Multiquip DFG Series manual Tungsten Carbide Grinding Block, Scarifier Blocks

ASSEMBLY INSTRUCTIONS/OPERATIONS

a) The C06 and C10 coarse grade stones are the most popular utilized stones and result in maximum material removal rates. They are utilized for general grinding and the removal of trowel marks, high spots and rough sections on concrete surfaces. The average service life is approximately 4 to 10 hours.

b)The C24 medium grade stone will result in lower material removal rates. It is utilized for finer finish grinding of concrete and rough grinding on terrazzo and other types of stone floor configurations. The average service life is approximately 6 to 10 hours.

c)The C80 fine grade stone will result in still lower material removal rates. It is utilized for polishing concrete and medium grinding on terrazzo and other types of stone floor configurations with a water/slurry mixture only. The average service life is approximately 8 to 20 hours.

d)The C120 super fine grade stone will result in the lowest material removal rates. It is utilized for final polishing on terrazzo and other types of stone floor configurations with a water/slurry mixture only. The average service life is approximately 40 to 75 hours.

Tungsten Carbide Grinding Block

This multi-accessory attachment is most often utilized on larger concrete grinding projects where increased production and service life are required. The block utilizes tungsten carbide balls approximately 1/16 inch diameter that are deposited in a molten matrix material during the manufacturing process at a controlled rate. The end effect is a multi layer deposit of tungsten carbide balls in the matrix material. As the softer matrix material wears with use, it exposes a new layer of fresh tungsten carbide balls to continue the grinding process. The tungsten carbide grinding block is considerably more aggressive than the C10 silicon carbide grinding stone. With the ability to renew itself during usage, the normal life expectancy for this accessory can approach several hundred hours. The nominal dimensions for the tungsten carbide grinding block is 2" x 2" x 4" and is secured to the machine with a plastic wedge. FIGURE 5.

FIGURE 5

Scarifier Blocks

These multi-accessory attachments are comprised of flails and spacer washers secured in a rigid steel case. FIGURE 6. Rotation of the two multi-accessory discs causes the flails to impact against the work surface with a variety of results. Scarifier blocks are secured to the machine with plastic wedges.

Several factors directly affect the selection of a flail design for a specific job application:

a) The type and amount of material to be removed from the work surface. Materials of higher yield and tensile strengths along with the actual volume of material to be removed will generally be the first factors under consideration.

b)Purchase cost versus service life. The original purchase cost of plain, heat-treated steel flails must be compared against the substantially higher costs of the tungsten carbide insert flails. In turn, these costs must be compared to anticipated service life. All flails will eventually wear to the point of requiring replacement. The amount of unproductive time spent to replace worn flails on a job can be substantially greater than the actual replacement cost of many flails. It then becomes a balance between purchase cost, productivity, service life and labor cost.

c)Surface finish and texture. The finest grained surface finish available from the scarifying process is comparable to a "swept or broomed" like finish. If a smooth, flat finish is desired, the scarifying process must be followed with a grinding or polishing type process. Many job requirements may call for large amounts of material to be removed, but followed with additional specifications requiring a finer surface finish or texture. Many times these jobs dictate the use of an aggressive flail configuration because of productivity and cost considerations. Less aggressive flail configurations can then be

DFG-SERIES SURFACE GRINDERS OPERATION AND PARTS MANUAL REV #4 (05/28/09) PAGE 19