OSHA 1926.1153, Section XI

AG Cutting Submittal

HILTI ANGLE GRINDERS WITH A CONCRETE CUTTING HOOD

Presentation

Hilti developed various angle grinders for mortar removal and other cutting applications. When configured with the correct guard/

hood and connected to the approriate vacuum, these tools are compliant with OSHA 1926.1153 Table 1 (xi) “handheld grinders

for mortar removal (i.e., tuckpointing)” or (xii)”handheld grinders for uses other than mortar removal” (note Hilti interprets the DCH

230/300 to be a “handheld grinder”). For Table 1 compliance, the vacuum cleaner must have at least 25 cfm per inch of the wheel

diameter, a filter cleaning mechanism, and a filter efficiency of at least 99%.

Set-up

1. When cutting mineral materials, use a suitable vacuum cleaner (eg. Hilti VC 300) with the corresponding filter

2. Attach the guard/hood/depth gauge (see submittal package for appropriate item number) to the tool with the desired depth of

cut. Always keep the depth gauge in full contact with the base material when cutting

3. Connect vacuum cleaner hose to respective opening in grinder blade guard

4. Connect the tool to a suitable electric power source

5. Adjust the depth/ cut in steps of max. 40-50mm

6. Switch vacuum cleaner on first then switch grinder on and start cutting

7. If setup properly, the blade will rotate toward the vacuum collection port. The end of the guard with the vacuum port must

always be placed against the concrete first. Always pull or push the tool in the direction of the vacuum port.

8. Verify proper operation => Check for damage or leakage at tool, hose to connection of both. Ensure tool disc guard and

exhaust port are free of obstruction.

9. When cut is finished, release trigger of tool and allow to stop before removing from cut

10. Keep vacuum running until cutting is completed

11. The following will increase dust exposure — minimize these activities:

• through cutting

• cutting past the end of the base material

• making multiple passes for a cut

• pulling/pushing the tool in a direction opposite the vacuum port

• attempting to angle the disc at other than a perpendicular cut into the base material

Application

• Electric powered angle grinders/cutters for the construction industry

• Design to for cutting mineral material with Diamond blades without use of water

• With synthetic resin-bonded fibre-reinforced abrasive disc discs the tools could be also used to cut metal (not connected to

vacuum cleaner)