[Swansea Hackspace] 3/8" Knob, anyone?

[Ceri Clatworthy]

If Hackers one is not up and running.
Then I can print one.
If you can find something on thingiverse.com. ..
Or STL.

Ceri
On 28 Feb 2015 21:30, "Ceri Clatworthy" <ceri.clatworthy at gmail.com> wrote:

> You can just 3D print a new knob. ...
>  On 28 Feb 2015 20:10, "jon lilley" <jon.j.lilley at gmail.com> wrote:
>
>> Does anyone know where I could pick up a control knob to fit a 3/8" shaft?
>>
>> I've got an old variac that's missing its knob, and I'm having difficulty
>> finding a source for something that will fit. :(
>>
>> I thought of using a shaft coupler to step down to a 1/4" shaft, but I'd
>> really prefer one that just fitted.
>>
>> Thanks,
>>      Jon
>> On 28 Feb 2015 18:59, "Justin Mitchell" <justin at swansea.hackspace.org.uk>
>> wrote:
>>
>>>
>>> > Just found circuit diagram,
>>> >
>>> > http://reprap.org/mediawiki/images/7/7d/Melzi-circuit.png
>>> >
>>> > we could simply re-map Hot end to the AUX header, and change code in
>>> micro
>>> > ??
>>> >
>>> > Hot End on PA7 -> PA4.
>>> >
>>> > just need a 4K7 resistor !!
>>> >
>>> > Bit concerned that ALL sensors have 4u7F caps on them !!
>>> >
>>>
>>> Having poked around the circuit diagram for the Melzi some more, it
>>> turns out that EXT-A4 is also where the debug LED is wired on the board,
>>> so marlin has that configured as an output, and it has resistors on it
>>> etc.
>>>
>>> I have moved the temp sensor parts to a pin header so that i could more
>>> easily change which input they connected through to.
>>>
>>> With the thermistor remapped to A3 i now get plausible temperature
>>> readings
>>>
>>> Should now be possible to reassemble the printer with the old board
>>> whilst we work on repairing the larger board required for the upgrades
>>> to be fitted.
>>>
>>> _______________________________________________
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>>> Hackspace at swansea.hackspace.org.uk
>>> http://swansea.hackspace.org.uk/mailman/listinfo/hackspace
>>>
>>
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>>
>>
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