Drill hard cast iron 1.7mm 10ba clearance

Drill hard cast iron 1.7mm 10ba clearance

This topic has 5 replies, 6 voices, and was last updated 27 August 2024 at 21:52 by Baz.

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27 August 2024 at 18:52 #749354
Peter Venn
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@petervenn53369
I have a casting of the Chimney on my Adams O2 which I’m building and it is fully machines and ready to mount on the smoke box. However I have found it impossible to drill the base of the casting to accept 10 BA bolts to hold it on. ordinary HSS bits don’t touch it and I ordered some cobalt 1.5 mm and 2 mm drillbits but they don’t seem to want to touch it either!!

Does anybody have any suggestions about how to soften the casting enough to get a drillbit through it?
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27 August 2024 at 18:59 #749360
bernard towers
Participant
@bernardtowers37738
Put it in your BBQ
27 August 2024 at 19:07 #749369
JasonB
Moderator
@jasonb
Fire or BBQ, get it to red heat and hold for an hour or two and then let it cool SLOWLY in the ashes overnight.
27 August 2024 at 21:12 #749415
John Haine
Participant
@johnhaine32865
If it’s that hard I wonder how it was machined?
27 August 2024 at 21:31 #749428
Andrew Johnston
Participant
@andrewjohnston13878
Use a carbide drill.

Andrew
27 August 2024 at 21:52 #749435
Baz
Participant
@baz89810
I agree with Andrew, use a carbide drill but belt and braces job, give it a good cooking in the BBQ as well. If it doesn’t work you will need to find someone with a spark eroder.
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