Expanding Loc-down Bolt 12098
Installation
Preparation of fixture
- Drill and tap M12 x 1.75 flat bottom hole to a depth of "a", and countersink 0.8mm x 90°. Thread should be a minimum of 3.8mm from bottom of hole.
- Note height bolt head will protrude above fixture surface when clamped, dimension "b" - to avoid any tooling interference.
- Dimension "c" is the height at which Loc-down Bolt balls will clamp on workpiece. See "Fixture preparation" chart below.
Fixture Preparation
| Dimensions | mm |
| a | 21,59 |
| b | 16,76 |
| c | 4,06 |
| d | M12, CS to 0,8 x 90o |
| ball dia. | 4,75 |
Preparation of workpiece option 1
- Drill 12.7mm through hole, dimension "f".
- Using endmill cutter, 12098.W0530 (please order separately), generate .625" dia circle. Tip of cutter should be 10.41mm below top finished surface of part. Please refer to table of endmill cutter starting feeds and speeds for different materials.
- Countersink 0.8mm x 90°. See "direct workpiece without bushing preparation" chart below.
Direct workpiece without bushing
| Dimension | mm |
| e | 15,88 |
| f | 12,7 - 13,03, CS to 0.8 x 90o |
| g | 10,41 |
Endmill cutter starting feeds and speeds
| Material | Feed | Speed |
| Aluminium | 25 IPM | 3000 rpm/1 radial pass |
| Hard metals | 1 IPM | 1,200 rpm/3 equal radial passes |
Preparation of workpiece option 2
- Drill 12.7mm through workpiece. Deep countersink hole of diameter "a", leaving 1.57/2.39mm of material on bottom (i.e. mounting) surface of workpiece.
- Install loc-down bushing 12098.W0525 (please order separately), ensuring bottom of bushing is flush with base of counter sink hole.
- On deep holes, consider counter bore for dimension "a" for easier bushing installation.
- This is a press fit installation, metal is displaced. The OD of the bushing is knurled to aid in retention and minimize bushing and part distortion. Using bushing installation tool 12098. W0535 (order separately) provides properly seated bushing installation, without damage to the bushing.
- Countersink 0.8mm x 90°. See "With loc-down bushing" preparation chart.
| Dimensions | mm (min/max) |
| a | Steel - 9,012/ 19,037Alu/Brass - 19,000/ 19,025 |
| b | 1,57/ 2,39 |
| c | 12,70/ 13,46 |
| d | 9,6 |
Applications
