13 Truing of Grinding wheel Truing is the process of removal of abrasive materials from the cutting face of the wheel and the sides of the wheel so that the wheel runs true with respect to the axis of rotation Truing is carried out with a diamond which has a shearing action on the abrasive grains and the bond and so removes irregular group of grains
9 Common Grinding Wheels A grinding wheel is made of abrasive grains held together by a bond These grains cut like teeth when the wheel is revolved at high speed and is brought to bear against a work piece The properties of a wheel that determine how it acts are the kind and size of abrasive how closely the grains are packed together and amount of the
11 Grinding Variables Chip vol Chip length external grinding Chip length internal grinding FIGURE Basic variables in surface grinding In actual grinding operations the wheel depth of cut d and contact length l are much smaller than the wheel diameter D The dimension t is called the grain depth of cut
10 Coarse 10 12 14 16 20 24 Medium 30 36 46 54 60 Fine 80 100 120 150 180 Very Fine 220 240 280 320 400 500 600 Grits The grain or grit number indicates in a general way the size of the abrasive grains used in making a wheel or the size of the cutting teeth since grinding is a true cutting operation Grain size is denoted by a number indicating
The stability of slopes in open pit mining operations and quarries is extremely important from both economic and safety points of view The stability of rock slopes entails the design of safe economical and functional excavated slopes to attain equilibrium conditions of natural slopes [] It is generally accepted that during the design of a stable slope a proper understanding of the
1 GEOTECHNICAL SLOPE STABILITY Agreed refers to a standard level or criterion which if SCOPE achieved ensures that no significant adverse environmental impact is likely to occur Such standards This guideline provides advice on the geotechnical levels or criteria may be drawn from published sources or aspects of designing for stable sloping post
23 Optimizing cutting parameters for Minimum cost R = R1 R2 R3 R4 R5 R = Total Cost/ piece R1 = Material Cost/ piece R2 = Set up and idle time Cost/ piece R3 = Machining Cost/ piece R4 = Tool changing Cost/ piece R5 = Tool regrinding Cost/ piece λ 1= Cost/ min of labour and overheads λ 2= Cost of setting a tool for regrinding λ3 = Cost/mm of
6 6 SLOPE STABILITY ANALYSIS Infinite Slope Case C Granular soil c=0 For fully saturated slope h=H 𝐹𝑂𝑆 = 1 − 𝛾 𝑤ℎ 𝛾𝐻 tan 𝜙′ tan 𝛼 𝐹𝑂𝑆 = 𝛾 − 𝛾 𝑤 𝛾 tan 𝜙′ tan 𝛼 𝐹𝑂𝑆 = tan 𝜙′ tan 𝛼 For critical case; FOS = 1 1 = tan 𝜙′ tan 𝛼 tan 𝛼 = ∙ tan 𝜙′ a fully saturated slope will be
An accurate slope failure prediction will potentially give an ample time to manage risk related with slope stability wherein the evacuation ofequipment or personal would be executed on a timely
Geotechnical Engineering Journal of the SEAGS & AGSSEA Vol 51 No 4 December 2020 ISSN 0046 5828 A Review on Rock Slope Stability Failure Mechanisms Stabilization Techniques and Implications for Mining Engineering William Ngaha Tiedeu 1 and 2 Deyi Jiang 1 Jie Chen 1 and Jinyang Fan 1 School of Resources and Environmental Sciences Chongqing University
This chart gives the guideline to determine 0 and y to ensure spinning free centerless grinding operations where po of the applied regulating wheel is known The safe operation is secured in the case where a set of 0 and y is selected from the safe operation zone up parameters n and ycrosses the chatter zone the chatter vibration occurs
The slope stability has already become one of the most important factors directly related to the safety production and development of a mine which is principally controlled by the properties of geological discontinuities of slope such as bedding planes faults cleavage and joints In this study a new approach for the evaluation of slope stability in large open pit mines
Title Portable Grinder Safety Author LewandowskiU088436 Last modified by u144682 Created Date 1/12/2006 1 40 27 PM Document presentation format A free PowerPoint PPT presentation displayed as an HTML5 slide show on id 6094ca YTY4Z
14 In class Assignment The following conditions and settings are used in a certain surface grinding operation wheel diameter = in infeed = in wheel speed = 4750 ft/min work speed = 50 ft/min and cross‑feed = in The number of active grits per square inch of wheel surface = 500 Determine a the average length per chip b the metal removal rate and c the number
Rainfall induced landslide is a complex process According to a large number of rainfall induced landslide events in Hong Kong Dai and Lee 2001 showed that there was a correlation between rainfall and landslides and pointed out that the number of landslides could be well predicted by the cumulative rainfall in the previous 12 h Based on the monitoring data of a
The key components are the grinding wheel workholding chuck and reciprocating or rotary table The wheel rotates to grind the flat surface of a workpiece held securely in the chuck Factors like material and wheel selection influence the process Precision grinding provides smooth flat surfaces for functional purposes Read less
Surface Grinding Operations a Traverse grinding with a horizontal spindle surface grinder b Plunge grinding with a horizontal spindle surface grinder producing a groove in the workpiece c A vertical spindle rotary table grinder also known as the Blanchard type 26 Surface Grinding horizontal spindle surface grinder
Review of Radar Technologies for Slope Stability in Open Pit Mines J Oosthuizen VBKOM Consulting Centurion South Africa Corresponding author e mail info Open pit mining operations are inseparable from the risk of slope failures These slope failures do not only cause extensive production downtime and damage to assets
14 In class Assignment The following conditions and settings are used in a certain surface grinding operation wheel diameter = in infeed = in wheel speed = 4750 ft/min work speed = 50 ft/min and cross‑feed = in The number of active grits per square inch of wheel surface = 500 Determine a the average length per chip b the metal removal rate and c the number
The stability of slopes in open pit mining operations and quarries is extremely important from both economic and safety points of view The stability of rock slopes entails the design of safe economical and functional excavated slopes to attain equilibrium conditions of natural slopes [] It is generally accepted that during the design of a stable slope a proper understanding of the
