Stick Slip Stability by Transfer Lubrication

1978 ◽  
Vol 192 (1) ◽  
pp. 259-268 ◽  
Author(s):  
G. Cockerham ◽  
G. R. Symmons
Keyword(s):  
Cast Iron ◽  
Mechanical System ◽  
Surface Finish ◽  
Experimental Results ◽  
Stick Slip ◽  
Vibratory Motion ◽  
Effective Transfer ◽  
Slip Motion

A transfer lubrication technique has been used successfully in stabilising the vibratory motion of a mechanical system subject to stick slip. The most effective transfer lubricants were found to be p.t.f.e. and graphite lubricating steel on steel and cast iron on cast iron junctions respectively. In addition the effectiveness of three different surface finish conditions for the slideway has been examined. Experimental results are shown to correlate well with current stability theories and also indicate the practical limitations of the transfer lubrication technique in converting stick slip to a steady continuous slip motion.

A Study of the Stick-Slip Motion of Machine Tool Feed Drives

1969 ◽  
Vol 184 (1) ◽  
pp. 543-560 ◽  
Author(s):  
R. Bell ◽  
M. Burdekin
Keyword(s):  
Cast Iron ◽  
Simple Model ◽  
Machine Tools ◽  
Dynamic Measurements ◽  
Stick Slip ◽  
Feed Drive ◽  
Feed Drives ◽  
Stick Slip Motion ◽  
Lubricant Viscosity ◽  
Slip Motion

The phenomenon of ‘stick-slip’ oscillations of the feed drives of machine tools is an important problem in the design of certain types of machine tools. The factors contributing to this particular type of instability are studied both experimentally and analytically with the aid of a simple model based on dynamic measurements. The experimental work is restricted to a scraped cast iron-cup ground cast iron slideway interface. The principal experimental variables are lubricant viscosity and the natural frequency of the drive. The dynamic observations provide evidence and data that enable the use of a simple model rather than the more usual application of an involved analysis. The consideration of analytical and experimental results allows further understanding of the mechanism of feed drive instability to be developed.

Stick-Slip Motion of Machine Tool Slideway

1974 ◽  
Vol 96 (2) ◽  
pp. 557-566 ◽  
Author(s):  
S. Kato ◽  
K. Yamaguchi ◽  
T. Matsubayashi
Keyword(s):  
Boundary Conditions ◽  
Machine Tool ◽  
Static Friction ◽  
Experimental Results ◽  
Kinetic Friction ◽  
Stick Slip ◽  
Frictional Coefficients ◽  
Stick Slip Motion ◽  
Slip Motion

Stick-slip motion of a moving element on an actual machine tool slideway is investigated experimentally under various sliding conditions, and the fundamental characteristics of the stick-slip motion are clarified. Based on these experimental results, the characteristics of static friction in the period of stick and kinetic friction in the period of slip are studied concretely so as to clarify the stick-slip process. It is shown experimentally that static and kinetic frictional coefficients can be expressed with simple formulas. Using these expressions, the boundary conditions for occurrence of stick-slip motion are examined, and the relation between properties of the stick-slip motion and frictional characteristics is explained quantitatively.

Changes in Mechanical Properties of Cast Iron GTW 35-04 under the Surface Parameter during Drilling

2013 ◽  
Vol 404 ◽  
pp. 86-90 ◽  
Author(s):  
Jozef Jurko
Keyword(s):  
Mechanical Properties ◽  
Cast Iron ◽  
Surface Finish ◽  
Experimental Results ◽  
Surface Parameter ◽  
Damage Process ◽  
Cutting Zone ◽  
Basic Hypothesis

The problem of drilling holes with diameter D=2 to 8 mm resides in the fact that 35 to 40% of these holes do not comply with prescribed requested requirements. This study also includes an analysis of accompanying phenomena in the cutting zone by measuring some selected parameters. The basic hypothesis of this article focuses on the study changes in mechanical properties of cast iron GTW 35-04 under surface finish when drilling. The problem of drilling holes with diameter D=2 to 8 mm resides in the fact that 20 to 25% of these holes do not comply with prescribed requested requirements, [, [. This article presents the results of experiments focusing on the study of the damage process in helical drills with diameter d=5.5 mm when drilling into cast iron GTW 35-04. This study also includes an analysis of accompanying phenomena in the cutting zone by measuring some selected parameters. Experimental results were verified in the production of holes in products for the computers.

Dynamics of stick–slip motion, Whillans Ice Stream, Antarctica

2011 ◽  
Vol 305 (3-4) ◽  
pp. 283-289 ◽  
Author(s):  
J. Paul Winberry ◽  
Sridhar Anandakrishnan ◽  
Douglas A. Wiens ◽  
Richard B. Alley ◽  
Knut Christianson
Keyword(s):  
Stick Slip ◽  
Ice Stream ◽  
Whillans Ice Stream ◽  
Stick Slip Motion ◽  
Slip Motion

Dynamic simulation of stick–slip motion of a flexible solar array

2008 ◽  
Vol 16 (6) ◽  
pp. 724-735 ◽  
Author(s):  
Yasushi Kojima ◽  
Shigemune Taniwaki ◽  
Yoshiaki Okami
Keyword(s):  
Dynamic Simulation ◽  
Solar Array ◽  
Stick Slip ◽  
Stick Slip Motion ◽  
Slip Motion

scholarly journals Basal ice motion and deformation at the ice-sheet margin, West Greenland

2005 ◽  
Vol 42 ◽  
pp. 67-70 ◽  
Author(s):  
David M. Chandler ◽  
Richard I. Waller ◽  
William G. Adam
Keyword(s):  
Deformation Mode ◽  
Time Intervals ◽  
Stick Slip ◽  
Active Deformation ◽  
West Greenland ◽  
Shear Structures ◽  
Basal Ice ◽  
Ice Velocity ◽  
Stick Slip Motion ◽  
Slip Motion

AbstractMeasurements of basal ice deformation at the margin of Russell Glacier, West Greenland, have provided an opportunity to gain more insight into basal processes occurring near the margin. The basal ice layer comprises a debris-rich, heterogeneous stratified facies, overlain by a comparatively debris-poor dispersed facies. Ice velocities were obtained from anchors placed in both ice facies, at three sites under 5–15 m ice depth. Mean velocities ranged from 20 to 43 m a–1, and velocity gradients indicate high shear strain rates within the basal ice. Stick–slip motion and diurnal variations were observed during measurements at short (1–5 min) time intervals. Vertical gradients in horizontal ice velocity indicate two modes of deformation: (1) viscous deformation within the stratified ice facies, and (2) shear at the interface between the two basal ice facies. Deformation mode 1 may contribute to the folding and shear structures observed in the stratified facies. Deformation mode 2 may generate the stick–slip motion and be associated with the formation of debris bands. Active deformation close to the margin suggests that structures observed within the basal ice are only partially representative of processes occurring near the bed in areas away from the glacier margin.

Experimental Exploration of Schallamach Waves and Self-Excitation in a Belt-Drive System

2018 ◽  
Author(s):  
Yingdan Wu ◽  
Michael Varenberg ◽  
Michael J. Leamy
Keyword(s):  
Angular Velocity ◽  
Dynamic Behavior ◽  
Oscillation Amplitude ◽  
Operating Conditions ◽  
Drive System ◽  
Belt Drive ◽  
Stick Slip ◽  
Stick Slip Motion ◽  
System Inertia ◽  
Slip Motion

We study the dynamic behavior of a belt-drive system to explore the effect of operating conditions and system moment of inertia on the generation of waves of detachment (i.e., Schallamach waves) at the belt-pulley interface. A self-excitation phenomenon is reported in which frictional fluctuations serve as harmonic forcing of the pulley, leading to angular velocity oscillations which grow in time. This behavior depends strongly on operating conditions (torque transmitted and pulley speed) and system inertia, and differs between the driver and driven pulleys. A larger net torque applied to the pulley generally yields more remarkable stick-slip oscillations with higher amplitude and lower frequency. Higher driving speeds accelerate the occurrence of stick-slip motion, but have little influence on the oscillation amplitude. Contrary to our expectations, the introduction of flywheels to increase system inertia amplified the frictional disturbances, and hence the pulley oscillations. This does, however, suggest a way of facilitating their study, which may be useful in follow-on research.

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