04 January 2007

Happy New Year!

Hi, and Happy New Year to you all! I hope those who celebrated Christmas had a great one, and the rest of my readers had a good time anyway.

Among my resolutions are to try and use more diagrams, images and photos on OrionRobots, and to try and photo document my projects more often.

Christmas Goodies Reviews to come

In terms of Christmas goodies, among them was a Maplin PIC Programmer Velleman kit.

Lathe work

This is a view of the chuck at its widest extent. I am aware that the transmission between the arms may be vulnerable to kerf, but be aware that the mechanism will be deployed vertically with the job held horizontally, so it should not be in the path of it.

I am yet to document my lathe progress properly. Over Christmas, I worked on a four jaw chuck mechanism for it - all in Lego. It is quite an interesting mechanism - and I will be posting photos, and LDraw CAD designs for it when I find a moment.

More photo’s of the Chuck Mechanism

I have many other photos of the Lathe and need to get them online. I have realised that I need to rebuild the bed and the headstock, as my initial design involved a driven headstock and tailstock, which turned out to be too complicated, but the vestige is a headstock driven from a drive system in the middle of the bed via three axles distributing the high torque expected. This unfortunately is in just the right place to pick up the kerf from the part being turned. It uses two Technic gear motors joined by a differential to drive the headstock, and I expect to keep much of the torque system similar when I do the rebuild. The bed also needs to be bigger - having been resized upwards twice already. The four jaw chuck turned out to be much larger than I expected. I would like to try and scale it down, but try to retain the clamping freedom of movement. It will have to be mounted on a Technic turntable, as a single axle may still pose torsion issues.

I am also expecting to replace the RCX based cutting arm system (using Cybermaster touch sensors for calibration) with an NXT system, so I can reduce the complexity by delegating it to the NXT motors.



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