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

[Graham Owens]

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> 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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>>
>
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>
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