|Well, here it is.
The green motor drives a variable belt gearbox, controlled by the black knob at the right hand side. To this a further reduction, a worm gear, is attached. Originally the drive has a variable output of 19 to 78 rpm. By installing a frequency converter this can be contolled even better (i.e.: slower, down to about 4 to 15 rpm). With the additional belt and pulleys I should come down to a nice 2.5 rpm for figuring.
The black rod in the middle background is the turntable shaft.
The overarm subassembly is planned to go at the right hand side, on the picture in the lower right hand corner, the eccentric drive motor to the lower left hand corner.
|Another view, same stage of
construction. The centers of the shafts are 20 cm (8") apart and will
take 100 mm (drive) and 160 mm (turntable) pulleys.
To the center opening in the front frame a housing will be mounted to hold all the electric things like the FCs, switches and variable resistors (5 kOhm) to control the speed of both main drive and eccentric motor.
All other openings will be covered by plywood or particle board, I just use what's laying around.
|Top view. To the left is the
eccentric drive motor which does up to 13 rpm. Probably not enough for
some tasks, but well, we'll see.
The woodblock with the Nylon® bushing inserted at the bottom of the machine right between the motors is the lower eccentric shaft bearing.
|Almost completed. The brown dish
is a flower pot thing of about 50 cm (20") diameter, it should hold the
slurry. Since the main shaft is a bit too short, and therefore not
allowing for too much space, I may have to attach the dish to the
turntable and not to the tabletop. Loosening two bolts will allow to
take the complete turntable off the shaft. (at the shiny metal thing in
the middle of the TT).
|On top of the electronics box
controls. To the right are two switches plus the emergency shut-off
button. The switches are to turn on the FI one after another since
switching both 'on' at the same time might trip the fuse.
The other buttons are 'Start' and 'Stop', green and red, respectively. The knobs are 5KOhm variable resistor which control the drive speeds.
|This shows a 12" (30 cm) piece of Borofloat on top of the Turntable with the overarm in working position. However, there are still some days left until it is going to accept grit.|
|First Grit on 1 March 2004.
Well there is a lot to be learned for now the minor (and major) construction faults show up like a sore thumb.