Gallery, Projects and General > Project Logs
The Return of No. 83, a Hot Air Engine
vtsteam:
Wow! That's industrial level. Very nice! :dremel: :thumbup:
shipto:
--- Quote from: vtsteam on March 12, 2025, 08:28:29 AM ---Wow! That's industrial level. Very nice! :dremel: :thumbup:
--- End quote ---
Thank you run by a 2.2kw motor on an inverter can make scrap in no time at all. :lol:
vtsteam:
Having a smaller lathe is no disadvantage when making scrap! :thumbup:
vtsteam:
Well the graphite arrived early so we're back on track. :dremel:
vtsteam:
I was looking forward to working with the graphite this afternoon, but in measuring the cylinder to get a diameter for turning, I just didn't like what I found with a telescopic gage. I still had a small amount of oval, and taper. Also I didn't like the cross hatch finish, which was more appropriate to an IC engine. I tried lapping again with the lap I'd made earlier. But it was too small, and I didn't have enough adjustment to compensate.
I don't think I like an aluminum lap. The engine had been originally built with a lead lap that I'd cast onto an arbor, then turned to size. It made a great lap, and the abrasive bedded well, and it gave a really nice finish but I don't like working with lead any more. So I decided to try a wood lap.
I had a turned piece of oak that I'd earlier used as an slip fit arbor for thinning one of the displacer cylinders. I turned this down to just undersize -- a tight slip fit really on the power cylinder, and then charged it with abrasive and kerosene (parrafin oil). Here's the lap as used, it took off lots of fine brass:
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