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Gagemaker’s TDWIN Taper™ software simplifies the API specifications that control connection quality. TDWIN Taper produces dimensional drawings and inspection data for API downhole tubular connections based on the most current industry standards. All the necessary details to machine, inspect and document tubular connection threads are available in one convenient program.

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Though the flutes run in opposite directions, telling an up cut from a down cut bit can be difficult if you cannot imagine their rotation in the router. Though a router always turns in the same direction, from the operators perspective, that rotation appears to reverse depending on if the router is bit down in the common hand-held mode or bit up, as when mounted in a router table.

Choosing between up and down cut router bits is one of many things in woodworking that can be frustrating until the reasoning behind the design difference is understood a little better. The number of email questions on this subject instigated this story.

Other features of the program include the ability to print thread dimension reports, providing a paper copy of any calculation. These reports provide the same critical dimensions that display in the program. A multiple calculation window capability is a feature that allows performing several different thread calculation at the same time.

Climb milling – chips are evacuated behind the cut so that you are not re-cutting them which results in a better surface finish.

The ideal situation is to have both types of spiral bits in the drawer, in the size or sizes you most often use. The quest for more tools certainly does not end with spiral router bits.

For most woodworkers, the down cut type of spiral bit is most useful, particularly for those using a router to cut dados, rabbets and visible slots. Some woodworkers like cutting mortises with a router, table mounted or hand-held. For them, the up cut bit will be most efficient.

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Up and down cut spiral bits are available in sizes ranging from ¼" to ½." We used bits from Infinity Tools for this story, both ½"-diameter. The Infinity part numbers are, up cut bit – 85-913, the down cut bit – 85-914.

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To generate critical dimensions instantly, enter basic thread information on the Thread Type Entry screen, such as: thread type, thread class, nominal diameter, and threads per inch. Once the results are computed, tabs at the bottom of the program allow selection of several types of calculated information, including dimensions and tolerances for product threads, ring gages, set plugs, plug gages or Gagemaker’s Thread Diameter gages.

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With the bit down, the rotation is clockwise. That means the side of the bit farthest from the operator is turning left to right, the near side right to left. This is very important for feed direction, as we always want the cutting edges turning against the feed direction, not with it.

When the router is oriented with the bit up, as when mounted in a router table, the side of the bit closest to the operator is turning left to right and the back side right to left. Because the wood is fed against the rotation of the cutting edges, we almost always work against the front side of the bit.

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Gagemaker develops and manufactures precision mechanical inspection equipment for the Oilfield, Mining, Water Well, and General Machining industries. Gagemaker products are used in countless facilities around the world. Gagemaker's commitment to actively developing new products along with their superb customer service has set the industry standard for almost 40 years.

Making shallow cuts to achieve the full depth needed is always important, but especially so with a down cut bit. The combination of a deep cut and a build up of chips can cause the bit to over heat and even break.

Up cut bits are very efficient at evacuating chips from the hole or slot it is cutting. This is especially important when the hole is ¼"-deep or more. Deep holes or grooves still have to be cut using multiple light cuts, but the upward direction of the flutes while rotating prevent the debris from building up in the hole and binding or even breaking the bit.

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The software displays printable drawing suitable for manufacturing. The drawings follw ASME Y14.5 standards for industry compatibility. Print gage setup and inspection reports with your company logo and work order information. The program offeres the choice to save reports and jobs for future references.

If the wood is fed into a router bit on the wrong side, the feed direction matches the bits rotation, making a dangerous kick out all but certain. Feeding the wood with rather than against bit rotation allows the cutting edges to become highly efficient feed dogs that grab the wood, accelerate it and shoot it off the table at dangerous speeds.

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If measuring internal and external shallow taper diameters is a problem, the Ball mic SET DIM Tool provides setting dimensions for ball micrometers or Gagemaker’s BX-1000 groove gage. The program calculates ball mic settings for any tapered surface geometry.

The problem with up cut bits is that the same action of the flutes that brings the chips up can also lift or fray the wood fibers around the edges of the cut. While this damage is usually minor, especially with good quality bits, it can be noticeable if those edges will be visible when the project is assembled.

This chip ejection deficiency of down cut bits is minimized by the relatively shallow cuts they most commonly are used to make. Down cut spiral bits are a good choice for cutting dados or shallow grooves, especially when the edges will be visible when the project is assembled.

The Thread Disk™ engineering software (TDWin™ ) calculates critical dimensions for threads based on ANSI tables and formulas. Thread types supported by the program include: UN, UNJ and UNR Series, Acme, Stub Acme, Stub Acme Modified I and II, Metric M & MJ, 7° X 45° Buttress, and General Purpose Pipe Threads.

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Up cut bits are frequently used for cutting mortises because of their depth. Since the edges of a mortise are eventually hidden by the shoulders of the tenon that will be fit to it, this chipping or fraying will be hidden after assembly and have no impact on the finished project.

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Down cut bits require a slightly slower feed rate. This reduced pace allows the bit a little more time to throw chips out and for them to be re cut into smaller pieces that eventually are thrown from the hole or slot.

TDWIN Taper provides easy access to information for both preferred and non-preferred Rotary Shouldered Connections, Tubing and Casing Connections, and any combination of Crossover. The program offers standard connection types and sizes. TDWIN Taper™ relies on API and industry standard tables and tolerances. It displays connection drawings, inspection gage information, and setup and inspection reports.

The downward slicing action of a down cut bit leaves a very clean, crisp edge around the hole or groove it cuts. While chips still are evacuated from the hole, a down cut bit is far less efficient in this respect than is an up cut design.