+++
title = "Nanometre-cutting machine using a stewart-platform parallel mechanism"
author = ["Thomas Dehaeze"]
draft = false
+++

Tags
: [Stewart Platforms]({{< relref "stewart_platforms" >}}), [Flexible Joints]({{< relref "flexible_joints" >}})

Reference
: ([Furutani, Suzuki, and Kudoh 2004](#orgaf9f119))

Author(s)
: Furutani, K., Suzuki, M., & Kudoh, R.

Year
: 2004

-   Lever mechanism to amplify the motion of piezoelectric stack actuators
-   Use of flexure joints
-   Eddy current displacement sensors for control (decentralized)

{{< figure src="/ox-hugo/furutani04_ctrl_arch.png" >}}

-   Isotropic performance (cubic configuration even if not said so)

Possible sources of error:

-   position error of the link ends in assembly => simulation of position error and it is not significant
-   Inaccurate modelling of the links
-   insufficient generative force
-   unwanted deformation of the links

To minimize the errors, a calibration is done between the required leg length and the wanted platform pose.
Then, it is fitted with 4th order polynomial and included in the control architecture.


## Bibliography {#bibliography}

<a id="orgaf9f119"></a>Furutani, Katsushi, Michio Suzuki, and Ryusei Kudoh. 2004. “Nanometre-Cutting Machine Using a Stewart-Platform Parallel Mechanism.” _Measurement Science and Technology_ 15 (2):467–74. <https://doi.org/10.1088/0957-0233/15/2/022>.