Gallery, Projects and General > How do I??

Drilling small holes

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Darren:
Thanks guys,  :thumbup:

I have quite a few pieces of this left over 4mm brass, enough to last me out I'm sure. I only remembered about them yesterday being tucked away in a box.

I could cut some 16mm brass bar that does machine nicely, and drill, but that seems such a waste. So I will try annealing either later today or tomorrow.

John, would you treat a drill bit this way for this type of brass that produces swarf? I'd guess not but thought it may be better to ask as I've already ruined four pieces and a few drill bits.

Thanks  :thumbup:

bogstandard:
Darren,

The brass drills are really only for the normal yellow brass that comes off as fine dust or chips.

I think you will have to resign yourself to only being able to drill your sheet stuff thru it's thickness, as it looks like it is work hardening the deeper you go.

It should make good cover plates and engine mounting plates though. So all is not lost.

John

Darren:
Thanks Guys,

I should have realised that there was something different about this plate brass as I've drilled other brass with tiny holes with no problems at all.

It just didn't occur to me last night in the frustration.

Live and learn as they say, all good fun  :ddb:
It's good to now have it categorised for future ref  :thumbup:

Darren:
Stew,

I found this chart, did you mean CZ121? That seems to be the most common brass available.

CZ133 seems to have tin added.......nice chart, maybe put it in the reference section?

http://www.cnc.me.uk/brass.html

bogstandard:
Now you know why it is so difficult to categorise the brass we get from the scrappies, we take a chance on it being a good one, most times it is OK, sometimes it can cause the sorts of problems you are having.

John

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