As they say a twist drill is only a roughing tool. People write scientific tomes about drill geomrtry but it mainly boils down to two sharp edges and a bit of relief. For smaller drills have you come across the DAG Brown four facet jigs, one is good for drills down to less than 1mm the other can be made for up to about 6mm, but as they are hand powered the larger sizes take more effort so other powered devices like yours are more use. Just a note but the shank of a drill is always smaller than the cutting end.
Hi Chris, I used to have a (I Believe) a wish bone drill sharpener for sharpening small drills which used to work well. Nowadays I don't seem to need to drill very small holes very often since taking to Motor Cycles after Model Engineering. I tend to buy smaller drills for one off use so have no need for a small drill sharpener any more. The smallest drill I have used lately has been about 1.2mm. I wouldn't like to use my drill sharpener for anything much smaller than 3mm but it is really handy for the rest up to 12mm. I did know that shanks of drills are smaller than the business end.
@@bobrodgersonsmostlymotorcy9265 forgot to add, I'm reluctsnt to drill small holes but dometimes it is a requirement, a couple of weeks ago I was asked to make an emulsion tube for some ancient japanese carb that involved a dozen or more sub-millimetre holes, didn't break a single drill but clearly used up my share of luck as the next couple of jobs were, well shall we say if i had any hair on top, i would have none afterwards.
As they say a twist drill is only a roughing tool.
People write scientific tomes about drill geomrtry but it mainly boils down to two sharp edges and a bit of relief.
For smaller drills have you come across the DAG Brown four facet jigs, one is good for drills down to less than 1mm the other can be made for up to about 6mm, but as they are hand powered the larger sizes take more effort so other powered devices like yours are more use.
Just a note but the shank of a drill is always smaller than the cutting end.
Hi Chris, I used to have a (I Believe) a wish bone drill sharpener for sharpening small drills which used to work well. Nowadays I don't seem to need to drill very small holes very often since taking to Motor Cycles after Model Engineering. I tend to buy smaller drills for one off use so have no need for a small drill sharpener any more.
The smallest drill I have used lately has been about 1.2mm. I wouldn't like to use my drill sharpener for anything much smaller than 3mm but it is really handy for the rest up to 12mm. I did know that shanks of drills are smaller than the business end.
@@bobrodgersonsmostlymotorcy9265 i thought you might but it was the way you were measuring that drill that prompted me to make the observation.
@@bobrodgersonsmostlymotorcy9265 forgot to add, I'm reluctsnt to drill small holes but dometimes it is a requirement, a couple of weeks ago I was asked to make an emulsion tube for some ancient japanese carb that involved a dozen or more sub-millimetre holes, didn't break a single drill but clearly used up my share of luck as the next couple of jobs were, well shall we say if i had any hair on top, i would have none afterwards.
@@chrisstephens6673
Hi Chris, that's probably the sort of job I am most likely to need to drillll small holes in these days.