Bolt Shear
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- Posts: 41
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- Location: Parry Sound Ont
Bolt Shear
So my snow blower drive shaft on my tractor has been running a double roll pin or spring pin 1/4 inch diameter X 2"
bent my auger badly last winter and roll pin did not break.7000 psi shear
14 hp Diesel
This summer I spent some nice days straightening everything out. When you don't get what you want you get EXPERIENCE!
I have replace the roll pin with a # 2 bolt shear of 2179 psi
if it breaks all the time I can got to a # 5 bolt with a shear of 3533 psi
Anyone have any thoughts ?
Easier to replace a bolt rather than all the bent auger parts I am thinking.
Thanks
bent my auger badly last winter and roll pin did not break.7000 psi shear
14 hp Diesel
This summer I spent some nice days straightening everything out. When you don't get what you want you get EXPERIENCE!
I have replace the roll pin with a # 2 bolt shear of 2179 psi
if it breaks all the time I can got to a # 5 bolt with a shear of 3533 psi
Anyone have any thoughts ?
Easier to replace a bolt rather than all the bent auger parts I am thinking.
Thanks
Re: Bolt Shear
Interesting! A few years ago I want through the same exercise with a friends auger. Driven by the PTO and hung on the three-point tractor mount. First went with the "weak" bolt trick, which worked. But when the bolt sheared the ends mashed over enough to jam the broken bit and make it hard to get out. So I used the lathe and a sharp 60* tool to cut shallow "shear grooves" in the bolt shank so the bolt would break cleanly and not jam. Now when the bolt shears the bits just fly out and the bolt is easy to replace.
Since then we found a slip clutch that goes in-line at the tractor PTO and, once adjusted, it slips instead of breaking bolts. Works great!! We leave the "nicked" bolt in place just in case and I think we've only broken one bolt in a couple of dozen holes.
This is a 22 hp machine and an 8" x 48" auger.
You might be able to apply this to your snow auger...
Pete
Since then we found a slip clutch that goes in-line at the tractor PTO and, once adjusted, it slips instead of breaking bolts. Works great!! We leave the "nicked" bolt in place just in case and I think we've only broken one bolt in a couple of dozen holes.
This is a 22 hp machine and an 8" x 48" auger.
You might be able to apply this to your snow auger...
Pete
Just tryin'
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Re: Bolt Shear
The manufacturer of my haybine specifies grade 5 shear bolts to avoid the "mashing over" problem.
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- Location: Farmington, NM
Re: Bolt Shear
As you note, bolts or pins are cheaper than the alternative. Our farm had a rock pile of a field and it was common to use several pins per tree hole. Went thought boxes of bolts but never messed up a gear box.
Then there was clown we know who got tired of replacing bolts and installed a really high strength one; the bolt survived - but nothing else did.
Then there was clown we know who got tired of replacing bolts and installed a really high strength one; the bolt survived - but nothing else did.
Re: Bolt Shear
Okay! Grade 5 not 8. thanks
Re: Bolt Shear
Worked in an Industry that had a good amount of experience with shear pins for their equipment. The shape of the groove influences how the pin breaks. A "V" breaks all at once where as a "U" releases more slowly.
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- Joined: Thu Jan 29, 2015 8:02 pm
- Location: Parry Sound Ont
Re: Bolt Shear
Hi everyone
Thanks for the replies, great replies. I don't have room for a clutch as its a front mount blower & just no room (great idea).
So I am interested in taking a gr 5 bolt and i can cut a grove on the lathe ( U or a V ) I am not sure ?
And how deep ?
For my walk behind blower Airens the shear bolts are square cut i think?
Thanks again
Sandman North
Thanks for the replies, great replies. I don't have room for a clutch as its a front mount blower & just no room (great idea).
So I am interested in taking a gr 5 bolt and i can cut a grove on the lathe ( U or a V ) I am not sure ?
And how deep ?
For my walk behind blower Airens the shear bolts are square cut i think?
Thanks again
Sandman North
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- Joined: Mon Nov 10, 2014 1:39 pm
- Location: Woodinville, Washington
Re: Bolt Shear
Sounds like the U shape groove would be ideal. It would cut less deeply also, allowing a bit more shearing force before breaking - hence more longevity, perhaps.
Glenn
Glenn
Moderator - Grand Scale Forum
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Motive power : 1902 A.S.Campbell 4-4-0 American - 12 5/8" gauge, 1955 Ottaway 4-4-0 American 12" gauge
Ahaha, Retirement: the good life - drifting endlessly on a Sea of projects....
Re: Bolt Shear
I use plain old cheepie hardware store bolts (grade 0.5? LOL!) on my John Deere 16HP and they work great. They don't let go in normal service but if the blower tries to eat a chunk of ice or a rock, they snap easily. John Deere even has a little bracket right on the blower to hold 5 additional bolts. Going on 40 years in service with nothing busted (except bolts).
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- Joined: Thu Jan 29, 2015 8:02 pm
- Location: Parry Sound Ont
Re: Bolt Shear
it all sounds good
I am going to the shop and cutting some now.
Thanks
I am going to the shop and cutting some now.
Thanks
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- Posts: 1852
- Joined: Tue Dec 06, 2016 4:05 pm
- Location: Elmwood, Wisconsin
Re: Bolt Shear
What does the manufacturer recommend? I use grade 5 on my haybine because that's what Matthews says to use. The bolt clamps two 3/4" plates in a location where a mashed-over grade 2 is *very* hard to remove (Made that mistake. Once.) Grooving does not seem necessary: the grade 5s snap off nicely. On other machines where the bolt clamps fairly thin plates with good access and the ability to separate the plates grade 2 works fine if it's strong enough. The bolt has to be a close fit in the holes and the shear has to be applied to the unthreaded shank, of course.spro wrote:Okay! Grade 5 not 8. thanks