Today I received two Drill Gauges. One metric, one imperial.
They cost £2.40 each.
The metric one has fractional size holes from 1.0mm to 13.0mm in 0.5mm steps.
On the left side there are 10 pinholes from 1.0mm to 5.5mm, running vertically.
There is sufficient distance between the holes to easily use them as a guide to eye pupil size.
The middle row 6.0mm to 9.5mm.
The right side 10.0mm to 13.0mm.
I only need the left side and maybe one in the middle row.
I will wait till night to use it on out of focus stars, but initial results with the lights off but sunshine outside the drawn curtains are encouraging.
The imperial one goes from 1/16 inch to 1/2 inch in 64ths, so quite different sizes, which may be useful.
There are 13 holes from 1/16 to 1/4 inch on the left side, so a bit closer between hole sizes.
I will check whether the holes are slightly wider than indicated, as I don't know whether a drill bit is sized or the holes that they make.
Both are stainless steel plates of a handy size.
They cost £2.40 each.
The metric one has fractional size holes from 1.0mm to 13.0mm in 0.5mm steps.
On the left side there are 10 pinholes from 1.0mm to 5.5mm, running vertically.
There is sufficient distance between the holes to easily use them as a guide to eye pupil size.
The middle row 6.0mm to 9.5mm.
The right side 10.0mm to 13.0mm.
I only need the left side and maybe one in the middle row.
I will wait till night to use it on out of focus stars, but initial results with the lights off but sunshine outside the drawn curtains are encouraging.
The imperial one goes from 1/16 inch to 1/2 inch in 64ths, so quite different sizes, which may be useful.
There are 13 holes from 1/16 to 1/4 inch on the left side, so a bit closer between hole sizes.
I will check whether the holes are slightly wider than indicated, as I don't know whether a drill bit is sized or the holes that they make.
Both are stainless steel plates of a handy size.
