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| snapped centre drill |
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| Jonny:
Even easier just break up the broken centre drill or what ever in the hole, works every time. Blind holes can be more intricate certainly small items ie 7BA. |
| Arbalist:
Next time try using a spotting drill. :thumbup: |
| kayzed1:
I think i may have some spotting drills in some far away draw :doh: mind i did wonder what they were for when i got them some years ago. I will give the heat a try tomorrow while i await the Alum i ordered from Eblag.. Many thanks all. Ow! i forgot to say, i can not do photo's as my broadband is so slow, around the old dial up speed as i live in the back of beyond BUT. we are getting Fibre very soon, then you can look out it'll be pics every where. :thumbup: Lyn. |
| Stilldrillin:
Lyn. Centre drills, are for drilling holes, for centres. Spotting drills, are for spotting drilling positions. Also, for leaving a chamfer, around the finished hole....... David. |
| sparky961:
--- Quote from: Stilldrillin on December 06, 2015, 05:29:51 PM ---Lyn. Centre drills, are for drilling holes, for centres. Spotting drills, are for spotting drilling positions. Also, for leaving a chamfer, around the finished hole....... David. --- End quote --- I've been baffled by how many professional experienced machinists are oblivious to this fact. I've even been told at the very beginning (while using a spotting drill) that I should use a center drill to start the hole. |
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