michiganbuck
Diamond
- Joined
- Jun 28, 2012
- Location
- Mt Clemens, Michigan 48035
Recent web browsing cold saw sharpening machines I saw quite a number of such machines being used with not using a blotter with a vitrified wheel. Vitrified wheels are abrasive grits welded together with melted glass or clay…Abrasive grits are irregular shaped and wheel sides are never exactly flat. The blotter allows tightening a wheel with little chance of a grit edge cracking the wheel. Such a cracked wheel is likely to Blow Up at high RPM. With these machines one may have one's face right in line with the blow-up wheel.
That a wheel might come new with no blotter, or if a manufacturer does not state to use a blotter is no excuse not to use one. Their use is the law in the USA and Canada. "I didn't know" is not a valid excuse for an employer ..it is your responsibility to know. Yes if you can't find the one you need, one can make them with heavy card paper like of a cereal box.
USA
(6) Blotters.
(i) Blotters (compressible washers) shall always be used between flanges and abrasive wheel surfaces to insure uniform distribution of flange pressure. (See paragraph (d)(5) of this section.)
Canada OSHA
Wheel Mounting on Portable Grinders : OSH Answers
That a wheel might come new with no blotter, or if a manufacturer does not state to use a blotter is no excuse not to use one. Their use is the law in the USA and Canada. "I didn't know" is not a valid excuse for an employer ..it is your responsibility to know. Yes if you can't find the one you need, one can make them with heavy card paper like of a cereal box.
USA
(6) Blotters.
(i) Blotters (compressible washers) shall always be used between flanges and abrasive wheel surfaces to insure uniform distribution of flange pressure. (See paragraph (d)(5) of this section.)
Canada OSHA
Wheel Mounting on Portable Grinders : OSH Answers