"A Beginners Engine" From Model Engineer.

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sbwhart:
Looking good Alex.

NickG is building his from the other end and he came across a couple of mistakes on the drawings so her they are:-

Part MP39 crank shaft spacer the hole is 6mm diameter

Part MP30 crank shaft better to make it 100mm long

Part MP33 Main Bearing it should be 10mm wide

I've added V2 of the drawings

Cheers

Stew

NickG:
Looks great. I may use the same method fir the cyl / caps unless i get my rotary table up and running and am feeling confident!

ParCan:
Hi Nick
I have a rotary table but no method of fixing a chuck to it.
My Table is also rather cheap n nasty with heaps of lash in it.

I centred the Cylinder with the end cap glued in place.
Chuck up a bit of 4mm rod (that fits in the gland hole) Use that to centre it.
There is a vertical V in my vice. Used that to locate the cylinder in the vice for when I turned it over.

NickG:
Mine is a 6" vertex and feels great with little backlash but never used it, the clamps look good too, 1 either side of the table. I had no way of putting chuck on it either but have just bought an ML7 so have ordered a 2mt to myford thread adaptor which would let me leave the bits in the chuck and transfer to the table. Should be an interesting experience if nothing else!

Ah good idea, i've tried something similar in the past but don't have the luxury of the vee in the vice.

I also bought stevensons er32 collet blocks sq and hex for this sort of thing but then realised my collet set is er25 - doh!

ParCan:
Hi again.

Another productive day.
Crankshaft, Con Rod and Crosshead completed.

I Started 3 Crank Webs just in case. All 3 came out pretty much perfic.
Crankshaft was all rather loose so I decided to Pin it. Broke a drill in 1 web so that became the spare by default.
I decided to use screws as the pins. Easy to get out. Final will have Grub Screws in it I hope.

The Con Rod I decided to make as 1 bit.
I didn't have any steel the correct width which would make attaching the Big End bearing a bit of a nightmare.
I also don't have any 1/4 square Brass. (I plan to mill the cross head slides from what I have)

I did the crosshead on the Mill. It's a tiny bit shorter than the drawing.
Also note. The M3 Thread for the Piston Rod should be M4.

Big and Small end bearings are Oilite Bushings I had in stock.

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