+++
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
: <sup id="bedab298599c84f60236313ebaad2714"><a class="reference-link" href="#furutani04_nanom_cuttin_machin_using_stewar" title="Katsushi Furutani, Michio Suzuki \&amp; Ryusei Kudoh, Nanometre-Cutting Machine Using a Stewart-Platform Parallel  Mechanism, {Measurement Science and Technology}, v(2), 467-474 (2004).">(Katsushi Furutani {\it et al.}, 2004)</a></sup>

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
<a class="bibtex-entry" id="furutani04_nanom_cuttin_machin_using_stewar">Furutani, K., Suzuki, M., & Kudoh, R., *Nanometre-cutting machine using a stewart-platform parallel mechanism*, Measurement Science and Technology, *15(2)*, 467–474 (2004).  http://dx.doi.org/10.1088/0957-0233/15/2/022</a> [↩](#bedab298599c84f60236313ebaad2714)