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Drilling! - small holes on the mill and centre drills

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Jasonb:
If I was doing it in the mill I would hold the bar horizontally in the vice, set the spindle over the centre - ruler trick if its not totally accurate or use an edge finder, then use a No1 center drill to get a start and then follow up with the 0.8mm drill.

Done this a lot on my current traction engine as there are a lot of 1/8" pins that are retained by 1/32nd split pins like this



Jason

ksor:
--> craynerd
If the problem is centering the drill on a lathe - here is a nice solution - I found it the other day ... maybe here, maybe on HMEM - I can't remember ... as I remember there was a short video showing the trick on a drill press !

Mount your center drill
Mount the object in the chuck
Put some model clay on the end of the object
place a niddle in the clay so the niddle nearly reaches the cener drill
start spinding - but no TOO FAST !
With your finger you can now "center the niddle"
Now you just have to align the niddle and the centerdrill

But maybe it not the acuracy that you want - a simple and easy method anyway

 

75Plus:
Hey Guys,

Look at the title of the thread :poke: :poke:


"Drilling! - small holes on the mill and centre drills"

ksor:
I have ... but I can't read  :doh: !

kvom:
Another idea:  use an end mill to create a flat area before using the center drill.

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