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Trephining - Do's and don't. ??

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Nick_G	15/05/2015 15:23:24
1808 forum posts 744 photos	. A recent thread by another member has prompted this question. So rather than risk taking his off topic I shall start another thread. It is something I have never needed to do. (though Jason will state I wasted a good bit of cast iron last week by not doing.) I am presuming there is a correct way of doing this in the same way there are things to avoid when parting off for example. So what sort of tool shape is best needed and is there a practical maximum depth that this could reliably achieve. Nick
Tony Pratt 1	15/05/2015 15:57:35
2319 forum posts 13 photos	Trephining? Tony
Tony Pratt 1	15/05/2015 16:00:14
2319 forum posts 13 photos	Posted by Tony Pratt 1 on 15/05/2015 15:57:35: Trephining? Tony Well blow me just Googled it, I have learnt something today! Never heard it called that before! Tony
Nick_G	15/05/2015 16:50:41
1808 forum posts 744 photos	Posted by Tony Pratt 1 on 15/05/2015 15:57:35: Trephining? Tony Aaaach. Damned spell checker. Serves me right for trusting it. Nick
Capstan Speaking	15/05/2015 19:12:16
177 forum posts 14 photos	Posted by Nick_G on 15/05/2015 15:23:24: I am presuming there is a correct way of doing this in the same way there are things to avoid when parting off for example. So what sort of tool shape is best needed and is there a practical maximum depth that this could reliably achieve. Nick Why is there no other word for thesaurus? But seriously, it should be similar to a parting tool but shallow to clear the curved sides. A round tool bit ground down to the diameter works well. A shallow front clearance angle so as to minimise digging in. Maximum depth will depend on material and rigidity so it's the proverbial piece of string. You only learn by doing

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