Gallery, Projects and General > How do I??

Drilling small holes

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sbwhart:

--- Quote from: Darren on May 04, 2009, 05:42:59 AM ---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

--- End quote ---

Yes thats the one  :thumbup:

Stew

kellswaterri:
Hi Darren, hows about trying these...Spade drills... I have found them extremely useful when drilling small holes...I found that the twist drill type tended to pull themselves in to brass or gunmetal a little too quickly for my liking.

http://www.cousinsuk.com/catalog/6/1074/1587.aspx

All the best for now,
                           John.

Darren:
Thanks for the link, unfortunately they don't seem to stock them anymore.

Could we make these from Silver Steel rods? Bit small maybe?

kellswaterri:
Hi Darren, yes I think that they would be a little difficult to make at that size, although I have made them out of sowing needles on occasions, here is another link you might try...

http://www.eternaltoolshorology.com/spade-drills.htm

All the best for now,
                           John.
P.S.
Well worth watching the video on the home page if you are going to use the sherline.

Darren:
Thanks John K, all interesting stuff I will look into those spade bits... :thumbup:

I did try annealing this hard brass to cherry red but it didn't make any difference, still snapped the bit off. I had a look at another damaged bit and it was rounded off. I think there are two things going on here. One is the drill bit tip is being grabbed solid and on other occasions the brass is work hardening almost in an instant as suggested. It must go pretty hard to do that to a drill bit.

I have now started the parts again with some hex stock, it's a bit tight due to the size I have, but I think it should work out ok.
I have drilled the small holes with no mis-haps, amazing, I have learnt a lot about brass these last couple of days.

Can someone tell me the dia and height of 2mm allen screw heads please, I have my mill set-up and it would be better not to disturb it until I have this info. Why I didn't put some 2mm screws on my last order I don't know. I'd like to counter bore the heads if I can.

Thanks for all the help here guys, really appreciated...  :nrocks:

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