reb78 Posted February 13, 2011 Share Posted February 13, 2011 I bought one of these: http://www.machinemart.co.uk/shop/product/details/dga1-drill-grinding-attachment/path/bench-grinders-grinding-wheels Seem to be getting okish results with it, but i cant quite get tip of the drill looking symetrical as a new drill looks. Does anyone else have one of these and have any tips? I'm worrid that i got the lip rest too close to the wheel and have damaged it (only very slightly), but will this affect how the drill sits and is ground? Quote Link to comment Share on other sites More sharing options...
simonr Posted February 14, 2011 Share Posted February 14, 2011 The tool looks quite a clever way of getting the angles right - but as you say, does little to make the drill symmetrical. The only option is on each flank, count the number of times you run it over the grinding wheel, trying to get the same pressure & duration. Then make sure each flank gets the same number of passes. This is all I do when I'm manually sharpening drills and it seems to get it pretty accurate. Si Quote Link to comment Share on other sites More sharing options...
Jeff Young Posted February 14, 2011 Share Posted February 14, 2011 Yeah, about the best you can do is practice. I never got very good at it before switching to a Drill Doctor (mostly because it could do split-points). They also take a bit of practice, but I found it easier to get even pressure and duration with their pivot system. Jeff. Quote Link to comment Share on other sites More sharing options...
P H Services Posted February 14, 2011 Share Posted February 14, 2011 I bought a drill doctor as well they are brilliant get my vote every time even though they arent cheap !!!! Quote Link to comment Share on other sites More sharing options...
treebloke Posted February 14, 2011 Share Posted February 14, 2011 I have a similar set up and although it some times works it's more by luck than judgement. Off to do some thing I am good at now, dig the garden . Quote Link to comment Share on other sites More sharing options...
Phil Hancock Posted February 14, 2011 Share Posted February 14, 2011 Ive got a donkey years old Picador one and when i last used it the results were very good. But the ones sold now i believe have an issue that makes the results poor. I will check on the model engineering forum as im sure it was covered on there with pictures that showed the manufacturing error. Quote Link to comment Share on other sites More sharing options...
longlandy Posted February 14, 2011 Share Posted February 14, 2011 If you cant sharpen a drill by hand using a scribing jig to check even grinding you shouldnt be using drill bits .....As was drummed into us as apprentices Quote Link to comment Share on other sites More sharing options...
simonr Posted February 14, 2011 Share Posted February 14, 2011 If you cant sharpen a drill by hand using a scribing jig to check even grinding you shouldnt be using drill bits .....As was drummed into us as apprentices Oh! That's a bummer! I cant do it with a jig - even though I can without one. Maybe I should stick to milling interpolated holes? Si Quote Link to comment Share on other sites More sharing options...
longlandy Posted February 14, 2011 Share Posted February 14, 2011 I was having a laugh not a dig. Though if you can mill interpolating holes with a manual mill(to tolerance) Ill bow down down to your greatness,though a scribing tool is very useful on large drills where just eying through is not enough. Quote Link to comment Share on other sites More sharing options...
minimog Posted February 15, 2011 Share Posted February 15, 2011 i was once told by an old engineer to use two nuts welded together along the flats (it dousent mater weather they are m8 or m30) but the angle between the two are the perfect angles for a drill i have a m24 one in my box and use it every time i need to sharpen drill Quote Link to comment Share on other sites More sharing options...
simonr Posted February 16, 2011 Share Posted February 16, 2011 i was once told by an old engineer to use two nuts welded together along the flats (it dousent mater weather they are m8 or m30) but the angle between the two are the perfect angles for a drill i have a m24 one in my box and use it every time i need to sharpen drill That's spot-on! Sadly, I have the sense not to try and manually mill interpolated holes - it's much easier to select "circular pocket" then the diameter and depth and go off and put the kettle on while the mill figures it out I have tried in the past but even with a set of tables for how much to turn each handle - it still looked rubbish! Si Quote Link to comment Share on other sites More sharing options...
longlandy Posted February 17, 2011 Share Posted February 17, 2011 I did think by having to do the working out you must be running a old paper feed nc machine! Quote Link to comment Share on other sites More sharing options...
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