Accurate Drilling - centering microscope, USB cam, optical punch?

Gallery, Projects and General > How do I??

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Jasonb:

--- Quote from: picclock on June 26, 2011, 02:46:11 PM ---Hi craynerd

Just mount on the X and Y table axis and read off the display directly.

--- End quote ---

As I said above if you don't know one or both of the x & y dimensions this method is no use. Chris is using a depthing gauge to mark the centre not a given dimension :doh:

Troutsqueezer:
Before I added DRO's to my X2, my method was to mark the hole locations using blue Dykem and a scribe (calipers drug along the edge usually). Then with the part mounted in the mill, I would use a spotting drill and eyeball it (using magnifiers) and then, with the motor turned off, gently lower the spindle and very lightly dimple a small dot in the Dykem. Then it was easy to see if I needed to move the table slightly to get the dimple directly over the cross scribes.

-Trout

bp:
A couple of months ago I got an imported centering 'scope from Enco in the US, it was "on special", I happened to notice the other day that the same thing was still on sale, something like US$190 plus freight which wasn't too bad to Australia. I've used it a huge amount since, not only for centering on the mill, but also for getting lathe tools absolutely spot on center height. As it happens I've just finished making an engine mounting plate, which had 12 accurate holes marked out with a height gauge and they are all spot on.
No doubt others will decry them, but as far as I'm concerned it was one of the best bits of kit that I've got, and not just single function!!
cheers
bp

picclock:
@JasonB

OK now I understand. I never realised that in clockmaking you adjusted the hole distance to get the gear fit. Also I had never heard of a depthing gauge - which seems like the ultimate in bodging it. Having said that its been done this way for many years so it's obviously the method to use.

Needless to say I have never attempted to make a clock .. .

picclock

John Hill:
If I understand correctly the function of the depthing gauge is to accurately determine the required distance between two pivot points?

So, my suggestion, figure out some way of accurately measuring the setting of your depthing gauge, maybe micrometer across the two shafts minus the diameter of one shaft. Armed with that information you can move your mill using the DRO. :scratch:

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