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| Tapping cast iron for poppin engine. |
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| ian_in_the_midlands:
I am having a go at making a poppin flame licker engine. I have only made a simple Elmer's wobbler before so expect this to be challenging. Expect plenty of questions to come. The plans call for the cylinder to be tapped 2-56. I plan to convert everything to metric, so will use M2 instead. These holes will take screws that hold the cylinder to the standard, and hold the cylinder head on. My questions are: Are there any special considerations/potential problems when tapping cast iron with a small M2 thread? Should I use tapping fluid with cast iron, or tap dry? Thanks. |
| Jo:
Cast Iron is a joy to tap and self lubricating :thumbup: (This is assuming you are not using a recycled piece of CI full of hard spots :palm: ) Jo |
| ian_in_the_midlands:
I think it must be some good stuff. First time I have used it. Managed to cut 15 thin fins on cylinder without any problems. |
| Bradley Simmonds:
95% of the time normal grey cast iron and 3d/sg/ductile iron is even better...you shouldn't ever really have a problem at all. You can tell if you have got the goo stuff-ductile iron as when you machine it, it smells garlicy |
| DavidA:
Spheroidal Graphite iron smells heavily of carbide if you first breath on it then sniff the surface. If you get this result with cast iron, then you need to change your mouthwash. Dave. |
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