First mini lathe project, oscillating steam engine.

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Ross:
I soldered the cap on today,

And out of curiously I polished it too!

Now I've neely finished the cylinder, I've just got to drill and tap the hole for then trunion pin. It needs to be M3, I got a set of taps for Christmas, but I wouldn't trust a tap as small as that from the set!

So I need to buy a high quality tap and drill, I've found a 3mm tap, it's a reduced to £3 would it be okay just to get a plug tap?

(15th down)

http://www.tap-die.com/contents/en-uk/d140_Metric_taps.html

DaveH:
Ross,

--- Quote from: Ross on March 03, 2012, 11:58:26 AM ---So I need to buy a high quality tap and drill, I've found a 3mm tap, it's a reduced to £3 would it be okay just to get a plug tap?
(15th down)
http://www.tap-die.com/contents/en-uk/d140_Metric_taps.html

--- End quote ---

It can be difficult to start the tap, especially if you don't have a taping stand.
Also one is more likely to break a plug tap(because of the full cutting force) without using a taper tap first.

:beer:
DaveH

andyf:
In brass, I'd use a cheap (Aldi's) tapered tap first, to give a decent plug/bottoming tap (with its point, if it has one, ground away) an easy start.

Andy

Ross:
Today I machined the crank to the correct diameter, I'm waiting for a tapping drill, to arrive for the cylinder.

Ross:
Hi everyone,

Today I got around to drilling and tapping the cylinder. I brought a proper M4 HSS tap as the Chinese taps I have look like they are made out of plastic and I just can't trust them!

I also did a bit more to the crank and turned part of it down so that the hole for the M3 grub screw can be drilled. Tommorow I'll set up up offset in the lathe and drill the hole for the crankpin too.

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