Draw Bar II

[pat331]

I noted the nice job jb62901 did with his drawbar and thought I'd show the one I constructed about 6 years ago. Since I had the quick hitch, I built the drawbar to fit it. And since I hate to paint and only lived about 15 miles from a place that galvanizes steel, I had both the quick hitch and drawbar galvanized. I realized later that I had no way to hook up my 8,000 lb Warn winch, so I built the hitch receiver to fit over the 2" ball. So far the only thing that has broke was the winch when I tried to winch out a 20" log and it caught on a stump.

 

[handyman]

Nice be careful pulling that thing up a hill. My little b7100 would be doing a wheeley just hooked up to that trailer. Nice hitch thanks for pics.handy

 

[traildust]

Very nice build on the draw bar and haulling a goose neck!

I am a little confused about the winch. Where and how was that mounted?


Thanks,
Scott

 

[Eric McCarthy]

Pat get yourself a snatch block from A.W. Direct and place it on your winch line. The proper size snatch block will double your line's pulling power from 8,000 to 16,000lbs and it take some of the stress off the motor and gears.


http://www.awdirect.com/snatch-blocks-and-accessories/?hcs=snatch blocks

 

[traildust]

Pat get yourself a snatch block from A.W. Direct and place it on your winch line. The proper size snatch block will double your line's pulling power from 8,000 to 16,000lbs and it take some of the stress off the motor and gears.


http://www.awdirect.com/snatch-blocks-and-accessories/?hcs=snatch blocks

Hey, those are the same things used on come-a-longs. Never new they had a name though


Scott

 

[jb62901]

Thats it! Going down today and buy that M108s (4WD). I can build a larger hitch. Just kiden, thats a H~ll of a hitch, nice job...

 

[ptwyz]

That thing IS a beast

 

[dusty-t]

Hi Pat .Love that quick hitch. If I get the time and energy I want to build one. Thanks for the pics. Dusty

 

[Eric McCarthy]

Hey, those are the same things used on come-a-longs. Never new they had a name though


Scott

Yep, the more you have on a line the more weight you can move with less effort. Just like the old school block and tackle system.

 

[traildust]

Yep, the more you have on a line the more weight you can move with less effort. Just like the old school block and tackle system.

Eric,
What exactly is a block and tackle system


Scott

 

[Eric McCarthy]

Eric,
What exactly is a block and tackle system


Scott

Here ya go lil buddy
http://www.howstuffworks.com/pulley.htm

 

[traildust]

Here ya go lil buddy
http://www.howstuffworks.com/pulley.htm

Ok, now me gets it

Scott

 

[stuart]

Looks like this

http://en.wikipedia.org/wiki/Block_and_tackle

Stuart

 

[traildust]

Looks like this

http://en.wikipedia.org/wiki/Block_and_tackle

Stuart

Hey thanks Stuart!

Now when I put a winch on the back I just have to use this easy formula

S is the power in the hauling part.
P is the power gained by the purchase (this is the same as the number of parts at the moving block).
n is the number of sheaves in the purchase.
W is the weight lifted.
10 is the denominator of the fraction for friction. An arbitrary 10%.


Scott

 

[Butch]

There is an easier way to calculate the force needed to lift a known load based on a particular block and pulley system.

Count the number of lines attached to the load pulley this is your mechanical advantage. Example is you are lifting a 1000# load and there are 4 lines attached to the shive pulley attached to the load.... you'll have to muster at least 250+ pounds of pull on the winch to lift the load.

Looking at it in another way... to lift the load 1 foot you'll have to pull the winch rope end 4 feet, i.e. a 4:1 mechanical advantage...

 

[traildust]

There is an easier way to calculate the force needed to lift a known load based on a particular block and pulley system.

Count the number of lines attached to the load pulley this is your mechanical advantage. Example is you are lifting a 1000# load and there are 4 lines attached to the shive pulley attached to the load.... you'll have to muster at least 250+ pounds of pull on the winch to lift the load.

Looking at it in another way... to lift the load 1 foot you'll have to pull the winch rope end 4 feet, i.e. a 4:1 mechanical advantage...

Ok, I think I'm with you on this. Looking at this picture the rope is threaded three times on the upper and lower pulleys. So would that count as six?
And if it is six, then a person lifting 1,000 pounds is actually exerting the force of 166.6 pounds. Also he would have to pull the rope six feet to get one foot of lift.

Thanks Butch!

Scott

 

[Will In Tx]

Ok, I think I'm with you on this. Looking at this picture the rope is threaded three times on the upper and lower pulleys. So would that count as six?
And if it is six, then a person lifting 1,000 pounds is actually exerting the force of 166.6 pounds. Also he would have to pull the rope six feet to get one foot of lift.

Thanks Butch!

Scott

Yes, the more times you sheave a block the more slowly it will go up or down, etc.. But if you need to do it then it is there for raw working force.
Remeber to check the cables or straps and even rope your using before doing a lift or pull.
http://practicalmaintenance.net/?p=626

Will

 

[traildust]

Yes, the more times you sheave a block the more slowly it will go up or down, etc.. But if you need to do it then it is there for raw working force.
Remeber to check the cables or straps and even rope your using before doing a lift or pull.
http://practicalmaintenance.net/?p=626

Will

Hey Will, Thank you very much for that reply. Seems like you would almost need a person to trade off with while hauling something at such a ratio.


The link you provided to that site is very interesting and a keeper for the book mark list.



Thank you,
Scott

 

[Will In Tx]

Hey Will, Thank you very much for that reply. Seems like you would almost need a person to trade off with while hauling something at such a ratio.


The link you provided to that site is very interesting and a keeper for the book mark list.



Thank you,
Scott

Traildust

Been a heavy equipment operator before and it included rigging and operating the RT/Tracked crane so I thought I throw it in and glade some one liked it!

Will

 

[traildust]

Traildust

Been a heavy equipment operator before and it included rigging and operating the RT/Tracked crane so I thought I throw it in and glade some one liked it!

Will

Will, I knew it! I even had the question asking if you operated cranes in my last post but deleted it. The link you sent so quickly was the give away


Scott