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Rule of Thumb.

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SPiN Racing:
Ohhh nice.
Im printing that rule of thumb out on 11x17 paper here at work and sticking it on the wall over my lathe next to the Tap and drill chart/poster.


Thanks!

Stilldrillin:

--- Quote from: Bernd on January 14, 2009, 01:04:10 PM ---Ok Dave,

What the heck am I looking at. At first I thought somebody had forgot to clean all the chips (swarf) of the part. Then I noticed numbers and what appears to be the beginings of holes. :scratch:

Oh ,and very big, by the looks of it, well at least quite heavy.

Bernd
--- End quote ---


Bernd, as know it all Boggy says, it`s a rock bit. Minus it`s carbide inserts....
Oh look..... Here`s another!



The numbers are gradings by the inspection dept.
Dependant on size of bit, nominal sizes 10, 12, 14, 16, 18, 20, 22mm. Each size with 5 available grades (coloured), in 5 micron increments.
The holes were drilled to an accuracy of 3 micron........ Mostly!  ::)

The bit was then heated and the buttons driven in.

I really showed that pic for the splining, with side & face cutter.

You might like to see the sort of thing we machined...... From solid......

Overburden drilling parts.







Funny...... I don`t miss working at all.....  :clap:

Bernd:
Thanks Dave.

That was very interesting and educational.

Drill bits to drill holes in the earth. Imagine that. :) Like for gas wells and such right?

Bernd

Stilldrillin:
And many other applications Bernd.

Can`t dig a trench across an airfield runway.
Drill a horizontal hole under it instead........ :headbang:

Holes in Scandinavian permafrost, for telegraph poles......  :clap:

etc, etc........  :thumbup:

sbwhart:
Nice to see a good bit of heavy  :headbang: engineering


Cheers
 :wave:
Stew

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