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jeff2wings
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Had a free afternoon so spent the afternoon on the lathe, basically bringing the o/d to final size and parting off to length and then deciding that the thread form wasn't exactly too my liking and taking another cut.

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also found the offcut of brass  I was looking for so made another intake 

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Next I will need to lap the cylinder and size the piston and c/p to size after soldering the intake and transfer on

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cylinder for second engine 

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boring to size 

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and as  I need to make another crankshaft for the Speary, may as well make a couple for the Westbury atoms 

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In total it took me 9 hours to make but the ease of setting up and surcurity of holding the crankshaft more than make up the expenditure of time. 

 

 

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One of three to be made for Westbury Atoms Minors 

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Started my crank/crank pin turning this afternoon.

Your Vee block gave me the inspiration, and it has worked well, albeit nowhere near the elegance, but I'm working with limited facilities (my best excuse).

 

 

Can I ask Jeff how you get such good surface finishes?

 

Seems you use HSS tools, not replaceable carbide tips, is that the secret/

I'm struggling to keep the tips good machining the En8.

 

Edited by 911hillclimber
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Speed,feed and depth of cut,l'm running 200 rpm 20 thou cuts and hand fed face cut,I prefer hss as it seems more tolerant of interrupted cuts and of course you can regrind/shape them too suit,btw when you put a cut on how do you measure it as there are no graduations on your cross slide ? are you using a dial indicator?

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Found the Hemmingway design on the web page, nice approach.

 

The cuts I use are by instinct, 1/4 turn to 1/2 turn seems to be about 10 thou and I can cut 2 to 3 " in about 10 to 15 seconds all by hand turning the center screw on the round bed. I have a dodgy digital caliper to use to see how i'm progressing and down to the final pass.

 

All a bit by touch and sound!

 

Oddly, there is a graduated dial under the cross slide to set the angle od a taper cut, but you need a torch to read it.

That is the only graduated control.

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Jeff,  When you say you are making Sparey 2,0, Doyou mean the 0.63cc Diesel? It certainly looks like it,but I am puzzeld by the apparent two piece crankcase?  Presumably you have put another layer on so that you can machine the front transfer,rather than solder on  a cover?

Keith.

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  • 2 weeks later...

A cNot had a great deal of spare time but have made a bit of progress on the second Speary although I needed to do some reworking in order to correct a mistake I made and one made previously by the guy that I bought the casting sets from.

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so wot happened was,I screwed the rear cover in and it got stuck, like proper stuck so I had to machine the hole thing out and then repair the damaged threads and the previous mistake by welding

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Once squared up I cut the recess and then brought it out to size and re-cut the thread ,then too take an actual step forward, soldered the intake and transfer on 

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also found time to fixthe broken and missing timer arm on the Ok super 60

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