Parametric Sprocket - Revision history

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2020-12-25T16:00:34Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 16:00, 25 December 2020
Line 7:		Line 7:
	[[File:trackpad.png\|200px]]		[[File:trackpad.png\|200px]]

	*Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.		*'''Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.
	*Then we generate the sprocket using 5 parameters		*Then we generate the sprocket using 5 parameters
	:*1 - Number of teeth		:*1 - Number of teeth

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2020-12-25T00:38:42Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 00:38, 25 December 2020
Line 3:		Line 3:
	*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.		*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.
	*How do we know how to scale it to match our specific case?		*How do we know how to scale it to match our specific case?
	*We first design the track. We settled on pin spacing of 3", and XXH 1.5" pipe (see [[Pipe Chart]]) for the roller, with 1" pins. Thus: roller = 1.9" OD (1.5		*We first design the track. We settled on pin spacing of 3", and XXH 1.5" pipe (see [[Pipe Chart]]) for the roller, with 1" pins. Thus: roller = 1.9" OD (1.5" XXH pipe), pitch = 3" (based on geometry of pins:
	XXH pipe), pitch = 3" (based on geometry of pins:

	[[File:trackpad.png\|200px]]		[[File:trackpad.png\|200px]]

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2020-12-25T00:38:15Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 00:38, 25 December 2020
Line 6:		Line 6:
	XXH pipe), pitch = 3" (based on geometry of pins:		XXH pipe), pitch = 3" (based on geometry of pins:

	[[File:~~trackunit~~.png\|200px]]		[[File:trackpad.png\|200px]]

	*Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.		*Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2020-12-25T00:38:00Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 00:38, 25 December 2020
Line 3:		Line 3:
	*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.		*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.
	*How do we know how to scale it to match our specific case?		*How do we know how to scale it to match our specific case?
	*We first design the track. We settled on pin spacing of 3", and XXH 1.5" pipe (see [[Pipe Chart]]) for the roller, with 1" pins. Thus: roller = 1.9", pitch = 3". Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.		*We first design the track. We settled on pin spacing of 3", and XXH 1.5" pipe (see [[Pipe Chart]]) for the roller, with 1" pins. Thus: roller = 1.9" OD (1.5
			XXH pipe), pitch = 3" (based on geometry of pins:

			[[File:trackunit.png\|200px]]

			*Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.
	*Then we generate the sprocket using 5 parameters		*Then we generate the sprocket using 5 parameters
	:*1 - Number of teeth		:*1 - Number of teeth

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2020-12-25T00:32:37Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 00:32, 25 December 2020
Line 4:		Line 4:
	*How do we know how to scale it to match our specific case?		*How do we know how to scale it to match our specific case?
	*We first design the track. We settled on pin spacing of 3", and XXH 1.5" pipe (see [[Pipe Chart]]) for the roller, with 1" pins. Thus: roller = 1.9", pitch = 3". Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.		*We first design the track. We settled on pin spacing of 3", and XXH 1.5" pipe (see [[Pipe Chart]]) for the roller, with 1" pins. Thus: roller = 1.9", pitch = 3". Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.
	*Then we generate the sprocket:		*Then we generate the sprocket using 5 parameters
	:*Number of teeth		:*1 - Number of teeth
	:*Roller (5 units)		:*2 - Roller (5 units)
	:*Pitch - 1.58x the roller size as determined by our track geometry (looks sensible, and 3" pitch was selected as a convenient distance, and 1.9" OD roller was selected as a readily-available stock material		:*3 - Pitch - 1.58x the roller size as determined by our track geometry (looks sensible, and 3" pitch was selected as a convenient distance, and 1.9" OD roller was selected as a readily-available stock material
	:*Thickness - that is the thickness of the plate material		:*4 - Thickness - that is the thickness of the plate material
	:*Tolerance - play in the distance between rollers (pitch)?		:*5 - Tolerance - play in the distance between rollers (pitch)?
	*To generate a correct sprocket, we can scale the resulting design in CAD - by superposing the track piece over the sprocket to make sure the track pieces fit in the valley-to-valley distance in the sprocket (which corresponds to the distance between rollers, or pitch)		*To generate a correct sprocket, we can scale the resulting design in CAD - by superposing the track piece over the sprocket to make sure the track pieces fit in the valley-to-valley distance in the sprocket (which corresponds to the distance between rollers, or pitch)
	:*See the [[File:Sprocketgeo.dxf]] for how the track pieces fit into the sprocket (example shows a larger sprocket than an 8 tooth sprocket)		:*See the [[File:Sprocketgeo.dxf]] for how the track pieces fit into the sprocket (example shows a larger sprocket than an 8 tooth sprocket)

Marcin at 23:07, 18 November 2017

2017-11-18T23:07:04Z

← Older revision		Revision as of 23:07, 18 November 2017
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	*~~http://www.thingiverse.com/thing~~:~~87647/#files - has a good 15 tooth example - Bike Sprocket~~		*Source: '''http://www.thingiverse.com/thing:7918'''
	*The above was derived from http://www.thingiverse.com/thing:7918
	=How to Design a Sprocket for Bulldozer Drive=		=How to Design a Sprocket for Bulldozer Drive=
	*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.		*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2017-10-20T06:00:47Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 06:00, 20 October 2017
Line 12:		Line 12:
	:*Tolerance - play in the distance between rollers (pitch)?		:*Tolerance - play in the distance between rollers (pitch)?
	*To generate a correct sprocket, we can scale the resulting design in CAD - by superposing the track piece over the sprocket to make sure the track pieces fit in the valley-to-valley distance in the sprocket (which corresponds to the distance between rollers, or pitch)		*To generate a correct sprocket, we can scale the resulting design in CAD - by superposing the track piece over the sprocket to make sure the track pieces fit in the valley-to-valley distance in the sprocket (which corresponds to the distance between rollers, or pitch)
	:*See the		:*See the [[File:Sprocketgeo.dxf]] for how the track pieces fit into the sprocket (example shows a larger sprocket than an 8 tooth sprocket)

	=Bulldozer 2015 Usage=		=Bulldozer 2015 Usage=

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2017-10-20T05:59:46Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 05:59, 20 October 2017
Line 11:		Line 11:
	:*Thickness - that is the thickness of the plate material		:*Thickness - that is the thickness of the plate material
	:*Tolerance - play in the distance between rollers (pitch)?		:*Tolerance - play in the distance between rollers (pitch)?
			*To generate a correct sprocket, we can scale the resulting design in CAD - by superposing the track piece over the sprocket to make sure the track pieces fit in the valley-to-valley distance in the sprocket (which corresponds to the distance between rollers, or pitch)
			:*See the

	=Bulldozer 2015 Usage=		=Bulldozer 2015 Usage=

Marcin: /* How to Design a Sprocket for Bulldozer Drive */

2017-10-20T05:56:17Z

How to Design a Sprocket for Bulldozer Drive

← Older revision		Revision as of 05:56, 20 October 2017
Line 4:		Line 4:
	*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.		*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.
	*How do we know how to scale it to match our specific case?		*How do we know how to scale it to match our specific case?
	*We ~~note that~~ the pin spacing ~~on our track is~~ 3"		*We first design the track. We settled on pin spacing of 3", and XXH 1.5" pipe (see [[Pipe Chart]]) for the roller, with 1" pins. Thus: roller = 1.9", pitch = 3". Ratio of 3/1.9=1.58. Ratio of pitch to the roller is constant.
	*We note that the roller OD is 2.2"		*Then we generate the sprocket:
	*~~The parameters~~ we ~~have control~~ of ~~are~~:		:*Number of teeth
	:*the ~~number~~ of ~~teeth,~~		:*Roller (5 units)
	:*~~spacing~~ between ~~the~~ rollers		:*Pitch - 1.58x the roller size as determined by our track geometry (looks sensible, and 3" pitch was selected as a convenient distance, and 1.9" OD roller was selected as a readily-available stock material
			:*Thickness - that is the thickness of the plate material
			:*Tolerance - play in the distance between rollers (pitch)?

	=Bulldozer 2015 Usage=		=Bulldozer 2015 Usage=
	{{Hint\|The bulldozer from 2015 used an 8 tooth sprocket, generated with sprocket(8,5,7.5,2,0.2); in the last line of the Editor}}		{{Hint\|The bulldozer from 2015 used an 8 tooth sprocket, generated with sprocket(8,5,7.5,2,0.2); in the last line of the Editor}}

Marcin at 05:28, 20 October 2017

2017-10-20T05:28:57Z

← Older revision		Revision as of 05:28, 20 October 2017
Line 1:		Line 1:
	*http://www.thingiverse.com/thing:87647/#files - has a good 15 tooth example - Bike Sprocket		*http://www.thingiverse.com/thing:87647/#files - has a good 15 tooth example - Bike Sprocket
	*The above was derived from http://www.thingiverse.com/thing:7918		*The above was derived from http://www.thingiverse.com/thing:7918
			=How to Design a Sprocket for Bulldozer Drive=
			*The sprocket generator in OpenSCAD creates a proportionally correct sprocket.
			*How do we know how to scale it to match our specific case?
			*We note that the pin spacing on our track is 3"
			*We note that the roller OD is 2.2"
			*The parameters we have control of are:
			:*the number of teeth,
			:*spacing between the rollers
	=Bulldozer 2015 Usage=		=Bulldozer 2015 Usage=
	{{Hint\|The bulldozer from 2015 used an 8 tooth sprocket, generated with sprocket(8,5,7.5,2,0.2); in the last line of the Editor}}		{{Hint\|The bulldozer from 2015 used an 8 tooth sprocket, generated with sprocket(8,5,7.5,2,0.2); in the last line of the Editor}}
Line 13:		Line 20:
	:*Note: original srocket was generated using [[Parametric Sprocket Generator]] using sprocket(12,5,7.5,8,0.2);		:*Note: original srocket was generated using [[Parametric Sprocket Generator]] using sprocket(12,5,7.5,8,0.2);

			=Links=
			*Sprocket geometry for a correct sprocket pitch and roller diameter - example - [[File:sprocketgeo.dxf]]
			:*Uses [[Sprocket Generator]]

	[[Image:dxfexportex.jpg\|400px]]		[[Image:dxfexportex.jpg\|400px]]