718
edits
Changes
Jump to navigation
Jump to search
mLine 66:
Line 66: + + − − [[File:Surface-grinder-wheel-inspection.jpg]] Line 125:
Line 125: + + − − [[File:Surface-grinding-wheel-markings.jpg]] − + Line 284:
Line 284: − + Line 353:
Line 353: −
Boyer Schultz 6-12 Surface Grinder (view source)
Revision as of 17:09, 11 August 2018
, 17:09, 11 August 2018→Auth/Use Notes: image thumbnails
==== Wheel Inspection ====
==== Wheel Inspection ====
[[File:Surface-grinder-wheel-inspection.jpg|thumb|right|Tap a wheel with the end of a screwdriver to test its ring]]
<blockquote>When a grinding wheel is received in the shop or removed from storage, it should be inspected closely for damage or cracks. Check a small wheel by suspending it on one finger or with a piece of string. Tap it gently with a light nonmetallic instrument, such as the handle of a screwdriver.
<blockquote>When a grinding wheel is received in the shop or removed from storage, it should be inspected closely for damage or cracks. Check a small wheel by suspending it on one finger or with a piece of string. Tap it gently with a light nonmetallic instrument, such as the handle of a screwdriver.
If the wheel does not give a clear ring, discard it. All wheels do not emit the same tone; a low tone does not necessarily mean a cracked wheel. Wheels are often filled with various resins or greases to modify their cutting action, and resin or grease deadens the tone. Vitrified and silicate wheels emit a clear metallic ring. Resin, rubber, and shellac bonded wheels emit a tone that is less clear. Regardless of the bond, the sound of a cracked wheel is easy to identify.</blockquote>
If the wheel does not give a clear ring, discard it. All wheels do not emit the same tone; a low tone does not necessarily mean a cracked wheel. Wheels are often filled with various resins or greases to modify their cutting action, and resin or grease deadens the tone. Vitrified and silicate wheels emit a clear metallic ring. Resin, rubber, and shellac bonded wheels emit a tone that is less clear. Regardless of the bond, the sound of a cracked wheel is easy to identify.</blockquote>
==== Operation ====
==== Operation ====
==== Wheel Types ====
==== Wheel Types ====
[[File:Surface-grinding-wheel-markings.jpg|thumb|right|Wheel type markings]]
<blockquote>Every grinding wheel is marked by the manufacturer with a stencil or a small tag. The manufacturers have worked out a standard system of markings.</blockquote>
<blockquote>Every grinding wheel is marked by the manufacturer with a stencil or a small tag. The manufacturers have worked out a standard system of markings.</blockquote>
==== Wheel Shape ====
==== Wheel Shape ====
[[File:Surface-grinder-heel-shapes.jpg]]
[[File:Surface-grinder-heel-shapes.jpg|thumb|right|Wheel shapes]]
{|class="wikitable"
{|class="wikitable"
==== Abrasive structure ====
==== Abrasive structure ====
[[File:Surface-grinding-wheel-structure.jpg]]
[[File:Surface-grinding-wheel-structure.jpg|thumb|right|Wheel structure]]
<blockquote>Bond strength of a grinding wheel is not wholly dependent upon the grade of hardness but depends equally on the structure of the wheel, that is, the spacing of the grain or its density. The structure or spacing is measured in number of grains per cubic inch of wheel volume.
<blockquote>Bond strength of a grinding wheel is not wholly dependent upon the grade of hardness but depends equally on the structure of the wheel, that is, the spacing of the grain or its density. The structure or spacing is measured in number of grains per cubic inch of wheel volume.
| Very friable use for carbide grinding applications.
| Very friable use for carbide grinding applications.
|}
|}
== To-Do ==
== To-Do ==