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| mechman48:
Finally got all the bits together to fit a power drive to my mill x axis; a 12v window wiper motor, 110/220v -12v transformer, 12v PWM speed controller, some 3 core cable & some other bits 'n' bobs. I made up the framework from some 10mm aluminium plate, a couple of 10mm rounds. For the coupling I used a couple of spare sockets I had from an old imperial set together with a universal joint from the same set, to link the two I fitted a piece of 1/4" key steel with a spring over to keep the two sockets located on the modified leadscrew end & the motor shaft. I fabricated a cover from a piece of .5mm aluminium sheet I bought from a local DIY retailer & fastened on to the framework with a couple of 4mm SHCS. It works quite well, giving me linear speeds of.. @ min.rpm - 18mm/ per min. & at the fastest rpm - 140 mm/per min.... max motor- speed 30rpm. The only thing that is concerning me is a after a few minutes operation (trial run) the motor seems to get overly warm so I was querying have I missed something in the build? I have tested the amperage... low rev amps- 2... max rev amps- 3.8, PWM speed controller input 12.2v output... 12.1v. Have put a torque wrench on to the leadscrew & it doesn't even register 1ft/lb to turn so there isn't a lot of resistance. Can anyone assist? :scratch: Have att. some pics for your perusal... |
| Bluechip:
George: [1] 12v transformer ? I do hope there is a rectifier in there somewhere ?? [2] A 12V transformer will be giving some 17V if rectified and a smoothing cap. attached. [3] Wiper motors do tend to run a bit warm but not really hot. If it warms up then stabilises at that temp. it's probably OK. These motors are continuously rated to all intents and purposes ... they are expected to run for hours on end .. Any clue as to what temp. it gets to? Dave |
| mechman48:
Dave, Thanks for your response... Transformer bought on e bay (China) with description including overload protection, in line fuse, switchable voltage, blah, blah, & it aint a little thing so I am making the assumption that it will include a rectifier ? If I can find the details I will post for your delectation. Another transformer I considered was just a block of windings in a frame... 240v in & 12v out (3 wires in ? - 2 out) with no pc board containing resistors, capacitors, heat sinks etc. etc hence why I'm assuming the one in use will have a rectifier :scratch: . Cheers George |
| mechman48:
Dave ... Transformer link...as best as I can remember.. http://www.ebay.co.uk/itm/Hot-AC-110V-220V-to-DC-12V-10A-120W-Voltage-Transformer-Switch-Power-Supply-/221503522940?pt=UK_Light_Fittings&hash=item3392a3887c |
| Bigbadbugga:
I was hoping to build one using a stepper motor and an arduino, but this looks like a neat solution too. Any video of it in action? :thumbup: |
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