# Study on the Position Deviation between the Iron Roughneck's Spin-Rollers and the Drilling Tool
## 4 Conclusions  
The position deviation between the iron roughneck's spin-rollers and the drilling tool was studied in this paper, and the following conclusions are drawn:  
1. The position deviation of the drilling tool in the \(x\) direction (lateral direction) is the main factor affecting the working performance of the spinner mechanism and reducing the position deviation in this direction can effectively improve the spin performance. 2. If using the spinner mechanism with three spin-rollers, when a single follow-up roller contacts the drill pipe first, the deviation in the \(x\) direction of the drill pipe axis can easily occur. With the increase of the deviation of the drill pipe axis, the deviation of the driving roller axis in the x direction and \(y\) direction also increases gradually, and the deviation of the driving roller axis along the \(y\)-axis direction is significantly greater than that of the drill pipe axis. 3. Within the effective working range of the spinner mechanism, the larger the diameter of the drill pipe, the greater the deviation of the axis of the driving roller. The larger deviation directly affects the stability of the screwing action and the screwing effect. 4. The deviation of the drill pipe and the spin-rollers can be reduced by replacing a single follow-up roller with a symmetrically arranged double follow-up roller, thus ensuring \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multicolumn{1}{c}{\begin{tabular}{c} **Drill Pipe Inclination** \\ **Angle (\({}^{\circ}\))** \\ \end{tabular} } & \multicolumn{2}{c}{\begin{tabular}{c} **Drill Pipe** \\ **Deviation Angle (\({}^{\circ}\))** \\ \end{tabular} } & \multicolumn{2}{c}{\
\begin{tabular}{c} **Dimensional** \\ **Deviation (mm)** \\ \end{tabular} } & \multicolumn{2}{c}{
\begin{tabular}{c} **Working Condition of** \\ **Spinner Mechanism** \\ \end{tabular} } \\ \hline \(x\) **Direction** & \(y\) **Direction** & \(x\) **Direction** & \(y\) **Direction** & \(x\) **Direction** & \(y\) **Direction** & \\ \hline
90.00 & 89.90 & 0 & 0.10 & 0 & 3.52 & Good \\ \hline
90.00 & 89.85 & 0 & 0.15 & 0 & 5.28 & Good \\ \hline
89.95 & 89.80 & 0.05 & 0.20 & 1.76 & 7.04 & Good \\ \hline
90.00 & 89.85 & 0 & 0.15 & 0 & 5.28 & Good \\ \hline
89.95 & 89.80 & 0.05 & 0.20 & 1.76 & 7.04 & Good \\ \hline
90.00 & 89.85 & 0 & 0.15 & 0 & 5.28 & Good \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Position deviation of the drill pipe and spin condition of the spinner mechanism with double follow-up rollers. the centering performance and realizing reliable screwing action. In this example, the drill pipe has no position deviation in the \(x\) direction, and the position deviation in the \(y\) direction is between 3.52-7.04 mm, which meets the working requirements of the spinner mechanism. This paper's research provides a theoretical and methodological reference for reducing the position deviation of drilling tool axes. In addition, good machining accuracy and mechanism floating performance are also important links to eliminate or reduce axis deviation. The limitation of this paper is that the length of the drill pipe or the drill pipe stand used in different constructions is different, but the length of the drill pipe used in this experiment is relatively short, which will be different from the deviation size and working state in actual construction. However, the research results reflect the influence law of different deviations on the spin operation and are suitable for application to similar mechanisms. Conceptualization, Y.S. and Q.L. ; methodology, Y.S. and Q.L. ; software, Y.S. and Q.L. ; validation, Y.S., Q.L. and X.Z. ; formal analysis, Y.S. and X.Z. ; investigation, Y.S. and Q.L. ; resources, Y.S., Q.L. and X.Z. ; data curation, Y.S. and Q.L. ; writing--original draft preparation, Y.S. ; writing--review and editing, Y.S., Q.L. and X.Z. ; visualization, Q.L. ; supervision, Y.S. ; project administration, Y.S. ; funding acquisition, Y.S. All authors have read and agreed to the published version of the manuscript.