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Biax conversion lives - and dies....
Firstly a small correction: the Ozito multi tool motor produces 300W, not 250W as posted at the top.
Anyway, I finished the conversion. It works and looks the part.
Unfortunately, I had a little accident during final assembly :doh: - I dropped the Biax gearbox very awkwardly on the armature on the workbench.... and damaged one of the windings irreparably... :oo:
However, since this was to be a re-motoring demonstration and proof of concept, I did what I could to keep it alive for a while and continued reassembly.
Sadly - or maybe gladly - I learnt that there are no spare parts available for many of the Ozito range of tools! :oo: So that wasn't a good choice anyway...
Once assembled and everything moving the way it should, I ran the motor despite the damage. It works as expected: a bit slower than intended (due to the damaged winding) and gets hot quite quickly. However the soft start and variable speed works nicely.
I'll decide at some point if I buy another Ozito tool to use the scraper or keep looking out for a more "industrial strength" powertool to do a final conversion, preferably a brand that keeps spares for a while...
If anyone has any good suggestions for a suitable drive motor, I'm all ears!
The little Biax air motor pinion and shaft was through hardened, but I managed to turn the plain end down to 4.5mm with a ceramic insert to fit into the electric armature spindle. It turned out very well. Sorry, I didn't take a photo of that step.
Next I drilled and bored the armature spindle end to a nice tight fit for the pinion 'peg' and Loctited it in. Checking concentricity turned out to be very good at less than 0.02mm at the gear end.
The adapter plate was registered on the boss of the Biax gearbox cover and screwed on with 3 screw that used to hold the air motor in place.
I then drilled the 4 screw holes to fit the motor housing and milled the register bosses and angled ventilation slots. Then I marked the body shape of the Ozito housing on the adapter and shaped it (sanding disk) to transition to the Biax gearbox housing to look right.
Next I painted the adapter plate to match the Biax parts.
Here are the photos of the completed conversion:
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