"A Beginners Engine" From Model Engineer.

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ParCan:

BOTHER BOTHER BOTHER ( or something similar)

The M3 Holes for the cylinder caps were rather to shallow. I went back through with a 1st and 2nd tap as far as I dare.
The 3rd tap was getting tight so backed it out. Was about a mm to shallow still.

I guess you know where this is going......

I got to where I stopped last time, 1/4 on 1/2 back. 1/4 on 1/2 back 1/4 on 1/4 back and that was it.
After a good careful wiggle On and off the tap was trapped.
More fluid but alas it was stuck on the back cut.

Anyway made the Crosshead posts this am.
They are currently all over length at the moment.
I can take the tops off on the mill to make em all the same height.
Whats the best way to do these on the lathe ?

NickG:
I just measured how much needed taking off each one with a mic and then took a final facing cut in lathe.

ParCan:
Managed to get a bit of workshop time over the weekend.

Crankshaft Bearing holders are done. Not happy with these so will probably re make.
Crankshaft bearings are done.
Pillars are complete and all the same height. Broke yet another Tap. I'm really not doing well with these small threads and it's always on the Back cut.
The 16mm Steel Bar I had was a freebie and does not cut or machine well. It's not even round by about a mm. Really cheap n nasty no doubt.

If there is 1 lesson I have learned from this project is cheap nasty metals do not help you. They are not nice to machine, Don't give you a nice cut, the finish is poor and it's not consistent to machine.
The Sash Weights are Glass hard in places, Machines wonderfully in other areas. Drilling the ports the drill would go in clean and nicely for a few mm then start to snag and snatch, I'd get through the hard bit and it'd drill fine again.

I still have not got the tap out of the Cylinder. Going to try and heat it tomorrow. It'll be double or quits.

temporary Base is made from 1/8" Perspex and drilled. I plan to use this as a template for the real base.

I have started the initial assembly. Can't complete without M2 nuts, I really do hope these turn up on Monday.
With luck I will be making a video on Tuesday...

NickG:
Alex, I learnt that a while back and started buying in what metal I needed - it is much easier to machine, get better results and can save any heartache! I've not got bits left over that I want to use up but have found myself wasting time brining stuff down to size as I've said. Next project I will buy what I need for the price of it, I am quite spoilt by having M-Machine metals only 7 or 8 miles away though.

ParCan:
Despite heating the Cylinder and really carefully trying to get the tap out, it's broken inside.

Oh well. win some and lose some....

With the Inlet / Exhaust on the wrong sides of the valve and 2 broken taps in the cylinder I may well remake them.

The rest is now together and runs fairly smoothly.

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