21
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Re: Thunderhex and Thunderhex Bearings
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Thanks! |
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#22
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Re: Thunderhex and Thunderhex Bearings
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To all the teams struggling with hex shaft and bearings, here are some tips I've accumulated over the past year on the subject:
Last edited by ClockworkGold : 06-02-2017 at 13:36. Reason: More bearing information, also spelled carburetor wrong |
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#23
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Re: Thunderhex and Thunderhex Bearings
This will be our 3rd year using thunderhex. All of our old stock had to be polished to fit bearings. The new stock from this year seems to fit fine.
If the bearings fit before tapping then don’t after tapping, the tap needs thrown away. The tap is deforming the material not cutting it. Anodize is very abrasive on cutting tools. Mr. Mike |
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#24
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Re: Thunderhex and Thunderhex Bearings
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#25
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#26
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Re: Thunderhex and Thunderhex Bearings
Based on our experience last year, this year, and reading others. I think you need to use the Thunderhex bearings, always. You can always throw any hex you have on the lathe and turn it down or sand it down to the 13.75 or 13.73 mm you need.
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#27
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Re: Thunderhex and Thunderhex Bearings
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We have old and new Thunderhex and if you do not drill out prior to tapping we have seen it expand, but not if we drill out with #7 before tapping. |
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#28
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Re: Thunderhex and Thunderhex Bearings
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All the Thunderhex being used was purchased this season. |
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#29
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Re: Thunderhex and Thunderhex Bearings
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#30
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Re: Thunderhex and Thunderhex Bearings
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