Machinist John
Plastic
- Joined
- Jul 14, 2017
- Location
- Clark County WA, USA
I have not worked with much cast iron and/or ductile iron for several years. Made glands and pistons for hydraulic cylinders mainly. That being said I'm starting work on a new prototype project, proto will start life as 6X6 piece of bar roughly 12.5" long for now(future iterations will likely be cast). Starting material will be Ductile Iron 65-45-12, machine will likely be my TM1-P as I'd rather contaminate 10 gallons of coolant than 100. Normally run cast dry but from what little I've found to read about ADI using coolant can gain considerable tool life and surface finish.Final product is spec'd to be Austempered Ductile Iron of 125-80-10.
On to the questions; I am to rough this part out pre HT which from what I've researched the material will expand 0.2-0.4%. Ideally how much should I leave on here to finish afterwards? Another issue I have, some of these drilled and tapped holes have positional tolerances of +/-.002, therefore I'm thinking I will not be able punch any of the holes through until after HT. Anyone have any experience with such material that could offer any preferred practices and tooling choices would be greatly appreciated.
Thank you in advance, John.
On to the questions; I am to rough this part out pre HT which from what I've researched the material will expand 0.2-0.4%. Ideally how much should I leave on here to finish afterwards? Another issue I have, some of these drilled and tapped holes have positional tolerances of +/-.002, therefore I'm thinking I will not be able punch any of the holes through until after HT. Anyone have any experience with such material that could offer any preferred practices and tooling choices would be greatly appreciated.
Thank you in advance, John.
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