Machining gun metal

Machining gun metal

This topic has 4 replies, 4 voices, and was last updated 19 October 2018 at 19:40 by Thor 🇳🇴.

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19 October 2018 at 11:59 #376616
Eric Cox
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@ericcox50497
When machining gun metal should it treated the same as brass and cut at a high speed
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19 October 2018 at 11:59 #9378
Eric Cox
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@ericcox50497
19 October 2018 at 12:38 #376619
Neil Wyatt
Moderator
@neilwyatt
Gunmetal is generally a very well-behaved metal! It machines better than bronze but isn't as prone to lots of needle like chips as with brass. You are best approaching it as if it was a very free-cutting mild steel and I wouldn't recommend zero-rake flat topped tools that you might use for brass. Because 'gunmetal' covers a lot of ground (generally most copper/zinc/tin alloys there's fair bit of variation.

Neil
19 October 2018 at 13:07 #376627
Mick B1
Participant
@mickb1
Many of the bits I make for the local railway are in LG2 – leaded gunmetal. I treat it the same as CZ121 brass and don't meet any issues I can readily think of. Batches are small, typically 4 – 12 components, so maybe I'm not doing enough to expose any real differences.
19 October 2018 at 19:40 #376676
Thor 🇳🇴
Participant
@thor
Hi Eric,

I have machined LG2, and as Mick I run the work at about the same speed as you would for free cutting brass.

Thor
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