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Metal choices for sliding parts

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smfr:
Thanks for all the suggestions, folks! I think I'll go with cast iron for the slides, steel for the crosshead. If I decide to scrape, this would be my first scraping attempt, but I'm not sure I want to invest in scraping tools just for this small job. Are there small-scale scraping tools for small parts? Also, I was planning on the slides being L-section, but I suspect that scraping into a corner is hard, or should I just add some corner relief?

Simon

Jasonb:
Its such a small area that scraping won't really be needed.

I have ground the end of an old file in the past to use as a scraper.

J

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