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| Fergus OMore:
Daz, You should draw the annullar ring to full size and draw your tool cutting into the ring. I'm guessing that you need a lot of facets in your cutting tool rather than, I suspect, the normal Two. Again, you want to grind a little waist- like a golf club end. It's got to be 'titchy'. Hope this helps |
| loply:
Drawing indicates the recess is just for weight purposes, presumeably therefore is dimensionally flexible. Consider using a holesaw? They work surprisingly well without the pilot drill installed... |
| Fergus OMore:
I was also suggesting a 'hole saw' but with one Granny's tooth. Aged and ageless stuff! |
| BillTodd:
How about a broaching cutter (like a posh hole saw) it'll give better finish and will probably be quicker of it's a production job. http://www.lawson-his.co.uk/scripts/products.php?cat=Blue%20Up%20To%2050mm%20Dia%20%28L%3D25mm%29 |
| Fergus OMore:
Actually,I sent Daz a picture of how GHT made a small boring tool. I made mine from a bit( pun intended) of HSS round and waisted ( not wasted it) to make a Harry Lauder stick or golf club. As I said to Daz, it's the lirttle bit at the end what does the job. What we( well, most of you) have gone so far along a branch that you have forgotten that round tool steel can be made to follow all sorts shapes. If push comes to shove, a round bit of hss can be a broken bit of a drill. GHT used broken little centre drills! I'll get me coat!!!!!!!! Bye |
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