Sinter 4: M10 bolt, new flask, air cool

jes / 3d-metal-printing

Notes and information about 3d metal printing

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Sinter 4: M10 bolt, new flask, air cool #4

Open jes opened 5 years ago

jes commented 5 years ago

Plan here is to use an M10 bolt model (oversized by 10% in x/y and 6% in z).

Improve on last time by:

Make a new flask that is nice and big
Give the plaster over 24 hours to dry
Embed a thermocouple inside the part so that we can measure the actual temperature inside
Let it air-cool instead of quenching it, and try to see if there is still powdered material inside, whether there are cracks in the plaster, etc.

jes commented 5 years ago

Printed +10% in x/y and +6% in z.

I printed 2 just in case it's convenient to have another ready.

jes commented 5 years ago

Before sintering:

Mass: 13.4g Distance across flats: 18.6mm Total height: 43.5mm Thread pitch: 1.7mm

jes commented 5 years ago

Oops, I forgot to embed a thermocouple inside the part, and now the plaster is too hard to be able to insert one. Will have to try the embedded thermocouple idea next time.

Planning to give this the rest of today and all day tomorrow for the plaster to set, and then sinter it on Wednesday.

jes commented 5 years ago

The plaster still felt very slightly damp to the touch this morning, but I put it in anyway and ran the usual temperature profile. It's just finished, and I've left the part in the furnace but opened the lid to help it cool down. I'll try and take the part out tomorrow morning after it's cooled down and see what I find.

jes commented 5 years ago

Mass after sinter: 10.4g (-22%)

Distance across flats: 17 - 18 mm depending on where you measure it Total height: 42mm (-3.5%) Thread pitch: 1.5mm (-12%)

jes commented 5 years ago