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#1.2512 2b thread form tap manual#
#1.2512 2b thread form tap android#
#1.2512 2b thread form tap code#

* Permisable values for thread Class 3A # Description Value (Inch) Value (mm) es Allowance 0 (Ref) 0 (Ref) d Major Diameter 0.5533 - 0.562 14.054 - 14.275 d 2 Pitch Diameter 0.5227 - 0.5259 13.277 - 13.358 d 3 Minor Diameter For calculations of different engagement length use the Thread Calculator * Values are calculated for Length of engagement of 5xPitch.

#1.2512 2b thread form tap android#

Jim has also worked as a freelance developer, creating the Machinist Journeyman, an iphone and android app, and the Machine Shop Calculator, a Casio based calculator.* Permisable values for thread Class 2A # Description Value (Inch) Value (mm) es Allowance 0.0013 (Ref) 0.033 (Ref) d Major Diameter 0.552 - 0.5607 14.021 - 14.242 d 2 Pitch Diameter 0.5204 - 0.5246 13.218 - 13.325 d 3 Minor Diameter

#1.2512 2b thread form tap manual#

Jim has over 20 years of shop experience working as a manual machinist, CNC programmer, and setup and machine operations, with 18 years of cutting tool sales from a technical aspect. Jim Rowe is currently a Regional Sales Manager for Arch Global Precision, covering Indiana, Ohio and Kentucky. This produces a quality thread more consistently and achieves the best tool life possible. This thin web will produce a fine, smooth point for the miniature drill to make contact with, thus penetrating straight for a nice quality hole for the miniature tap to follow. A miniature spot drill will have a thinner web than larger spot drills. Now, let’s go all the way back to the spot drill again. In the smaller thread ranges (1/4” threads and smaller) the actual difference in diameters between the correct and incorrect percentages are minimal. If a no-go thread gage is something you’re fighting on a regular basis on 9/16-18 and 5/8-18 threads you can see the problem there too. If you review the thread sizes you have the most trouble with and notice they are ¼”-28, 3/8”-24, ½”-13 and 5/8”-11 threads you can now see why.

Red: Greater than 3%, Small or Tight Fit … Might gage incorrectly, will be difficult to tapĪs seen in the Far Right column, “Closest MM Drill,” by utilizing metric drill diameters you will be able to go between basic inch drill sizes to achieve the 75% target for inch cut taps.

Pink: Greater than 3%, Large or Loose Fit … Might gage incorrectly, should tap easily.

Yellow: +/- 2% to 3% of the Target … Could cause issues, especially on the tight side.

Green: +/- 1% of the Target … Should be fine.

#1.2512 2b thread form tap code#

The color code of Green/Yellow/Pink/Red means the following: The column titled “Drill Chart Percentage” is the actual percentage when the suggested diameters are calculated for each thread size.Įach of those percentages has an associated color code. The drill chart I used suggests the drills in the column titled “Drill Chart Drill Choice”. But WAIT !!! Did you calculate the TRUE HOLE SIZE by the suggested effective diameter percentage? Did you assume the recommended drill size will provide the correct percentage? This might be why you have reoccurring issues in certain thread sizes you tap.īelow is a chart I created that shows a range of some popular fine and coarse “inch cut tap” specifications. So you pull out your favorite drill company’s decimal equivalent/metric conversion/ tap drill chart and by their guidance, you use the tap drill they recommend for the thread you are making. The effective thread percentage of a roll form tap is 65%.

A roll form tap requires the hole to be drilled to the pitch diameter, basically in the middle of the minor diameter and the major diameter of the thread specifications.

The effective thread percentage of a cut tap is 75%. A cut tap will require the hole to be drilled to the minor diameter of the thread specifications.How much material should be left for a tap? The amount to leave in a hole that will be tapped is based on the type of tap (cut tap or roll form tap) which have their own effective thread percentage guidelines. Obviously, the straighter the hole is the more consistent the reamer will cut as it goes into the hole, producing the diameter you expect it to. The amount to leave is based on the material being reamed in a diameter range such as 1/8” to 1/4”, 1/4” to 3/8” and so on. Manufacturers of reamers will suggest how much material to leave for the reamer to cut properly. There, I mentioned subsequent tools (taps and reamers) that enter the hole created by the drill and the typical issues these tools will run into if the hole isn’t straight. This article is a fitting follow-up to the previous one, the topic of which was utilizing the proper spot drill in order to cut a straight hole.

By Jim Rowe with Arch Global Precision, a Neill-LaVielle valued supplier