needtobuildmore
Member
I've heard that white oak weathers a LOT better than red oak. How are you going to treat it to prevent rot?
cable operated dump trailer
- Thread starter Army grunt
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I've heard that white oak weathers a LOT better than red oak. How are you going to treat it to prevent rot?
weedpharma
Gold Member
- Joined
- Jun 21, 2008
- Messages
- 291
I am not a mechanical engineer so I ask those more knowledgable to comment on my thoughts.
The scissor hinge looks as though it comes to almost closed when it is down. If the centre pin is pulled, it appears to me that virtually all the force goes to pulling the hinge towards the drawbar and very little to actually opening the hinge. As the hinge opens, more and more of the force then gets applied to lifting the trailer bed until the hinge is nearly fully open when nearly all force is lifting the bed.
This makes me think that a very large force is going to be necessary unless the scissor is open at least say 30 deg when the bed is down.
Even on the scissor jacks supplied with cars, the jack is fairly open before any lifting takes place.
Weedpharma
The scissor hinge looks as though it comes to almost closed when it is down. If the centre pin is pulled, it appears to me that virtually all the force goes to pulling the hinge towards the drawbar and very little to actually opening the hinge. As the hinge opens, more and more of the force then gets applied to lifting the trailer bed until the hinge is nearly fully open when nearly all force is lifting the bed.
This makes me think that a very large force is going to be necessary unless the scissor is open at least say 30 deg when the bed is down.
Even on the scissor jacks supplied with cars, the jack is fairly open before any lifting takes place.
Weedpharma
SleazyRider
New member
- Joined
- Jun 7, 2010
- Messages
- 4
I'm curious to see how this trailer turns out. You have a nice project going on. Nice hinges, BTW.
Bob
Bob
Just2quickz28
Gold Member
I have a tilt / dump 4x8 trailer that I always wanted to add a mast to to make a cable dump trailer. Something along the lines of the NovaJack trailers
NovaJack
Keep us posted on how it your design works out
NovaJack
Keep us posted on how it your design works out
OP
Army grunt
Platinum Member
(The scissor hinge looks as though it comes to almost closed )It comes close, but its still open .there's alot of fores to start the pull then it gets less an less.
A good friend has designed a (5pully) block& tackle that will take 3" pulleys an 1/4" cable.Its at the place that will plasma cut it.Ill be gone up north to get my veterans service dog this weekend so Ill not post anything for a month or so.Ill be in training with her for 2 weeks.Ill keep you guys posted.
Ill treat the oak with Thompson water seal.
Army Grunt
A good friend has designed a (5pully) block& tackle that will take 3" pulleys an 1/4" cable.Its at the place that will plasma cut it.Ill be gone up north to get my veterans service dog this weekend so Ill not post anything for a month or so.Ill be in training with her for 2 weeks.Ill keep you guys posted.
Ill treat the oak with Thompson water seal.
Army Grunt
OP
Army grunt
Platinum Member
BruceWard
Platinum Member
Good work, thank you for your service!
LD1
Epic Contributor
Just now saw this post.
It is very interesting. But I am having my doubts that you will be able to get it to dump without some other way of getting that scissor started.
I would be curious to know what some of your measurements are with the trailer down. For example, what is the length from pin center to pin center for the upper and lower scissor arms?? Also what is the distance between the upper center and the lower pin center when closed.
Just guessing from the sketches but to give you an idea, an upper and lower arm length both being 16" and 4" between the pins in the front when lowered would require 14 times the amount of weight over the hoist to lift.
So say a 1000lb trailer with a 3000lb load would need 14*4000=56000lbs of force just to get the scissor started. Because as stated, when starting out, most of the load is not trying to lift, rather pull straight forward.
Needing that much force would require some pretty heafty pivots and hefty anchor points for the cable.
Again, this is just an example guessing at the measurments from the pics.
Another area of concern of mine would be the rear pivots. It looks like driveshaft yokes. I have never used them for something like this so I am curious as to how well they will hold up.
Good luck with the build. If you do decide to go with a hydraulic lift, you already have 90% of the work done.
It is very interesting. But I am having my doubts that you will be able to get it to dump without some other way of getting that scissor started.
I would be curious to know what some of your measurements are with the trailer down. For example, what is the length from pin center to pin center for the upper and lower scissor arms?? Also what is the distance between the upper center and the lower pin center when closed.
Just guessing from the sketches but to give you an idea, an upper and lower arm length both being 16" and 4" between the pins in the front when lowered would require 14 times the amount of weight over the hoist to lift.
So say a 1000lb trailer with a 3000lb load would need 14*4000=56000lbs of force just to get the scissor started. Because as stated, when starting out, most of the load is not trying to lift, rather pull straight forward.
Needing that much force would require some pretty heafty pivots and hefty anchor points for the cable.
Again, this is just an example guessing at the measurments from the pics.
Another area of concern of mine would be the rear pivots. It looks like driveshaft yokes. I have never used them for something like this so I am curious as to how well they will hold up.
Good luck with the build. If you do decide to go with a hydraulic lift, you already have 90% of the work done.
srs
Veteran Member
I second what Bruce said.
