LifeTrac IV Loader Lift Capacity - Revision history

Marcin: /* Retracted Position */

2011-12-07T02:43:09Z

Retracted Position

← Older revision		Revision as of 02:43, 7 December 2011
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	==Retracted Position==		==Retracted Position==

	Going through similar analysis except with theta prime = 49 degrees - impressive lifting capacity is shown with at least 12,000 lb of lifting power. This means that the tractor will tip forward readily when it tries to pick up objects beyond its tipping ~~capacity~~.		Going through similar analysis except with theta prime = 49 degrees - impressive lifting capacity is shown with at least 12,000 lb of lifting power. This means that the tractor will tip forward readily when it tries to pick up objects beyond its tipping point.

	=Needs=		=Needs=

Marcin: /* Retracted Position */

2011-12-07T02:42:22Z

Retracted Position

← Older revision		Revision as of 02:42, 7 December 2011
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	==Retracted Position==		==Retracted Position==

			Going through similar analysis except with theta prime = 49 degrees - impressive lifting capacity is shown with at least 12,000 lb of lifting power. This means that the tractor will tip forward readily when it tries to pick up objects beyond its tipping capacity.

	=Needs=		=Needs=

Marcin: /* Basic Analysis */

2011-12-07T02:40:21Z

Basic Analysis

← Older revision		Revision as of 02:40, 7 December 2011
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	Cylinder specification - see [https://www.surpluscenter.com/item.asp?item=9-6775&catname=hydraulic] : 2.5" diameter, 2500 psi, 36" stroke.		Cylinder specification - see [https://www.surpluscenter.com/item.asp?item=9-6775&catname=hydraulic] : 2.5" diameter, 2500 psi, 36" stroke.

	'''~~Force~~ calculations indicate over 12,000 lb of lifting force at the fully retracted position, and approximately 2000 lb at full height.'''		'''Torque balance calculations indicate over 12,000 lb of lifting force at the fully retracted position, and approximately 2000 lb at full height.'''

	=Torque Balance Calculations=		=Torque Balance Calculations=

Marcin: /* Basic Analysis */

2011-12-07T02:40:04Z

Basic Analysis

← Older revision		Revision as of 02:40, 7 December 2011
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	The red triangle models the geometry between 3 points: the cylinder to frame pin - loader to frame pivot - and loader to quick attach plate pivot.		The red triangle models the geometry between 3 points: the cylinder to frame pin - loader to frame pivot - and loader to quick attach plate pivot.

	The green line is the extended cylinder. The height of the loader arm pivot is 64 inches above the ground. The angle of the extended cylinder from the vertical is 21 degrees. The angle theta between the cylinder and the loader is 8 degrees in the fully extended position, and 49 degrees in the retracted position. The angle phi off vertical of the extended loader arms is about 21 degrees.		The green line is the extended cylinder. The height of the loader arm pivot is 64 inches above the ground. The angle of the extended cylinder from the vertical is 21 degrees. The angle theta between the cylinder and the loader is 8 degrees in the fully extended position, and the angle theta prime is 49 degrees in the retracted position. The angle phi off vertical of the extended loader arms is about 21 degrees.

	Cylinder specification - see [https://www.surpluscenter.com/item.asp?item=9-6775&catname=hydraulic] : 2.5" diameter, 2500 psi, 36" stroke.		Cylinder specification - see [https://www.surpluscenter.com/item.asp?item=9-6775&catname=hydraulic] : 2.5" diameter, 2500 psi, 36" stroke.

	Force calculations indicate over 12,000 lb of lifting force at the fully retracted position, and approximately 2000 lb at full height.		'''Force calculations indicate over 12,000 lb of lifting force at the fully retracted position, and approximately 2000 lb at full height.'''

	=Torque Balance Calculations=		=Torque Balance Calculations=

Marcin: /* Torque Balance Calculations */

2011-12-07T02:39:13Z

Torque Balance Calculations

← Older revision		Revision as of 02:39, 7 December 2011
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	=Torque Balance Calculations=		=Torque Balance Calculations=

			==Extended Position==
	Downward torque at cylinder-arm attachment is (assuming all loader weight is approximately at the end of the loader arms, and assuming cylinder attachment is approximately at the half way point on the arms):		Downward torque at cylinder-arm attachment is (assuming all loader weight is approximately at the end of the loader arms, and assuming cylinder attachment is approximately at the half way point on the arms):

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	The difference between up and down forces indicates a static lifting capacity of 2000 lb at full height.		The difference between up and down forces indicates a static lifting capacity of 2000 lb at full height.

			==Retracted Position==

	=Needs=		=Needs=

Marcin: /* Torque Balance Calculations */

2011-12-07T02:38:16Z

Torque Balance Calculations

← Older revision		Revision as of 02:38, 7 December 2011
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	The difference between up and down forces indicates a static lifting capacity of 2000 lb at full height.		The difference between up and down forces indicates a static lifting capacity of 2000 lb at full height.

			=Needs=

			Full tipping load anaylysis needs to be pulled out of the CAD model once it is complete from [[Mike Apostol]].

	[[Category:LifeTrac Scaling Calculations]]		[[Category:LifeTrac Scaling Calculations]]

Marcin: /* Basic Analysis */

2011-12-07T02:36:41Z

Basic Analysis

← Older revision		Revision as of 02:36, 7 December 2011
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	The red triangle models the geometry between 3 points: the cylinder to frame pin - loader to frame pivot - and loader to quick attach plate pivot.		The red triangle models the geometry between 3 points: the cylinder to frame pin - loader to frame pivot - and loader to quick attach plate pivot.

	The green line is the extended cylinder. The height of the loader arm pivot is 64 inches above the ground. The angle of the extended cylinder from the vertical is 21 ~~degeres~~. The angle theta between the cylinder and the loader is 8 degrees in the fully extended position, and 49 degrees in the retracted position. The angle phi off vertical of the extended loader arms is about 21 degrees.		The green line is the extended cylinder. The height of the loader arm pivot is 64 inches above the ground. The angle of the extended cylinder from the vertical is 21 degrees. The angle theta between the cylinder and the loader is 8 degrees in the fully extended position, and 49 degrees in the retracted position. The angle phi off vertical of the extended loader arms is about 21 degrees.

	Cylinder specification - see [https://www.surpluscenter.com/item.asp?item=9-6775&catname=hydraulic] : 2.5" diameter, 2500 psi, 36" stroke.		Cylinder specification - see [https://www.surpluscenter.com/item.asp?item=9-6775&catname=hydraulic] : 2.5" diameter, 2500 psi, 36" stroke.

	Force calculations indicate over 12,000 lb of lifting force at the fully retracted position, and approximately 2000 lb at full height.		Force calculations indicate over 12,000 lb of lifting force at the fully retracted position, and approximately 2000 lb at full height.

	=Torque Balance Calculations=		=Torque Balance Calculations=

Marcin: /* Torque Balance Calculations */

2011-12-07T02:35:53Z

Torque Balance Calculations

← Older revision		Revision as of 02:35, 7 December 2011
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	=Torque Balance Calculations=		=Torque Balance Calculations=

	Downward torque at cylinder-arm attachment is (assuming all loader weight is approximately at the end of the loader arms, and assuming		Downward torque at cylinder-arm attachment is (assuming all loader weight is approximately at the end of the loader arms, and assuming cylinder attachment is approximately at the half way point on the arms):

			F_c = force of cylinder = pi r^2 * Pressure = 12,500 lb
			Pressure = 2500 psi
			r=1.25"
			Force of 2 cylinders (25,000 lb)

			M=mass of loader=2000lb

			Torque balance around pivot:

			Down:

			2Msin(phi)=4000sin(21 deg) = 1400lb

			Up:

			2F_csin(theta) = 25,000*sin(8 deg) = 3500 lb

			The difference between up and down forces indicates a static lifting capacity of 2000 lb at full height.



	[[Category:LifeTrac Scaling Calculations]]		[[Category:LifeTrac Scaling Calculations]]

Marcin: /* Basic Analysis */

2011-12-07T02:28:41Z

Basic Analysis

← Older revision		Revision as of 02:28, 7 December 2011
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	Here is the DXF file: [[File:LTIVheight.dxf]]		Here is the DXF file: [[File:LTIVheight.dxf]]

			The red triangle models the geometry between 3 points: the cylinder to frame pin - loader to frame pivot - and loader to quick attach plate pivot.

			The green line is the extended cylinder. The height of the loader arm pivot is 64 inches above the ground. The angle of the extended cylinder from the vertical is 21 degeres. The angle theta between the cylinder and the loader is 8 degrees in the fully extended position, and 49 degrees in the retracted position. The angle phi off vertical of the extended loader arms is about 21 degrees.

			Cylinder specification - see [https://www.surpluscenter.com/item.asp?item=9-6775&catname=hydraulic] : 2.5" diameter, 2500 psi, 36" stroke.

			Force calculations indicate over 12,000 lb of lifting force at the fully retracted position, and approximately 2000 lb at full height.

			=Torque Balance Calculations=

			Downward torque at cylinder-arm attachment is (assuming all loader weight is approximately at the end of the loader arms, and assuming





	[[Category:LifeTrac Scaling Calculations]]		[[Category:LifeTrac Scaling Calculations]]

Marcin: /* Basic Analysis */

2011-12-07T02:12:44Z

Basic Analysis

← Older revision		Revision as of 02:12, 7 December 2011
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	loader geometry at height. This is the analysis:		loader geometry at height. This is the analysis:

	[[Image: lifetracIVheight.jpg]]		[[Image:lifetracIVheight.jpg]]

	Here is the DXF file: [[File:LTIVheight.dxf]]		Here is the DXF file: [[File:LTIVheight.dxf]]