Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Tool Geometry


Theoretical and Experimental Investigation of Tool Inclination Angle in Turning Operation

Ali Abbar Khleif; Farhad Mohammad Kushnaw

Engineering and Technology Journal, 2011, Volume 29, Issue 1, Pages 116-128

This paper introduces a mathematical model to calculate the amount of tool
inclination angle in turning operation depending on controlling the chip flow along the
cutting edge, and to simplify the setting of this angle and the direct relation with nose
setting distance, a model is achieved to calculate the setting nose distance instead of
changing the inclination angle. Results conducted on a series of experiments by
changing tool nose setting distance where most of the cutting conditions kept constant,
except tool nose setting below and above the workpiece centre, and its effect of
obtained surface roughness was measured at each step.
Theoretical results for finishing turning operation, for depth of cut less than 1
mm, show that setting tool nose below the workpiece centre will be similar to that of
setting positive angle of inclination.
The main function of the derived model of the inclination angle is to make
equal chip flow along the cutting edge and the chip will be cured far enough from the
machined surface and therefore eliminate the chip and hence improve the workpiece
surface roughness.
The proposed theoretical model proved that in external turning with finishing
operation the suggested inclination angle (λ) must have positive values, and the setting
distance has a negative value. While in the experimental work, the workpiece surface
finish has been improved when setting distance has negative value below the
workpiece centre.

Predictive Modeling of Surface Roughness Of Centered And Un-Centered Workpiece Lengths In Turning Operation

Abdullah H. Singal; Farhad M. Kushnaw; Ali Abbar Khleif

Engineering and Technology Journal, 2010, Volume 28, Issue 1, Pages 65-71

The attempt of the present study has addressed an area that has been relatively
neglected in the past researches. This area focuses on studying and analysis the effect
of different centered and un-centered workpiece lengths, using turning machine
tailstock, on the products surface roughness, and then collecting data to generate an
experimental charts and equations for the prediction modeling of surface roughness
and increasing productivity for many turned products. These charts and equations
could be serving as a quick indication for manufacturers to avoid pre-chatter conditions
and the trial and error methods, and consequently reduce the required experience in
this field. So, the applicable range of workpiece lengths can be safely extended from
10 mm to 60 mm bars with 10 mm in diameter, and from 10 to 75 mm bars with 20
mm in diameter. This range could be increasing as bar diameter increasing and vise
versa.