Page 84 - HOLE_MAKING_CATALOG_INCH_2022_P237-P372

DEEP DRILLING - BTA SYSTEM
SHIM GPS
Shims for GPS Pads
W1

OAL

Designation W1 OAL
SHIMSET-GP04 .157 .626
SHIMSET-GP05 .197 .709
SHIMSET-GP06 .236 .787
• 5 shim set contains 5 shims in thicknesses of .0004", .0008", .0012", .0016" and .002" respectively • Adjusting shims are sold by set only, and are not to be sold separately
Shim Combinations for Various Diameters
Diameter Adjustmemts (inch) Shim(s) for Measuring Guide Pad Shim(s) for Supporting Guide Pad Number of Shim Sets Needed
+.000393 .000393 .000393 2
+.000787 .000787 .000787 2
+.001181 .001181 .000393+ .000787 1
+.001575 .001575 .000393+ .001181 1
+ .001969 .001969 .000787+ .001181 1
+.002362 .000393+ .001969 .000787+ .001575 1
+.002756 .000787+ .001969 .001181+ .001575 1
+0.003150 .001181+ .001969 .001575+ .001575 2
+.003544 .001575+ .001969 .001575+.001969 2
+.003938 .001969+ .001969 .001575+ .001575+.000787 2

Assembly Instructions
STEP 1 STEP 4
Measure the DTD drill diameter between the Install the adjusting shims underneath the guide pads,
measuring guide pad and the insert cutting edge. respectively. Put the guide pads back on the tool.
If a presetter is not available, use a micrometer or caliper. For Place the adjusting
a precise drill diameter measurement, it is recommended shims under the
to test-drill a hole and measure the hole diameter. .000787” guide pads
.000393”
2 shims to make
.001181” thickness

STEP 5
STEP 2 Measure the drill diameter again to confirm that
Select the shim combinations according to the the required diameter is obtained on the DTD.
chart above to obtain the required hole diameter.
Take into consideration that the actual diameter of the drilled hole
tends to be slightly larger
(usually +787.40 μin to + 1181.10 μin) than the drill’s nominal
diameter — i.e. add 787.40 μin -1181.10 μin to the measured
drill diameter in Step 1 above before the final drill diameter.

STEP 6
Drill a hole to confirm that the required hole
diameter is achieved.

STEP 3
Remove the guide pads.

320 ISCAR