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| Oh Blimey I bought a CNC Lathe !!!! |
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| awemawson:
Now I've been monitoring the nominal 3.6 v batteries when they are on charge from the machines internal charging mechanisms, and they rise to about 4.15 volts when the machine has been on a few hours. I decided to supply power to them from a precision regulated supply set to top out at this 4.15 volts, but via an isolating diode (To stop my charger interfering with the internal machine charger) and resistor to limit the charging current. A normal silicon diode has a forward voltage drop of about 0.6 - 0.7 volts - so the supply needs to provide 4.75 to 4.85 volts. I settled on a little board sold by Rapid Electronics based on the LM317 programmable voltage regulator. I replaced it's single turn adjusting 'pot' with a 10 turn one, and scaled it to lie in my close range of voltages) Sadly Rapid did not live up to their name, and it was the lack of this part that has held me up, despite assurances that it was in stock when ordered :( So the physical layout of the machine dictated two further boxes. One to provide two isolated supplies for the Servo Amps and one for the main machine controller - so off we go again knocking holes in boxes: |
| awemawson:
They of course need a bit of paint and some mounting brackets |
| awemawson:
And off we go mounting the electronics inside the boxes |
| awemawson:
Then comes the rather nerve racking bit :bugeye: They need installing mechanically (dead easy !) then the batteries need disconnecting while the machine is running, and the new bit of kit connecting - any slips and the RAM gets corrupted. Amazing how you can fumble dropping 3 mm screws in such a situation :ddb: Anyway they are in, connected and time only will show if they work ok - I'm leaving the back off so I can monitor them for the next few days anyway :med: Andrew |
| lordedmond:
Hope you had your marigolds on messing with that live leccy. H and S would have had a field day Opps I forgot it's only LV :zap: Good work as usual why did they not make it like this when they made the machine ,for firms do have shut downs. What we used to do with boxes like that was to label them as "Isolate else where " and leave it at that makes you stop and think Stuart |
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