| Gallery, Projects and General > How do I?? |
| Drilling! - small holes on the mill and centre drills |
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| John Stevenson:
Sorry, I just make things........................ I did go to Oxford University, does that count ? Didn't study anything, just delivered 28 tonnes of bricks. John S |
| Dean W:
Aw Lew... Lighten up just a bit, bud. But seriously, can you get me an autograph from 007? It's not for me! My Thirty-something daughter thinks he's great. |
| Rob.Wilson:
--- Quote from: craynerd on July 19, 2010, 06:51:00 AM ---Here comes one of my dumb questions but I have to ask since I`ve learnt a lot from this thread. Rob - you sent a link for a 6mm spotting drill. Can I just clarify that you would have a set of these for each size hole? I`ve lost the plot a little as it seems that John is using them to cut the hole directly...say I wanted a 5mm hole and quite a depth, would I need a 5mm spotting drill to start the hole and then move onto my regular 5mm drill bit? Or say my hole was 5.5mm, would I use a 5mm spotting drill to "spot" the hole and then go in with my regular 5.5mm drill or whatever to finish it? I suppose I`m asking are these just used to spot the hole and I only need a couple of sizes or are you using them to drill through? Chris --- End quote --- Hi Chris Not a dumb question at all ,,,,,,,,,,,,, I only have a few sizes , about the same rang as a set of centre drills ,the example i posted was the first on the Ebay search ,good price for a solid carbide drill , and as you said they are used for spotting for the drill , just the same as you would with a centre drill ,,, You can use them to drill all the way through the work as in the example John S posted , when the hole to be drilled is not as deep as the flute length . This is just an example ,,,,,,,, I need to drill the holes in the bolt pads on my engine casting , 10mm spot drill and large centre drill BSO3 i think Centre drill in the chuck ,,,,,,,,,,it dose not reach the pad, chuck hits the casting 10mm spot drill ,, no problem ,as they are a bit longer ,,,,,, Or you could spend more money and get long reach centre drills or just extend a standard one . Regards Rob |
| raynerd:
Rob, nice one - makes sense, thanks for the info from you all. As Kwackers mentioned, I have inhereted many centre drills but as has been said, I have found the little stub break off and to be honest many are so old are worn they need binning. I think I`ll give spotting drills a go and order a few. |
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