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Scale Model Engineering Steam, gas and hot air model engines, tractors and accessories. Machining and milling castings.

Scale Model Engineering

1/3 Case-Reduction Engineering Begining in Califonia

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Old 10-13-2018, 09:19:07 PM
b7100 b7100 is offline
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Default Re: 1/3 Case-Reduction Engineering Begining in Califonia

I never used lube in cast iron. A sharp tap and proper hole size is a necessity. My hubs are cast iron on steel like is in Andrus book. They were bored to a very light pressed fit then lapped in with the green Time Saver lapping compuund. You end up with a perfect running fit. All my axles were done in this manner. They all turn like they are on ball bearings. They must be lapped in to turn smoothly. Its near impossible to turn a shaft and bore a hole perfectly round. I have oil cups and keep oil in them. So far there are no problems. Oilite bearings are probably better but the miles ever put on this engine don't warrant the expense.

---------- Post added at 21:19 ---------- Previous post was at 21:11 ----------

High speed steel taps are a must. The carbon steel like is in most tap and die sets don't work vary well for very long.
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Old 10-17-2018, 08:48:31 PM
chrsbrbnk chrsbrbnk is offline
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Default Re: 1/3 Case-Reduction Engineering Begining in Califonia

the cast iron chips can jamb in between the tap's back relief when trying to back it out causing breakage air hoseing the chips out before backing out helps ( usually into your eyes) also a thinner viscosity threading oil as opposed to a more viscus oil keeps the tiny iron chips clumping together preventing air blowing them out
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