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Pim Witkop

About me

Mechanical Engineer, designer and fabricator with a keen interest in motorcycles and travelling. This page is about completed and ongoing projects. Ranging from theoretical modelling to series production of sheet metal products.
Much of the content is work in progress, I hope to add much more content in the coming weeks.

Research & Modelling


Impedance and Mobility method

An introduction to the Impedance and Mobility method for the dynamic modelling of plain journal bearings.


Dynamic modelling of an offset journal bearing

A paper on the benefits of offset style journal bearings in oscillating systems without load-reversal.

Unconstrained Optimization

Unconstrained Optimization Algorithms

An introduction to first- and second order unconstrained optimization algorithms.

negative stiffness

Negative stiffness mechanism

A paper on the design, modelling and validation of a printable actuating mechanism for hand orhosis.

Elastic Foundation

Beam on an Elastic Foundation

An elastic foundation is used to compute a more accurate solution for the displacement of a clamped beam.


Compliant XY pen plotter

A 3D printed compliant pen plotter demonstrating the benefits of flexures in simple mechanisms.



Motorcycle Engine Protection

Description of the design and fabrication process of an aluminium engine protection for the Honda XL600V.


Lowered Motorcycle Footrests

Article about the design and fabrication process of stainless-steel footrests with improved ergonomics.


Motorcycle Suspension Brace

Suspension brace.

Rotopax fueltank

Husqvarna enduro luggage frame.

A small luggage frame suited for a Rotopax fuel tank for use in small rally-raid events.


Aluminium Toolbox for the XL600V

A toolbox designed to replace the smaller original unit, using the same mounting points and locking mechanism.

XLV engine

Demo Engine Casing

A Honda 600cc V-twin motorcycle engine converted for educational purposes.

CR 500 triple

CR 500 suspension repair

Small repairjob on a stripped thread in a part of the front suspension of a Honda CR500.


Honda NX250 Street-tracker

Fabrication of a sub-frame, fuel tank mounts and other bits and pieces for a client.

XLV fueltank

24L Fuel Tank for the XL600V.

Adapting the sheet metal on a 24 L Honda XRV750 fuel tank to fit the XL600V motorcycle.


Aluminium radiator guards.

Laser-cut aluminium radiator guards for the Honda XLV/XRV.

WRF luggage frame

WRF enduro luggage frame.

Stainless-steel luggage frame for short enduro trips.


Various exhaust projects.

Travel & Adventure


Motorcycle trip to Kyrgyzstan and back.


Want to get in touch? Email me at info@PimWitkop.nl.