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Model Forum / General / Models / August 2010drill small holes at an angle?
I would like to make a series of 3mm angled holes (20,22,24 degrees) in a small piece of Tufnol, around 12 mm deep. I have quite a few hand tools (both woodworking and metalworking), but my only powertool is a drill in a wolf stand. The angle is enough to make starting a 3mm drill at all "interesting", and getting the hole in the right place "more interesting". My approach so far is to use a piece of 2x4 sliced off at the desired angle with my Nobex mitre saw, as an angled table, with a drill vise holding the workpiece. I used this as the drill: http://galootcentral.com/components/cpgalbums/userpics/10152/drill_stand.jpg http://galootcentral.com/components/cpgalbums/userpics/10152/drill_stand_rule.jpg I would welcome hints or tips. (I'm making a more-engineered version of the gadget discussed here http://www.knifeforums.com/forums/printpost.php?tid/871697/ which is just a piece of scrap hardwood) BugBear > I would like to make a series of 3mm angled holes > (20,22,24 degrees) in a small piece of [quoted text clipped - 16 lines] > > http://galootcentral.com/components/cpgalbums/userpics/10152/drill_stand_rule.jpg Cool drill! > I would welcome hints or tips. When I have to drill accurately angled holes I get a dremel or something and make a flat spot to drill into, so I'm starting off into the flat rather than starting off into an angle. -- Peter Fairbrother > (I'm making a more-engineered version of the gadget discussed here > http://www.knifeforums.com/forums/printpost.php?tid/871697/ > which is just a piece of scrap hardwood) > > BugBear >> I would like to make a series of 3mm angled holes >> (20,22,24 degrees) in a small piece of [quoted text clipped - 18 lines] > > Cool drill! Why, thank you! Here's more, in a thread where I eventually identified it. http://www.ukworkshop.co.uk/forums/post268761.html?highlight=drill#268761 BugBear >I would like to make a series of 3mm angled holes > (20,22,24 degrees) in a small piece of [quoted text clipped - 7 lines] > drill at all "interesting", and getting the hole > in the right place "more interesting". Simples. Start the hole with either a centre drill or a small end milling cutter (slot drill). The other way is to use sacrificial material. Cut two slices of summat similarly hard, wood will do, at the desired angle and clamp the tufnol between them. You now have horizontal surfaces top and bottom and the Tufnol at the desired angle in the middle. Much more buggering about than using a centre drill though.  SignatureDave Baker bugbear laid this down on his screen : > I would like to make a series of 3mm angled holes > (20,22,24 degrees) in a small piece of [quoted text clipped - 23 lines] > > BugBear I would start the drill vertically into the material at the required centre, then tilt either the drill or the material over to the required angle once it is deep enough not to skittle off centre. SignatureRegards, Harry (M1BYT) (L) http://www.ukradioamateur.co.uk > I would start the drill vertically into the material at the required > centre, then tilt either the drill or the material over to the required > angle once it is deep enough not to skittle off centre. That's frankly, and sorry to be blunt, asinine advice which is about the best way of breaking drill bits and ensuring the hole won't be on centre I've ever heard. SignatureDave Baker > > I would start the drill vertically into the material at the required > > centre, then tilt either the drill or the material over to the required [quoted text clipped - 3 lines] > best way of breaking drill bits and ensuring the hole won't be on centre > I've ever heard. Don't hold back man - say what you mean !!! AWEM >> I would start the drill vertically into the material at the required >> centre, then tilt either the drill or the material over to the required [quoted text clipped - 3 lines] > best way of breaking drill bits and ensuring the hole won't be on centre > I've ever heard. Frankly Dave, I don't understand the difference between your earlier advice and Harry's. Both seem to advise starting the hole by making a dimple or tiny hole then changing the angle of the drill. Please explain what I am missing. Cliff Coggin. >>> I would start the drill vertically into the material at the required >>> centre, then tilt either the drill or the material over to the required [quoted text clipped - 8 lines] > dimple or tiny hole then changing the angle of the drill. Please explain > what I am missing. Nowhere in my post did I advise changing the angle of the drill nor can I see how it could be read like that. Having already set up the Tufnol at the required angle I said simply to start the hole with a centre drill or a milling cutter, neither of which would drift off centre like an ordinary drill when starting into an angled surface. Personally, having both tools, I'd use a 3mm milling cutter to generate a small flat perpendicular to the drilling axis, then start the hole with a small centre drill as is normal practice and finish with the ordinary drill. No need to move the workpiece or the drilling angle again during any of this. SignatureDave Baker > Personally, having both tools, >I'd use a 3mm milling cutter to generate a small flat perpendicular to the >drilling axis, then start the hole with a small centre drill as is normal >practice and finish with the ordinary drill. No need to move the workpiece >or the drilling angle again during any of this. Yup. What he said. Regards, Tony. >>>> I would start the drill vertically into the material at the required >>>> centre, then tilt either the drill or the material over to the required [quoted text clipped - 18 lines] > practice and finish with the ordinary drill. No need to move the workpiece > or the drilling angle again during any of this. Sorry if I misunderstood you. Why would a centre drill at an angle to the work not drift off centre when it has the same angled cutting edges as a full size drill which does drift? I don't see the difference, because, except for the change in size, the geometry of tool and work are the same and so the forces involved are the same. Cliff. > Sorry if I misunderstood you. Why would a centre drill at an angle to the > work not drift off centre when it has the same angled cutting edges as a > full size drill which does drift? I don't see the difference, because, > except for the change in size, the geometry of tool and work are the same > and so the forces involved are the same. I think the shorter, thicker (for much of its length) centre drill will drift less, under the same forces. BugBear >> Sorry if I misunderstood you. Why would a centre drill at an angle to the >> work not drift off centre when it has the same angled cutting edges as a [quoted text clipped - 6 lines] > > BugBear Exactly. I use a centre drill to start holes a lot, simply because they go where they are put. I've also made use of a slot drill too, that works well for the workpiece set an angle. > Personally, having both tools, > I'd use a 3mm milling cutter to generate a small flat perpendicular to the > drilling axis, then start the hole with a small centre drill as is normal > practice and finish with the ordinary drill. So make a flat so there are no deflective forces, and then use a deflection resistant drill anyway! Belt and braces. BugBear >> Personally, having both tools, >> I'd use a 3mm milling cutter to generate a small flat perpendicular to the [quoted text clipped - 3 lines] >So make a flat so there are no deflective forces, >and then use a deflection resistant drill anyway! Exactly. Regards, Tony >> Personally, having both tools, I'd use a 3mm milling cutter to generate a >> small flat perpendicular to the drilling axis, then start the hole with a [quoted text clipped - 5 lines] > > Belt and braces. Not really. Twist drills are not designed for starting accurate holes or to be self centering even when running into a perpendicular surface. Good practice is to always start a hole with either a centre drill or a spotting drill. Having an angled surface to work against only adds the single step of milling a perpendicular flat before starting to drill. All of this is very basic workshop practice - no rocket surgery involved. SignatureDave Baker >I would like to make a series of 3mm angled holes >(20,22,24 degrees) in a small piece of [quoted text clipped - 23 lines] > > BugBear I like the drill stand as well (GRIN) Why not just drill your hole square to the magnet face and insert a bit of 3mm rod that you have bent to the required angle? Richard >> I would like to make a series of 3mm angled holes >> (20,22,24 degrees) in a small piece of [quoted text clipped - 8 lines] > Why not just drill your hole square to the magnet face and insert a > bit of 3mm rod that you have bent to the required angle? I want multiple angles. I actually want multiple block with multiple holes, giving me angles from around 4-30 degrees. I thought I had a better chance of making angled holes; the blocks are also small and easy to store. Oh - I'm using a bamboo (kebab) skewer as my pointer. BugBear > I would like to make a series of 3mm angled holes > (20,22,24 degrees) in a small piece of [quoted text clipped - 24 lines] > > BugBear I'd make a metal jig with guide holes at the required angles. Clamp the jig to the Tufnol and drill through the guide hole. Marks on the jig would enable accurate alignment. SignatureRegards, Gary Wooding (To reply by email, change gug to goog in my address) |
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