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[Andy B]

....
to give us something to do me and a couple of others are going to be making a gauge for our key rings cos we're so far ahead. its basically just an angled piece of metal (at 59o). this what you mean? or the drill bit itself? 

That's what I found on the net. The gauge I meant has a point that you sit the end of the drill on so that you can scribe each side of the drill on to check each side is the same ....... far too difficult to describe, far easier to show you in the metal. 

got ya mate 

There was a guide in a cupboard at work. I asked a few of the lads what it was, nobody knew - even the old barstewards like myself. I'll try to remember to photo it in use. (not back in work till Tuesday though  - assuming Warren B hasn't closed it by then  )

that would be really useful mate, thanks 

I doubt that you'd be using morse taper drills that big in the motor trade 

[henryd]

.... and ill just keep practising    ...... 

You can either sharpen a drill ..... or you can't. I know some fitters that have socks older than you  & still can't sharpen one.

I can! 

Me too

[aaronjb]

An old fella I know (runs, owns & builds Crendon Replicas) once told me - as he sharpened a drill bit with an angle grinder w/ a slitting disc, freehand with no glasses - that the easiest way to check the angle of the end is to hold it up to a suitably sized nut.. the angle of the faces of the nut should be the same as the end of the drill.

No idea how accurate that is but the drill he sharpened certainly worked well when I used it after that!

[Webby the Bear]

Afternoon boys, hope youre all well 

As I mentioned previous;y me and 3 others are so far ahead we got to make a drill bit gauge with a 59 degree angle. Here's mine 



I put a 5mm hole in it and used an m6 tap to make a small thread for m6's. i also put 1cm grooves to make a little bit measurer. at the end is filed down to make a flat blade screw driver and the big hole is for my key ring.

tomorrow i'm filing a spark plug gapper and pitch gauge on it just cos i can 

Exams Wednesday 

Also boroowed this set to do my mates french crap oil change and noticed this triangle bit  what would that be for ?? (pictured below, back row, 3rd in from the left)

[Webby the Bear]

not worked real hard today. as said well far ahead and am twiddling my thumbs a bit. however... made an addition to the drill bit gauge... a spark plug gapper 

[Webby the Bear]

...not that ill ever use it  but still cool to have made and keep 

[TheBoy]

...not that ill ever use it  but still cool to have made and keep 

Its all good practice

[Webby the Bear]

...not that ill ever use it  but still cool to have made and keep 

Its all good practice

had a few issues with drilling metal lately. for these gauges we're using mild steel. sometimes the drill bit goes straight through (using a pillar drill) like butter. other times (even with sharpened drill bits) it takes forever. wonder why? 

[Andy B]

.... other times (even with sharpened drill bits) it takes forever. wonder why? 

Incorrect clearance on the cutting edge of the drill 

[Webby the Bear]

.... other times (even with sharpened drill bits) it takes forever. wonder why? 

Incorrect clearance on the cutting edge of the drill 

Thanks Andy. What does that mean though 

[Andy B]

.... other times (even with sharpened drill bits) it takes forever. wonder why? 

Incorrect clearance on the cutting edge of the drill 

Thanks Andy. What does that mean though 

Easier to show you than describe.  The cutting edge of the drill has to be the first & only bit of thedrill to make contact with what you're drilling. It's easy to grind a drill so that the cutting edge doesn't actually make proper contact with the metal/whatever and you're trying to drill with the face that you've just ground.

http://en.wikipedia.org/wiki/File:Drill_twist_1.jpg

[martin42]

your using pattern drill bits lol 

[Webby the Bear]

your using pattern drill bits lol 

Don't say that Martin, Ralf'll be e-mailing me for details 

[omega3000]

your using pattern drill bits lol 

 


Many times i have been drilling with no effect , changing drill bits with no result  Only to realize ive had the drill in reverse 

[Marks DTM Calib]

Other thing is technique, your looking to get an almost continuous length of swarf off so the drill is cutting  all the way.

Once it statrts to skid without cutting it work hardens the metal and drilling becomes much harder (and can then snap the bit)