This video demonstrates the parts, setup, features and usage of the Surface Grinder Attachment (SGA) for belt grinders from Beaumont Metal Works. Multiple applications of Beaumont's Surface Grinder Attachment in this video show the SGA components, assembly and mounting, how to dress the abrasive belt, how to dress the magnetic chuck, and how to install magnets in the SGA chuck, and how to install or adjust the dial indicator on the Surface Grinder Attachment for more accurate depth and thickness measurements. Specific tasks are narrated and presented including how to grind specific thicknesses of steel within 0.001"; the importance of adjusting the SGA knob before pulling the chuck across the abrasive belt; removing scales after heat treatment of steel; improving flatness of blades, knives or other workpieces; using roll pins for extra holding power on the magnetic chuck; and dealing with delicate or non-magnetic workpieces such as brass, wood or aluminum which require finishing with the SGA. Large damascus blocks of steel are shown in the video to be surface finished, squarely ground or otherwise trued up with the Surface Grinder Attachment. Blocks of steel damascus 1"x1", 2"x2" or even 2"x4" with a length up to 12" can fit on the 2.375" by 12" magnetic chuck for use with this Surface Grinder Attachment. Odd shapes are ground with Beaumont's Surface Grinder Attachment in this video, and a full symmetric taper is created using the built-in sine bar. As illustrated by this video, the sine bar double pin feature of the SGA may be useful for easily and exactly tapering knife tangs or finishing tapered tangs of knives with more speed, control, flatness and repeatability than has been possible with KMG and KMG-TX belt grinders without surface grinding capabilities. The video demonstrates surface grinder applications with both the special purpose, tri-helix high-performance surface grinding wheel from Beaumont Metal Works, and also a popular and more common 10 inch contact wheel. The Surface Grinder Attachment (SGA) works with the classic KMG and the KMG-TX belt grinders from Beaumont Metal Works, and can also be used with other 2x72 belt grinders which use 1-1/2" square tool arms. The video shows usage of the Surface Grinder Attachment in vertical mode for use on either the KMG grinder or the KMG-TX, and also usage in the horizontal mode on the KMG-TX belt grinder.
In the video, the Y-axis direction runs through the main body of the Surface Grinder Attachment and indicates the distance between the magnetic chuck and the abrasive belt. To accommodate thick or wide pieces of steel or to allow use of different surface grinding contact wheels, large changes in the Y-axis can be made by moving the controls and X-axis anchor into any of the nine different positions available on the main body of the SGA. Small adjustments to the Y-axis are made by turning the knurled, large comfort-grip SGA control knob. Turning the SGA control knob counter-clockwise moves the magnetic chuck closer to the abrasive belt. Turning the SGA control knob clockwise moves the magnetic chuck further away from the abrasive belt. The dial indicator is mounted on the main body of the Surface Grinder Attachment to measure small changes in the Y-axis. Travel distance of the dial indicator can be changed with the adjustable 2” long cup point stud included on the body of Beaumont’s Surface Grinder Attachment.
The X-axis direction of the SGA runs along the sliding arm and along the length of the magnetic chuck. The operator moves the magnetic chuck in the X-axis by holding the smooth aluminum handle of the arm and then manually pushing and pulling to move the arm and the chuck across the rotating abrasive belt for surface grinding.
For some grinding operations and when preparing or dressing the magnetic chuck for use, it is necessary to make adjustments in the Z-axis. The Z-axis is perpendicular to both the X-axis and Y-axis. The Z-axis direction is parallel with the center spindle of the surface grinding contact wheel and also the width of the magnetic chuck. As shown in the video, the operator uses the tracking control of the grinder to move the abrasive belt in the Z-axis from side-to-side across the width of the magnetic chuck.
Thank you for viewing this demonstration video of the Surface Grinder Attachment from Beaumont Metal Works.