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

[Emyr Morris]

Dohh! Obviously!

On Sunday, March 1, 2015, jon lilley <jon.j.lilley at gmail.com> wrote:

> Thanks for the suggestions... Guess I'll have to come along and join at
> some point. :)
> On 28 Feb 2015 23:11, "Graham Owens" <grahamowensuk at googlemail.com
> <javascript:_e(%7B%7D,'cvml','grahamowensuk at googlemail.com');>> wrote:
>
>> The hack space has a mill, no coupler required. Drop in a 1/4" and
>> assuming the body has enough beef on it - machine it our to 3/8" even with
>> flats if required for the shaft.  Problem solved and get to play with the
>> mill at same time :)
>>
>> G
>> On 28 Feb 2015 20:10, "jon lilley" <jon.j.lilley at gmail.com
>> <javascript:_e(%7B%7D,'cvml','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
>>> <javascript:_e(%7B%7D,'cvml','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
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>>>>
>>>
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>>>
>>>
>> _______________________________________________
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>>
>>

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