Modelling Wheels - Revision history

DT Online at 09:58, 5 February 2017

2017-02-05T09:58:33Z

← Older revision		Revision as of 09:58, 5 February 2017
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	If there is access to some workshop equipment, they can be cut out from '''[[Manufactured Board]]''' or [~~https~~://en.wikipedia.org/wiki/Softwood '''Softwood'''] for example. They can also be cut out by hand using a '''[[Coping Saw]]''' and finished to shape with a '''[[Bench Sanders\|Bench Sander]]''', if available - or even 'turned' on a '''[[Centre Lathe\|Lathe]]'''!		If there is access to some workshop equipment, they can be cut out from '''[[Manufactured Board]]''' or [http://en.wikipedia.org/wiki/Softwood '''Softwood'''] for example. They can also be cut out by hand using a '''[[Coping Saw]]''' and finished to shape with a '''[[Bench Sanders\|Bench Sander]]''', if available - or even 'turned' on a '''[[Centre Lathe\|Lathe]]'''!


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	----		----
	<span style="color: green">'''Note:'''The thin edge of a card disc results in very little [~~https~~://en.wikipedia.org/wiki/Rolling_resistance\| '''Rolling Friction'''] whereas doubling up MDF discs can make wider wheels which have more [~~https~~://en.wikipedia.org/wiki/Traction_%28engineering%29'''Traction''']. Which would be best for a balloon powered vehicle and which for those driven through the wheels by an electric motor for example?		<span style="color: green">'''Note:'''The thin edge of a card disc results in very little [http://en.wikipedia.org/wiki/Rolling_resistance\| '''Rolling Friction'''] whereas doubling up MDF discs can make wider wheels which have more [http://en.wikipedia.org/wiki/Traction_%28engineering%29'''Traction''']. Which would be best for a balloon powered vehicle and which for those driven through the wheels by an electric motor for example?
	</span>		</span>
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	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''
	Such large diameter wheels may take more effort to get them the moving but once started are likely to free-wheel for longer. Can you think why this should be so? ''(think about the CD radius being a '''[[:Category:Levers\|Lever]]''' and its point of contact with the ground as the '''Fulcrum'''. You may also want to learn about [~~https~~://en.wikipedia.org/wiki/Inertia '''Inertia'''] and [~~https~~://en.wikipedia.org/wiki/Momentum '''Momentum'''])''.		Such large diameter wheels may take more effort to get them the moving but once started are likely to free-wheel for longer. Can you think why this should be so? ''(think about the CD radius being a '''[[:Category:Levers\|Lever]]''' and its point of contact with the ground as the '''Fulcrum'''. You may also want to learn about [http://en.wikipedia.org/wiki/Inertia '''Inertia'''] and [http://en.wikipedia.org/wiki/Momentum '''Momentum'''])''.
	</span>		</span>
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	Such wide wheels can be seen as a combined wheel and pulley and may easier to locate the drive belt from an electric motor around. They are also useful if modelling a [~~https~~://en.wikipedia.org/wiki/Conveyor_belt '''Conveyor Belt'''] or the feed rollers used in automatic factories and at some supermarket checkouts for example.		Such wide wheels can be seen as a combined wheel and pulley and may easier to locate the drive belt from an electric motor around. They are also useful if modelling a [http://en.wikipedia.org/wiki/Conveyor_belt '''Conveyor Belt'''] or the feed rollers used in automatic factories and at some supermarket checkouts for example.
	\| [[File:DrinksCan.png\|300px\|right]]		\| [[File:DrinksCan.png\|300px\|right]]
	\|-		\|-
	\| '''Screwtop Jar Lids'''		\| '''Screwtop Jar Lids'''
	\| Typically found as coffee jar lids, these have a deep and serrated rim which can provide good grip ''(or [~~https~~://en.wikipedia.org/wiki/Traction_%28engineering%29'''Traction'''])'' if needed.		\| Typically found as coffee jar lids, these have a deep and serrated rim which can provide good grip ''(or [http://en.wikipedia.org/wiki/Traction_%28engineering%29'''Traction'''])'' if needed.


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	\|-		\|-
	\| '''Adding a Tyre'''		\| '''Adding a Tyre'''
	\| Bicycle [~~https~~://en.wikipedia.org/wiki/Tire#Associated_components '''Inner Tubes'''] can be used to model tyres - and actually provide extra grip. Choose a tube diameter a little less than the finished wheel size and cut into pieces about 2 or 3 times the wheel thickness long.		\| Bicycle [http://en.wikipedia.org/wiki/Tire#Associated_components '''Inner Tubes'''] can be used to model tyres - and actually provide extra grip. Choose a tube diameter a little less than the finished wheel size and cut into pieces about 2 or 3 times the wheel thickness long.

DT Online: Added Template

2016-06-06T18:23:55Z

Added Template

← Older revision		Revision as of 18:23, 6 June 2016
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			=====Description=====
	Wheels for working models are available commercially, often in wood or plastics or as found in '''[[Construction Kits]]''', but they can readily be made from pre-cut discs of '''[[Paper and Card\|Card]]''', '''[[Manufactured Board\|Ply or MDF]]'''. Alternatively, 'found objects' such as '''[[Stripwood Technology Materials\|Cotton Reels]]''' and '''CDs''' can be used.		Wheels for working models are available commercially, often in wood or plastics or as found in '''[[Construction Kits]]''', but they can readily be made from pre-cut discs of '''[[Paper and Card\|Card]]''', '''[[Manufactured Board\|Ply or MDF]]'''. Alternatively, 'found objects' such as '''[[Stripwood Technology Materials\|Cotton Reels]]''' and '''CDs''' can be used.

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	\| [[File:CopingSawUse.png\|300px\|right]]		\| [[File:CopingSawUse.png\|300px\|right]]
	\|}		\|}


			{{Stripwood Materials Buyers Guide (1)}}


	[[Category:Primary Technology]]		[[Category:Primary Technology]]
	[[Category:Stripwood Technology]]		[[Category:Stripwood Technology]]

DT Online: DT Online moved page Making Wheels to Modelling Wheels without leaving a redirect: Author request

2016-04-15T08:01:27Z

DT Online moved page Making Wheels to Modelling Wheels without leaving a redirect: Author request

← Older revision	Revision as of 08:01, 15 April 2016
(No difference)

DT Online at 14:42, 10 April 2016

2016-04-10T14:42:13Z

← Older revision		Revision as of 14:42, 10 April 2016
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	\|-		\|-
	\| '''Adding a Tyre'''		\| '''Adding a Tyre'''
	\| Bicycle [https://en.wikipedia.org/wiki/Tire#Associated_components '''Inner Tubes'''] can be used to model tyres - and actually provide extra grip. Choose a tube diameter a little less than the finished wheel size and cut into pieces about 3 times the wheel thickness long.		\| Bicycle [https://en.wikipedia.org/wiki/Tire#Associated_components '''Inner Tubes'''] can be used to model tyres - and actually provide extra grip. Choose a tube diameter a little less than the finished wheel size and cut into pieces about 2 or 3 times the wheel thickness long.

DT Online: Created article

2016-04-10T11:25:58Z

Created article

New page

Wheels for working models are available commercially, often in wood or plastics or as found in '''[[Construction Kits]]''', but they can readily be made from pre-cut discs of '''[[Paper and Card|Card]]''', '''[[Manufactured Board|Ply or MDF]]'''. Alternatively, 'found objects' such as '''[[Stripwood Technology Materials|Cotton Reels]]''' and '''CDs''' can be used.

If there is access to some workshop equipment, they can be cut out from '''[[Manufactured Board]]''' or [https://en.wikipedia.org/wiki/Softwood '''Softwood'''] for example. They can also be cut out by hand using a '''[[Coping Saw]]''' and finished to shape with a '''[[Bench Sanders|Bench Sander]]''', if available - or even 'turned' on a '''[[Centre Lathe|Lathe]]'''!

__TOC__

=====Using Pre-cut Materials=====

{|
|-
| '''Card and MDF Discs'''
| Pre-cut discs of '''[[Paper and Card|Card]]''', '''[[Manufactured Board|Ply or MDF]]''' can be purchased and either used separately or glued together with '''[[Glues and Pastes|PVA]]''' to make wheels in a range of diameters and widths.

----
'''Note:'''The thin edge of a card disc results in very little [https://en.wikipedia.org/wiki/Rolling_resistance| '''Rolling Friction'''] whereas doubling up MDF discs can make wider wheels which have more [https://en.wikipedia.org/wiki/Traction_%28engineering%29'''Traction''']. Which would be best for a balloon powered vehicle and which for those driven through the wheels by an electric motor for example?

----
| [[File:CardMDFdiscs.png|300px|right]]
|}

=====Found Objects=====

{|
|-
| '''CDs and Cotton Reels'''
| '''CDs''' can be used but first need to have the large centre hole reduced to accept a '''[[Stripwood Technology Materials|Dowel Axle]]'''. Plastics centres are commercially available but a small diameter MDF disc can be used to solve the problem. Alternatively, a cotton reel can be used as shown.
----
'''Note:'''
Such large diameter wheels may take more effort to get them the moving but once started are likely to free-wheel for longer. Can you think why this should be so? ''(think about the CD radius being a '''[[:Category:Levers|Lever]]''' and its point of contact with the ground as the '''Fulcrum'''. You may also want to learn about [https://en.wikipedia.org/wiki/Inertia '''Inertia'''] and [https://en.wikipedia.org/wiki/Momentum '''Momentum'''])''.

----
| [[File:UsingCDs.png|300px|right]]
|-
| '''Soft Drinks Can'''
| Empty soft drinks cans may be used to make roller-type wheels and '''[[Making Pulleys|Pulleys]]'''. Provision to locate the '''[[Stripwood Technology Materials|Dowel Axle]]''' needs to made in a similar way as for '''CDs'''.

Such wide wheels can be seen as a combined wheel and pulley and may easier to locate the drive belt from an electric motor around. They are also useful if modelling a [https://en.wikipedia.org/wiki/Conveyor_belt '''Conveyor Belt'''] or the feed rollers used in automatic factories and at some supermarket checkouts for example.
| [[File:DrinksCan.png|300px|right]]
|-
| '''Screwtop Jar Lids'''
| Typically found as coffee jar lids, these have a deep and serrated rim which can provide good grip ''(or [https://en.wikipedia.org/wiki/Traction_%28engineering%29'''Traction'''])'' if needed.

A small MDF or Ply disc glued in the centre will provide a better location for the axle than the thin plastics of the lid.
| [[File: ScrewTopLidPulleys.png |200px|right]]
|-
| colspan=3|
----
'''Note:'''
If CDs, cotton reels, plastics lids or drinks cans are used, card or MDF discs would have to be glued to them using '''[[Adhesive Tapes|Double-Sided Tape]]''', an '''[[Adhesive Types|Adhesive]]''' such as epoxy resin or '''[[Adhesive Types|Glue Gun]]''' since '''[[Glues and Pastes|PVA]]''' would be ineffective.

----
|}

=====Cutting Out Circles=====

{|
|-
| '''Using a Holesaw'''
| If there is access to some basic workshop equipment ''(e.g. a '''[[Drill Press|Drilling Machine]]''' in a neighbouring secondary school)'' wheels can be cut from a varety of materials using a '''[[Hole Saw]]'''. Alternatively, older students or adults could use this in a '''[[Portable Electric Drills|Power Drill]]''' providing the workpiece is securely clamped to the workbench.

Whichever machine is chosen, it is easiest start with a strip of material just a little wider than the finished diameter. This allows the sawdust to clear quickly from the sides. Drill from one side until almost all the way through and then turn the strip around to complete. This minimises any chipping as the saw breaks through, and the cut disc is easier to release.
| [[File:UsingHoleSaw.png|300px|right]]
|-
| '''Adding a Tyre'''
| Bicycle [https://en.wikipedia.org/wiki/Tire#Associated_components '''Inner Tubes'''] can be used to model tyres - and actually provide extra grip. Choose a tube diameter a little less than the finished wheel size and cut into pieces about 3 times the wheel thickness long.

With a little effort, these can be stretched over the wheel disc and they will snap into place around the side of the wheel to simulate tyres.
| [[File:InnerTubeTyre2.png|300px|right]]
|-
| '''Using a Coping Saw'''
| These have a replaceable fine tooth blade which can be adjusted to different angles using pegs and tensioned by tightening the handle.

They are most easily used by gripping the handle with both hands and holding the work as shown. If used as shown the blade should face forwards and the work can be rotated as the cut is made around the drawn circle.
| [[File:CopingSawUse.png|300px|right]]
|}

[[Category:Primary Technology]]
[[Category:Stripwood Technology]]