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18th February 2020, 09:14 AM #1
Stripped thread in old jointer head
Not sure if I'm using the right name for the part, but the blocks that hold the blades in place in my old 6" jointer, the bolts appear to be stripped (At least one of them in each of the three blades) has anyone dealt with this before, how did you do it? tap it? Any thoughts appreciated. The photo isn't of mine, it's of a restoration from Youtube (the font of knowledge..)
jointer.jpg
Many thanks!
Simon
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18th February 2020, 09:22 AM #2GOLD MEMBER
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Buy a helicoil kit and repair the stripped threads.
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18th February 2020, 10:24 AM #3
Thanks, you wouldn't tap it and put new bolts in?
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18th February 2020, 10:31 AM #4GOLD MEMBER
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Tapping it to a new larger size might result in bolt heads that don't fit.
Apart from the initial cost of the kit it is the same amount of work with helicoils and you retain the original bolt size.
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18th February 2020, 10:34 AM #5
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18th February 2020, 03:37 PM #6
For peace of mind I would just get all new oversize bolts and retap to suit. I am mindful that they are holding blades spinning at few thousand revs.
Regards
John
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18th February 2020, 05:11 PM #7SENIOR MEMBER
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Presuming that the thread in question is in the metal strips where the bolts are currently (like my planer) I would take the strips to a engineering shop and get new ones made. May not cost a lot more than a helicoil kit.
If one thread is stripped the others are likely worn. All threads for high speed machinery like this should be in A1 condition and that includes the bolts. Get new ones there as well.
The thread below by LS Barker gives a few of his thoughts on setup of square head machines, but many of the principles apply to all, see paragraph about 2/3 of the way down the first post. (4140 is a high tensile steel)
Tony
The Square Head Thread.You can't use up creativity. The more you use, the more you have. ~Oscar Wilde
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20th February 2020, 09:52 AM #8
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20th February 2020, 09:14 PM #9
Make sure you get high tensile bolts to put in the new strips as they prevent the threads from stretching which leads to stripping.
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