OverlapStrap Z Skates

I have built the first of the Z skates for OverlapStrap.They can be tightened using the 4 M4x40 bolts, and when tightened just right they run very smoothly. I haven’t had a chance to upload any drawings of the parts that make it up yet.

This image gives you an idea of angles at which the bearings are arranged.


OverlapStrap Y Roller and Chassis

I have tried to make the chassis constrained the same way as it is in the original mendel, however I am relying on gravity to hold the chassis down so I only need 6 bearings in total for the chassis. Below is a picture of the chassis mounted to the OverlapStrap frame.

OverlapStrap Y Skate

The main reason my plans for this repstrap deviate from the work being done by bodgeit was because he uses 606 bearings. I wanted to use the M4 bearings that are part of the Mendel Bill of materials. Instead I have made these skates inspired by those used in the build your cnc project.

The M4 bearings are mounted on 1/2″ x 1/2″ x 1/8″ Aluminium Equal Angle which I picked up from eBay

As usual the dxf files can be found here

Using reprap software on ubuntu karmic amd64

The reprap software comes with rxtx and java3d binaries needed for 32bit architectures so getting the reprap software working on amd64 either means installing 32bit version of java or installing native 64bit versions of the libraries. I preferred the latter option here is how I did it.

For java3d its a simple these can simply be installed using
sudo apt-get install libjava3d-jni
For rxtx you can download binaries for the latest pre release version here expand the zip using
unzip Downloads/rxtx-2.2pre2-bins.zip
copy the 64 bit binary to /usr/lib
sudo cp rxtx-2.2pre2-bins/x86_64-unknown-linux-gnu/librxtxSerial.so /usr/lib
Now all that has to be done is to soft link these libs to where the reprap software expects them to be
cd  reprap-mendel-20100105
rm lib*.so
ln -s /usr/lib/jni/libj3dcore-ogl.so
ln -s /usr/lib/librxtxSerial.so