1.
Using the calipers that were supplied with your Mill Drill machine measure the thickness
of the thumb. Simply slide the calipers up and down over the knuckle. Once you have
the setting that will gently slide up and down on the thumb mark that on your drill
sheet as the thumb hole size.
2.
Next using the calipers now slide them up and down the side of the thumb. When you
have this measurement simply note it on the side of you drill sheet.
3.
Subtract the thickness from the width and that is how much you need to add to the
hole in width. NOTE this is the total that you need to cut not the number that you
move the tables. When using movements of both X and Y it basically adds 1/3 to the
cut. In other words if you wanted to make a cut at 45degrees and add 30 thousandths
in width to the hole you would move X (which is Left or right) .021 and then you would
move Y (which is forward and back) .021 Then when you run the bit back in the
existing hole it will add .030 to the hole at 45 degrees
4.
Another example would be if found the width you needed to add to the hole was .090
we know you are only going to move the tables .060 You could move X .060 and then
Y .060 then bring the bit back into the hole and it will add .090 in width.
Section (5) Drilling Ovals
Now that you have your measurements you are ready to drill the hole. If you have
used a slug the process will begin after the thumb size has been drilled but before the top of
the slug is trimmed. You can make this cut with the excess slug there and it won’t hurt a
thing.
1.
Drill the initial thumb hole with the proper pitches in place. Do not move the jig or the
pitch tables before drilling the oval as it will compromise your accuracy.
2.
Determine if the width can be cut in one cut or multiple cuts. Remember if you make
to large of a cut it will leave crease lines in the front and back of the hole that will need
to worked out by hand
3.
45 Degree cuts are simple as they require the same movements of X and Y In other
words equal movements will create a 45 degree angle.
4.
Make you table movement for X Remember that you can reset your digital to Decimals
by pushing the mode button and it will count for you as you move the table. Also
remember you always make your cuts to the back of the hole as cutting the front will
compromise your span measurement. To check yourself simply pull the bit to the edge
REV A 12-2-05 16
