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To avoid erroneous readings and unnecessary calculations, start your taper inspection from the smaller diameter, and progress towards the larger diameters. For internal threads, measure the first interval closest to the back of box. For external threads, measure the first interval closest to the pin’s nose. For example, if the reverse procedure is followed on […]
Gage weight and deflection can interfere with proper measurement. One simple step will help minimize any effect of these. When setting a gage with rod style setting standards, position the gage and standard in the orientation they will be in when inspecting the product. For example, if you are using an MRP to check a […]
On any threaded part, properly measuring thread lead is extremely important. Most of the time measuring in the middle of a connector’s thread length will show an acceptable tolerance. Inspecting at multiple locations will ensure the part is within tolerances. For best results, we measure along the same plane at the following locations: the first […]
When setting to a “flat or rod style setting standard”, the indicator should be set to zero when a minimum value is found. When setting a gage to a “round style setting standard”, the indicator should be set to zero when a maximum value is found.
Because of the combined effects of lead error, mis-matched taper, and thread form, rotary shouldered connections cut using rings and plugs will typically result in undersized pins and oversized boxes. If you wish to cut the part to spec as listed on the drawing, use the TDWIN Taper Pitch Diameter tolerances. If you want to […]
Using a thread profile on your finished part to check for burrs and debris is a well known practice. But profiles aren’t just for checking finished parts. For those using ring and plug gages, you can use the same method of sweeping the profile along the thread to check for burrs and remove debris on […]
After inspecting thread form with a profile template, we recommend inspecting for steps. For 8 and 10 round threads, use a 0.5mm lead mechanical pencil to trace along the thread form in a few locations feeling for steps on the load and stab flanks. For Buttress threads, the same procedure can be followed for the […]
Inspecting used RSC box threads with JSS Pitch Diameter gages allows for an isolated measurement of the connection size, quantifying the change in thread cone interference between the new and used conditions. This method will identify box swell or bell mouthing. Instead of measuring directly on used box threads, people often use an OD Mic […]
On used rotary shouldered connection pins, pin stretch is typically quantified in the field by only inspecting lead. The resulting lead error combined with the effect of worn threads causes pre-mature stand-off inhibiting the use of rings. Instead, use a JSS Pitch Diameter gage to directly measure the change in diameter between the allowable tolerance […]
To increase measurement accuracy and reproducibility between taper inspections on a single part, mark a guideline with a felt tip pen along the crests of the threads. Then, add a mark on the thread itself for each desired inspection interval. These lines act as a reference point for placing the taper gage’s contact points between […]