Busch Precision, Inc.
8200 N. Faulkner Rd. Milwaukee, WI 53224
Phone: 414.362.7300• Fax: 414.362.7319
Email: info@buschprecision.com • Website: www.buschprecision.com
Busch Precision Tooling > Aluminum / Cast Iron / Steel Precision Tooling > Straight Edges > 6800 Series Scraping Masters > Item # 6872M  


Item # 6872M, 6800 Series Scraping Masters

Cast with high quality iron, stress relieved, precision machined and hand scraped. Used in checking machine ways for flatness and angular accuracy, as well as for marking and scraping of machine ways and other 90° vee surfaces.



 Specifications 

Width
2.25 in

Length
72 in

Height
5.5 in

Weight
150 lb

Straightness Accuracy
0.0006

RMS
A roughness height rating. It is the abbreviation for root mean square and is a measure of surface roughness in terms of the arithmetic average of the squares of the variances in a given surface. (Fed. Spec. Mil. Std. 10A)

Straight Edge Accuracy
The overall accuracy of each straight edge is carefully inspected and calibrated to insure it falls within the tolerance specified. In use, straightness is dependent upon proper support points for straight edges 60" and longer. Use of these support points minimizes the deflection due to gravity.

60" 6 - 12"
72" 13 - 20"
96" 20 - 26"
120" 25 - 30"
144" 28 - 35"
168" 34 - 40"

To check the accuracy of a properly supported parallel straight edge, indicate one edge or face in the center; then turn the straight edge over and indicate the opposite edge or face in the same manner. Any gravitational deflection should be identical. By measuring the degree of deflection, proper compensation can be made in any alignment application.

To maintain precision tolerances, straight edges must be handled carefully to avoid shock damage. In storage, they should be stored with full horizontal support. Where possible, they should be hung vertically with proper safeguards.

Surface Finishes Available
Commercial
Fine
Ground
Planer

Optional Accessories
Carrying Case
Industrial Metal Cleaner