PMPA Business Trends November 2020

 

With 75 companies responding, the PMPA Business Trends Index for November came in at 125 – this is two points (1.6%) over November 2019’s 123 value.  It is down 6 points (4.5%) from October 2020. While the rate of growth slowed, it remains positive. The index is five points above the November 5-year average of 120.2.  

All sentiment indicators were positive, with Employment and Profitability outlook notably improved. Our precision machining shops- and our talented performers- continue to play a positive and essential role in the economic recovery.

 

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January 2021

Craftsman’s Cribsheet #93

Cribsheet provided by PMPA member, Pioneer Service, Inc. in Addison, Illinois

There are several surface finishing techniques that “remove or reshape the surface layer” of a precision machined component. These finishing techniques can be applied to a wide variety of materials, and provide increased durability, tighter tolerances, better aesthetics and improved functionality for many applications.

 

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Bar Straightness Calculation

 

Bar straightness tolerance varies by diameter, grade, and thermal treatment. The determination of compliance of a bar’s straightness to the applicable standard is an easily solved geometry problem. The formula for determining max allowable deviation of straightness for each tolerance class is given above each column on the first page.

The applicable standard requirements are on the second page, taken originally from ASTM A29 Table A1.24 which has now been replaced by ASTM A 108 Table A 1.4. ASTM A 108 Table A1.4 is identical to the material shown in the attached document.

 

 

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