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Thomas PTO shear pins
Moderators: toaddog, TWISTY, V8Patrol, Moderators
Posts: 3725
Joined: Wed Jun 30, 2004 1:45 pm
Joined: Wed Jun 30, 2004 1:45 pm
Location: Blue Mountains, or on a rig somewhere in bumf*ck idaho
Thomas PTO shear pins
Can anyone tell me what material and diameter the shear pins are on a Thomas 9000lb PTO winch? I rang the suppliers today and they quoted me 5 bucks each for them. Which for a straight piece of brass (or whatever it's made of) seems a bit steep, considering they just cut it off a length of rod and there's no real machining or labour time involved
http://www.populationparty.org.au/
Re: Thomas PTO shear pins
$5 to know your getting the right tool for the job .. seems reasonable to me..rockcrawler31 wrote:Can anyone tell me what material and diameter the shear pins are on a Thomas 9000lb PTO winch? I rang the suppliers today and they quoted me 5 bucks each for them. Which for a straight piece of brass (or whatever it's made of) seems a bit steep, considering they just cut it off a length of rod and there's no real machining or labour time involved
" If governments are involved in the covering up the knowledge of aliens, Then they are doing a much better job of it than they do of everything else "
A mate had a similar problem with his Toyota PTO
http://www.outerlimits4x4.com/ftopic548 ... hlight=pto
http://www.outerlimits4x4.com/ftopic548 ... hlight=pto
Posts: 3725
Joined: Wed Jun 30, 2004 1:45 pm
Joined: Wed Jun 30, 2004 1:45 pm
Location: Blue Mountains, or on a rig somewhere in bumf*ck idaho
Thanks for the input guys.
I realise we're only talking about 15 bucks for a couple of spare pins here, but think about it -
If i find out what they're made of i can make as many as i like, and accordingly push my winch as hard as i like knowing that i can cheaply replace the pins.
A good quality high tensile bolt of a similar size is about 3 bucks and that has to be cast, threaded and heat treated.
Similarly a set of high tensile 8mm dowels for my hubs cost 2 bucks each. Every little bit counts
I realise we're only talking about 15 bucks for a couple of spare pins here, but think about it -
If i find out what they're made of i can make as many as i like, and accordingly push my winch as hard as i like knowing that i can cheaply replace the pins.
A good quality high tensile bolt of a similar size is about 3 bucks and that has to be cast, threaded and heat treated.
Similarly a set of high tensile 8mm dowels for my hubs cost 2 bucks each. Every little bit counts
http://www.populationparty.org.au/
in that case buy 1 for $5 and find out the size and material. Then source your own material and make additional spares. Do a write up on here as well.rockcrawler31 wrote:Thanks for the input guys.
I realise we're only talking about 15 bucks for a couple of spare pins here, but think about it -
If i find out what they're made of i can make as many as i like, and accordingly push my winch as hard as i like knowing that i can cheaply replace the pins.
A good quality high tensile bolt of a similar size is about 3 bucks and that has to be cast, threaded and heat treated.
Similarly a set of high tensile 8mm dowels for my hubs cost 2 bucks each. Every little bit counts
could always make up a jig to replicate the joint it fits into and shear test an original one and compare it to different materials.
An idea i had was to put a clutch in the shaft in place of the shear pin, have seen it talked about on here before, that way when max torque is reached the clutch pops out, a lot simpler to reset than crawl around replacing shear pins.
The clutch i'm on about is used in a lot of industrial applications to prevent damage to equipment, we use them where i work but not the correct size for a PTO winch - and i don't know how they go with dirt and moisture, may need a cover, so much to do so little time...
An idea i had was to put a clutch in the shaft in place of the shear pin, have seen it talked about on here before, that way when max torque is reached the clutch pops out, a lot simpler to reset than crawl around replacing shear pins.
The clutch i'm on about is used in a lot of industrial applications to prevent damage to equipment, we use them where i work but not the correct size for a PTO winch - and i don't know how they go with dirt and moisture, may need a cover, so much to do so little time...
There are no stupid questions, but there are a LOT of inquisitive idiots
Posts: 3725
Joined: Wed Jun 30, 2004 1:45 pm
Joined: Wed Jun 30, 2004 1:45 pm
Location: Blue Mountains, or on a rig somewhere in bumf*ck idaho
Size is easy really, i have the winch on my car after all, and it just needs to be an interference fit with the ends mashed over a bit. It's the material grade that is difficult and you can't work that out just by looking at it. Even if you know that it's Brass or Bronze, you need to know the grade, alloying properties and shear strength. I like the idea of the clutch disconnect, but like you say Patroler, so much to do so little timeTojo wrote:in that case buy 1 for $5 and find out the size and material. Then source your own material and make additional spares. Do a write up on here as well.rockcrawler31 wrote:Thanks for the input guys.
I realise we're only talking about 15 bucks for a couple of spare pins here, but think about it -
If i find out what they're made of i can make as many as i like, and accordingly push my winch as hard as i like knowing that i can cheaply replace the pins.
A good quality high tensile bolt of a similar size is about 3 bucks and that has to be cast, threaded and heat treated.
Similarly a set of high tensile 8mm dowels for my hubs cost 2 bucks each. Every little bit counts
http://www.populationparty.org.au/
Like you say, many intricacies to condsider. Just buy some. For a bloke that rakes in the big bucks on the rigs you are a tight arserockcrawler31 wrote: It's the material grade that is difficult and you can't work that out just by looking at it. Even if you know that it's Brass or Bronze, you need to know the grade, alloying properties and shear strength.
Posts: 3725
Joined: Wed Jun 30, 2004 1:45 pm
Joined: Wed Jun 30, 2004 1:45 pm
Location: Blue Mountains, or on a rig somewhere in bumf*ck idaho
Erm big bucks? I'm probably the lowest paid out here at the moment, and i'm an engineerDane wrote:Like you say, many intricacies to condsider. Just buy some. For a bloke that rakes in the big bucks on the rigs you are a tight arserockcrawler31 wrote: It's the material grade that is difficult and you can't work that out just by looking at it. Even if you know that it's Brass or Bronze, you need to know the grade, alloying properties and shear strength.
Besides, i've been put on notice about spending more money on my junk
http://www.populationparty.org.au/
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