STUDY OF MATERIAL REMOVAL RATE OF DIFFERENT TOOL MATERIALS DURING EDM OF H 11 STEEL AT REVERSE POLARITY
Electric Discharge Machining (EDM) is a non-traditional machining process that involved a momentary spark discharges through the fluid due to the potential difference between the electrode and the workpiece. In EDM, improper choose of the electrode material may cause poor machining rate (or) performance. This is due to material removal rate characteristics. Less material removal rate (MRR) needs more time for machining process and become waste which is not good for production. Hence in this study, the effect of input parameters of EDM process ie. electrode type, peak current, gap voltage, and duty cycle on material removal rate of H11 steel are experimentally investigated. A L18 Taguchi’s standard orthogonal array is used for experimental design. Conventional Copper (Cu) and powder metallurgy (PM) copper tungsten (CuW) are used as tool materials. It was found that conventional copper tool electrode gives maximum MRR and best parametric setting for maximum MRR was found at, Cu (99% Cu) tool electrode, 9 ampere current, 50 volts gap voltage and 0.92 duty cycle. ie. A1B2C2D3.
EXPERIMENTAL STUDY OF ELECTRO DISCHARGE MACHINING FOR INCONEL MATERIAL
In this paper, the cutting of Inconel 718 material using electro discharge machining (EDM) with a copper electrode by using Taguchi methodology has been reported. The Taguchi method is used to formulate the experimental layout, to analyse the effect of each parameter on the machining characteristics, and to predict the optimal choice for each EDM parameter such as peak current, gap voltage, duty cycle and pulse on time. It is found that these parameters have a significant influence on machining characteristic such as material removal rate (MRR), electrode wear rate(EWR), radial overcut(ROC) and half taper angle. The analysis using Taguchi method reveals that, in general the peak current significantly affects the MRR and pulse on time significantly affects the EWR.
The Alzheimer's Disease Home Hospice Knowledge Scale: development, validity and reliability.
BACKGROUND
Several instruments are available to assess knowledge about hospice care, but none specifically address knowledge about home hospice for persons with Alzheimer's disease (AD).


AIM
To develop and validate the Alzheimer's Disease Home Hospice Knowledge Scale (AD-HHK-S).


METHODS
A total of 107 Israeli family caregivers of persons with dementia (mean age=71.2; 73% female) participated in the study.


RESULTS
The AD-HHK-S included 28 true/false items assessing 3 areas of knowledge: knowledge about hospice, knowledge about home hospice, and knowledge about home hospice for AD. Good internal reliability was found, with Cronbach alpha ranging from 0.72 to 0.85. Good face, construct and predictive validity were found.


CONCLUSIONS
The AD-HHK-S proved to be a valid and reliable tool to assess knowledge about hospice care in the area of AD. It might provide an effective tool for palliative care nurses to communicate with family caregivers of persons with AD at the end of life.