Straight up, back or anywhere is fine. Bottom of a 3/16 bar would be .1875 below and the top would be .1875 above. Then rotate the outside tool 

10/23 · This clearance allows the nose radius to be the main point of contact between the tool and the workpiece. Increasing the end cutting edge angle in the positive direction

Item Indexable Boring Bar; Insert Shape 55 Degrees Diamond; Insert Clearance Angle 0 Degrees; Overall Length 12 in; Shank Dia. 1 in Coolant Fed Coolant Through; Number of Inserts 1; ANSI Code A16T-DDUNL4; Approach Angle 93 Degrees; Center to Cutting Tip 3/4 in; Compatible Hardware AP304-DN15 Shim, FS1461 Screw, FS1465 Torx Key, FS1470 Pressure Spring, FS1473 Clamp Screw, PK241 Clamp, RS117 Pin

3/4" Shank Set - Suits 3" Boring Heads: Normally $164.95 a set · Total length of boring bars: 70mm 80mm 90mm 100mm · 1 Bar will take TCMT21.5 Inserts · Remaining 3 

This is a clearance item and price is limited to stock on hand at our warehouse. Does not include factory stock. All clearance items are non-returnable.

Choose from our selection of boring bars, including lathe tools, indexable lathe tools, and more. In stock and ready to ship. Instead of widening a hole using a lathe, which turns the workpiece while the cutting tool stays still, use these holders to turn your boring bar in a milling machine and keep the workpiece stationary.

Carboloy S16-PTFPR-2.5 boring bar with 1" shank. The shank has been cut short, giving a new over-all length of around 8.25". Part of the boring bar has been ground away to give more clearance. The bar looks to be in good working condition.

Technical Specs Item Indexable Boring Bar Insert Style CNM Insert Shape 80 Degrees Diamond Insert Clearance Angle 0 Degrees Overall Length 14 in Shank Dia. 1-1/2 in Number of Inserts 1 ANSI Code S24U-MCLNR-4 Center to Cutting Tip 57/64 in Compatible Hardware CL-20 Clamp, ICSN-433 Seat, NL-46 Lock Pin, S-46 Optional Seat Screw, XNS-48 Clamp Screw

6/22 · The OD of the bar itself should be on center. Rotate the bar until the insert cutting tip is on center. The insert top face will now be negative and the heel clear should be correct. Where you went wrong was setting the insert top face flat since you had no orient flat on the bar and flat to the world makes the most logical sense.

Ensure correct radius of insert. 13.1. Visually inspect for good seating. Ensure there are no gaps between the pocket and the insert base. If unsure use a piece of shim to check for any clearances, if you cannot seat the insert, check for debris in the pocket or on the base of the insert, clean and repeat check. 13.2.

Clearance between the boring bar and the inside of the bore is extremely important for chip evacuation and to avoid radial deflection. For a bore diameter of