Precision Marking and Measuring - Revision history

DT Online at 08:40, 25 November 2016

2016-11-25T08:40:48Z

← Older revision		Revision as of 08:40, 25 November 2016
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	\| '''Scribing Block'''		\| '''Scribing Block'''
	\| A device for holding a '''[[~~Pens, Pencils and Scribers\|~~Scriber]]''' to mark lines at a given height for the '''''datum surface'''''		\| A device for holding a '''[[Scriber]]''' to mark lines at a given height for the '''''datum surface'''''
	\| [[File:ScribingBlock.png\|100px\|right]]		\| [[File:ScribingBlock.png\|100px\|right]]
	\|-		\|-

DT Online at 15:52, 11 September 2016

2016-09-11T15:52:38Z

← Older revision		Revision as of 15:52, 11 September 2016
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	\| [https://en.wikipedia.org/wiki/Surface_plate '''Surface Plate''']		\| [https://en.wikipedia.org/wiki/Surface_plate '''Surface Plate''']
	\| An accurately machined flat surface usually made from '''Cast Iron''' for stability ''(larger versions may be called a '''Surface Table''')''. Work may be placed on here and heights measured from the surface for example.		\| An accurately machined flat surface usually made from '''Cast Iron''' for stability ''(larger versions may be called a '''Surface Table''')''. Work may be placed on here and heights measured from the surface for example.
			----
			<span style="color: green">'''Note:'''
			For most applications in '''[[Design and Technology]]''' a piece of [https://en.wikipedia.org/wiki/Float_glass '''Float Glass'''], as used in good quality mirrors for example, would provide an adequately flat reference surface.
			</span>
			----
	\| [[File:SurfacePlate.png\|250px\|right]]		\| [[File:SurfacePlate.png\|250px\|right]]
	\|-		\|-

DT Online: Added Product

2016-09-09T20:48:49Z

Added Product

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 | Used to check that a component is parallel to the '''Surface Plate''' or flat or to check a bar is round by rotating it on '''Vee Blocks''' whilst a '''DTI''' is held against it.
 | [[File:DialGauge.png|200px|right]]
 |}

DT Online: Added Template

2016-09-09T19:18:30Z

Added Template

← Older revision		Revision as of 19:18, 9 September 2016
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	[[File:UsingSurfacePlate.png \|~~400px~~\|right]]		[[File:UsingSurfacePlate.png \|300px\|right]]
	When components have to be made to a precise measurement, in [https://en.wikipedia.org/wiki/Engineering '''Engineering'''] for example, it is important to be able to mark them out and test their dimensions as accurately as possible. A sharp '''[[Pens, Pencils and Scribers\|Scriber]]''' is used to mark lines and the surface of [https://en.wikipedia.org/wiki/Carbon_steel '''bright drawn mild steel (BDMS)'''] may first be coated with [https://en.wikipedia.org/wiki/Marking_blue '''Marking Blue'''] to ensure the lines can be seen easily ''([https://en.wikipedia.org/wiki/Rolling_%28metalworking%29 '''black rolled mild steel'''] or [https://en.wikipedia.org/wiki/Cast_iron '''cast iron'''] could be rubbed with chalk for similar reasons)''.		__TOC__


			=====Description=====

			When components have to be made to a precise measurement, in [https://en.wikipedia.org/wiki/Engineering '''Engineering'''] for example, it is important to be able to mark them out and test their dimensions as accurately as possible. A sharp '''[[Scriber]]''' is used to mark lines and the surface of [https://en.wikipedia.org/wiki/Carbon_steel '''bright drawn mild steel (BDMS)'''] may first be coated with [https://en.wikipedia.org/wiki/Marking_blue '''Marking Blue'''] to ensure the lines can be seen easily ''([https://en.wikipedia.org/wiki/Rolling_%28metalworking%29 '''black rolled mild steel'''] or [https://en.wikipedia.org/wiki/Cast_iron '''cast iron'''] could be rubbed with chalk for similar reasons)''.


			=====Features and Applications=====

	Engineering components can be irregular in shape and so a line or surface has to be chosen as the [https://en.wikipedia.org/wiki/Datum_reference '''Datum'''] - i.e. the place from where all measurements will start . The datum can be a centre line or a straight edge ''(in woodwork, this would be the '''[[Face Side and Face Edge\|Face Side]]''' or '''[[Face Side and Face Edge\|Face Edge]]''')''. Often, and especially with castings or mouldings, the workpiece is held in relation to a flat surface to enable these reference lines to be scribed in the first place. Testing of properties such as flatness, roundness or parallelness can also be achieved by checking against a known flat surface.		Engineering components can be irregular in shape and so a line or surface has to be chosen as the [https://en.wikipedia.org/wiki/Datum_reference '''Datum'''] - i.e. the place from where all measurements will start . The datum can be a centre line or a straight edge ''(in woodwork, this would be the '''[[Face Side and Face Edge\|Face Side]]''' or '''[[Face Side and Face Edge\|Face Edge]]''')''. Often, and especially with castings or mouldings, the workpiece is held in relation to a flat surface to enable these reference lines to be scribed in the first place. Testing of properties such as flatness, roundness or parallelness can also be achieved by checking against a known flat surface.
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	\| [[File:DialGauge.png\|200px\|right]]		\| [[File:DialGauge.png\|200px\|right]]
	\|}		\|}

			{{Precision Marking Buyers Guide}}


	[[Category:Secondary]]		[[Category:Secondary]]
	[[Category:Marking and Measuring Tools]]		[[Category:Marking and Measuring Tools]]

DT Online: Corrected link

2015-10-28T13:38:12Z

Corrected link

← Older revision		Revision as of 13:38, 28 October 2015
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	[[File:UsingSurfacePlate.png \|400px\|right]]		[[File:UsingSurfacePlate.png \|400px\|right]]
	When components have to be made to a precise measurement, in [https://en.wikipedia.org/wiki/Engineering '''Engineering'''] for example, it is important to be able to mark them out and test their dimensions as accurately as possible. A sharp ~~[https://en.wikipedia.org/wiki/Scriber~~ '''Scriber'''] is used to mark lines and the surface of [https://en.wikipedia.org/wiki/Carbon_steel '''bright drawn mild steel (BDMS)'''] may first be coated with [https://en.wikipedia.org/wiki/Marking_blue '''Marking Blue'''] to ensure the lines can be seen easily ''([https://en.wikipedia.org/wiki/Rolling_%28metalworking%29 '''black rolled mild steel'''] or [https://en.wikipedia.org/wiki/Cast_iron '''cast iron'''] could be rubbed with chalk for similar reasons)''.		When components have to be made to a precise measurement, in [https://en.wikipedia.org/wiki/Engineering '''Engineering'''] for example, it is important to be able to mark them out and test their dimensions as accurately as possible. A sharp '''[[Pens, Pencils and Scribers\|Scriber]]''' is used to mark lines and the surface of [https://en.wikipedia.org/wiki/Carbon_steel '''bright drawn mild steel (BDMS)'''] may first be coated with [https://en.wikipedia.org/wiki/Marking_blue '''Marking Blue'''] to ensure the lines can be seen easily ''([https://en.wikipedia.org/wiki/Rolling_%28metalworking%29 '''black rolled mild steel'''] or [https://en.wikipedia.org/wiki/Cast_iron '''cast iron'''] could be rubbed with chalk for similar reasons)''.


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	\|-		\|-
	\| '''Scribing Block'''		\| '''Scribing Block'''
	\| A device for holding a '''Scriber''' to mark lines at a given height for the '''''datum surface'''''		\| A device for holding a '''[[Pens, Pencils and Scribers\|Scriber]]''' to mark lines at a given height for the '''''datum surface'''''
	\| [[File:ScribingBlock.png\|100px\|right]]		\| [[File:ScribingBlock.png\|100px\|right]]
	\|-		\|-

DT Online: Added links

2015-07-22T12:39:34Z

Added links

← Older revision		Revision as of 12:39, 22 July 2015
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	[[File:UsingSurfacePlate.png \|400px\|right]]		[[File:UsingSurfacePlate.png \|400px\|right]]
	When components have to be made to a precise measurement, in [https://en.wikipedia.org/wiki/Engineering '''Engineering'''] for example, it is important to be able to mark them out and test their dimensions as accurately as possible. A sharp [https://en.wikipedia.org/wiki/Scriber '''Scriber'''] is used to mark lines and the surface of '''bright mild steel''' may first be coated with [https://en.wikipedia.org/wiki/Marking_blue '''Marking Blue'''] to ensure the lines can be seen easily ''('''black mild steel''' or [https://en.wikipedia.org/wiki/~~Marking_blue~~ '''cast iron'''] could be rubbed with chalk for similar reasons)''.		When components have to be made to a precise measurement, in [https://en.wikipedia.org/wiki/Engineering '''Engineering'''] for example, it is important to be able to mark them out and test their dimensions as accurately as possible. A sharp [https://en.wikipedia.org/wiki/Scriber '''Scriber'''] is used to mark lines and the surface of [https://en.wikipedia.org/wiki/Carbon_steel '''bright drawn mild steel (BDMS)'''] may first be coated with [https://en.wikipedia.org/wiki/Marking_blue '''Marking Blue'''] to ensure the lines can be seen easily ''([https://en.wikipedia.org/wiki/Rolling_%28metalworking%29 '''black rolled mild steel'''] or [https://en.wikipedia.org/wiki/Cast_iron '''cast iron'''] could be rubbed with chalk for similar reasons)''.


	Engineering components can be irregular in shape and so a line or surface has to be chosen as the [https://en.wikipedia.org/wiki/Datum_reference '''Datum'''] - i.e. the place from where all measurements will start . The ~~'''Datum'''~~ can be a ~~'''Centre Line'''~~ or a straight edge ''(in woodwork, this would be the '''Face Side''' or '''Face Edge''')''. Often, and especially with castings or mouldings, the workpiece is held in relation to a flat surface to enable these reference lines to be scribed in the first place. Testing of properties such as flatness, roundness or parallelness can also be achieved by checking against a known flat surface.		Engineering components can be irregular in shape and so a line or surface has to be chosen as the [https://en.wikipedia.org/wiki/Datum_reference '''Datum'''] - i.e. the place from where all measurements will start . The datum can be a centre line or a straight edge ''(in woodwork, this would be the '''[[Face Side and Face Edge\|Face Side]]''' or '''[[Face Side and Face Edge\|Face Edge]]''')''. Often, and especially with castings or mouldings, the workpiece is held in relation to a flat surface to enable these reference lines to be scribed in the first place. Testing of properties such as flatness, roundness or parallelness can also be achieved by checking against a known flat surface.
	----		----
	<span style="color: green">'''Note:'''		<span style="color: green">'''Note:'''

DT Online: Added category link

2015-07-22T12:22:27Z

Added category link

← Older revision		Revision as of 12:22, 22 July 2015
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	\| [[File:DialGauge.png\|200px\|right]]		\| [[File:DialGauge.png\|200px\|right]]
	\|}		\|}


			[[Category:Secondary]]
			[[Category:Marking and Measuring Tools]]

DT Online: Created Article

2015-07-22T09:09:24Z

Created Article

New page

[[File:UsingSurfacePlate.png |400px|right]]
When components have to be made to a precise measurement, in [https://en.wikipedia.org/wiki/Engineering '''Engineering'''] for example, it is important to be able to mark them out and test their dimensions as accurately as possible. A sharp [https://en.wikipedia.org/wiki/Scriber '''Scriber'''] is used to mark lines and the surface of '''bright mild steel''' may first be coated with [https://en.wikipedia.org/wiki/Marking_blue '''Marking Blue'''] to ensure the lines can be seen easily ''('''black mild steel''' or [https://en.wikipedia.org/wiki/Marking_blue '''cast iron'''] could be rubbed with chalk for similar reasons)''.

Engineering components can be irregular in shape and so a line or surface has to be chosen as the [https://en.wikipedia.org/wiki/Datum_reference '''Datum'''] - i.e. the place from where all measurements will start . The '''Datum''' can be a '''Centre Line''' or a straight edge ''(in woodwork, this would be the '''Face Side''' or '''Face Edge''')''. Often, and especially with castings or mouldings, the workpiece is held in relation to a flat surface to enable these reference lines to be scribed in the first place. Testing of properties such as flatness, roundness or parallelness can also be achieved by checking against a known flat surface.
----
<span style="color: green">'''Note:'''
It is virtually impossible to make anything to an exact size. In practice components are made as accurately as they need to be to function. The degree of error allowable is known as the [https://en.wikipedia.org/wiki/Engineering_tolerance '''Tolerance'''] and this varies with the type of work being done ''(e.g. the working parts of a car engine demand much closer '''tolerances''' than the garage to put the car in)''
</span>
----
{|
|-
| [https://en.wikipedia.org/wiki/Surface_plate '''Surface Plate''']
| An accurately machined flat surface usually made from '''Cast Iron''' for stability ''(larger versions may be called a '''Surface Table''')''. Work may be placed on here and heights measured from the surface for example.
| [[File:SurfacePlate.png|250px|right]]
|-
| '''Scribing Block'''
| A device for holding a '''Scriber''' to mark lines at a given height for the '''''datum surface'''''
| [[File:ScribingBlock.png|100px|right]]
|-
| [https://en.wikipedia.org/wiki/Height_gauge '''Surface Gauge''']
| Similar to a '''Scribing Block''' but with the addition of a fine adjustment screw and sometimes a direct measurement read-out ''(then known as a '''Height Gauge''')''
| [[File:SurfaceGauge.png|100px|right]]
|-
| [http://www.example.com '''Vee Blocks and Clamp''']
| Used to hold round bar in position on the '''Surface Plate''' to enable it to be marked on.
----
<span style="color: green">'''Note:'''
When longer bars need to be supported on two '''Vee Blocks''' only a single '''Clamp''' is used to ensure they stay flat on the '''Surface Plate''' and don't rock.
</span>
----
| [[File:VeeBlocksandClamp.png|200px|right]]
|-
| [https://en.wikipedia.org/wiki/Angle_plate '''Angle Plate''']
| Used to fix work at right-angles to a '''Surface Plate''' or at an angle to it ''(also used to bolt work to for machining operations)''
| [[File:AnglePlate.png|200px|right]]
|-
| [https://en.wikipedia.org/wiki/Indicator_%28distance_amplifying_instrument%29 '''Dial Test Indicator (DTI)''']
| Used to check that a component is parallel to the '''Surface Plate''' or flat or to check a bar is round by rotating it on '''Vee Blocks''' whilst a '''DTI''' is held against it.
| [[File:DialGauge.png|200px|right]]
|}