First mini lathe project, oscillating steam engine.

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Stilldrillin:

--- Quote from: Ross on March 24, 2012, 08:36:00 AM ---
--- Quote from: saw on March 23, 2012, 04:20:39 PM ---I turned the diameter to 3.00mm
As I told you you have to turn the diameter to 2.94 mm otherwise it will fail. :poke:

--- End quote ---

Surely 0.06mm would make too much of a difference?

--- End quote ---

Frankly, I don't think two thou', will make any difference at all....... :scratch:

You're doing well, Ross! :thumbup:

David D

Bluechip:
I have some 3mm stainless round which mikes up as 3.09mm. Why, I don't know. But as 3.09mm is some .0035" less than 1/8" I would guess it's actually 1/8".

Bought together with some 4mm & 5mm which are correct. Seen off AGAIN ... :bang:

Anyway, I can get a 3mm thread on that OK.

Sure you have brass, Ross ?? Not something awful like drawn Phosphor Bronze ??

Die opened out properly, some need to be all the way out. ??

I would suggest if it will do ally, it should do CZ121 brass .. aluminium is mostly rubbish stuff to thread, depending on the grade.

BC

EDIT Try putting a taper lead to start the thread .. like a long chamfer ...

Dean W:

--- Quote from: Bluechip on March 24, 2012, 05:22:16 PM ---I have some 3mm stainless round which mikes up as 3.09mm. Why, I don't know. But as 3.09mm is some .0035" less than 1/8" I would guess it's actually 1/8".
--- End quote ---

3.09mm is .0035" too big for 3mm and .0035" too small for 1/8". You got the shaft both ways. ; )

Ross:
Didn't get as much done as I'd hoped this weekend.

I Finnish turned all sides on the base and put a chamfer on the top. I'll see how it looks once it is assembled it may look better with steps.

As or the threading on the brass I'll give it another go when I do the trunion pin M4.

Ross:
Hi everyone

Just took a break form this project and I'm getting back into the swing of it now.

Today I made the trunion bolt.

first I turned the end down to roughly 4mm for the M4 thread. The depth of the hole on the cylinder was 6mm.

I then threaded the diameter and turned the rest of the bolt to 5mm

I drilled the 5mm hole in the plate that will hold it all together.

I parted off the bolt and faced the head to a sensible length and our a slight chamfer on the top.

The finished product:

I'll try and make the brass parts for the portholes tommorow.

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