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New 3/8" tm-375 c/t thread mill
For Sale: New 3/8" tm-375 c/t thread mill
Subject New 3/8" tm-375 c/t thread mill
Ad is submitted by poster:
* Designed for milling precision inside diameter and outside diameter Threads in all types of steels, non-ferrous and exotic materials.
* Equally effective in laminated plastics, fiberglass and composites used in the aircraft industry.
* Thread form generated is 60 deg. American standard I.D and O.D. threads.
SUGGESTED RANGE : 12-32 T.P.I.
THESE THREAD MILLS CUT A RANGE OF STANDARD THREAD SIZES THAT IS DETERMINED BY THE MAXIMUM, MINIMUM PITCH AND THE DIAMETER OF THE CUTTER. METRIC AS WELL AS CUSTOM THREADS ARE ALSO POSSIBLE WITH THESE THREAD CUTTERS.
Due to the circular motion of the cutter as it forms a thread the actual feed rate at the cutting edge will be different from that which is programmed at the center of the tool. Straight line milling is a straightforward calculation. Feed (F) = Rotations Per Minute (RPM) X Number of Flutes X Chipload Per Tooth. For an internal thread the feed rate at the edge actually increases as the cutter diameter increases. For an external thread the feed rate at the edge decreases as the cutter diameter increases. This can be shown as a direct relation between the size of the circle the cutter moves within. There is a formula used to calculate this and basically we calculate what the actual feed rate is at the cutting edge in order to tell the machine at what feed rate we want the centerline of the spindle to move. So, once we calculate what chipload and feed rate we want - based in a straight line - we mathematically determine the feedrate to program the machine - because it really doesn't know what you are doing. The formula is as follows...
Feed Rate to Be Programmed = Actual Feed Rate X (Diameter of the Work - Diameter of the Cutter) / Diameter of the Work.
Feed Rate to Be Programmed = Actual Feed Rate X (Diameter of the Work + Diameter of the Cutter) / Diameter of the Work.
Internal Threads (climb milling)
The simplest method to produce a thread form using an CMTech Tools Thread Mill is as follows:
1. With the center of the hole being the X-Y zero point, move the cutter to the center of the hole, then to the thread depth required.
2. Move the cutter over a small distance (usually about .02" towards the three-o'clock position) to call up your cutter compensation.
3. Machine in a counter-clockwise (climb milling) direction generating a 1/2 circle and ending at the full thread depth at the nine-o'clock position. Simultaneously move 1/2 pitch in the Z direction. The direction of the Z movement will determine the handedness of the thread.
4. Produce your thread by generating 1 full circle (counter-clockwise) around the center, while moving 1 full pitch in the Z direction.
5. After the full form has been machined, return to your starting position near the center of the hole. This is done by generating another 1/2 circle (counter-clockwise) combined with 1/2 pitch move in the Z direction.
6. Return to your hole center, and exit the hole
Recommended Cutting Conditions
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Posted By: Allyson Workman
Contact: Allysonworkman@repair--parts.com (Allyson Workman) (this is a temporary forwarding address).
