http://www.greenham.com/...ectionguides/eyewear.pdf You need to ensure that eye wear chosen complies with the EN standard BSEN166, if it does you don't need to double up. You also need to ensure suitable RA PPE is compatable PPE doesn't increase risk etc etc http://www.hse.gov.uk/pubns/indg174.pdf

You need to refer to the standards I linked too. http://www.hse.gov.uk/fo...ocs/200-299/oc282_19.htm (there is a better pdf version somewhere but i don't have time to look) If the face-mask provides a rating suitable to the velocity of the fragments ejected then protection could be deemed satisfactory - ceteris paribus of course! I wouldn't double up - but then again it all depends - if the face mask has to be removed regularly it may be prudent too.... what I would do is bring in a manufacture of face and eye protection and ask for therir advice, from this I would trial a number of options with my staff and then let them have a say in the final option - this might help with buy in and compliance too! As for the exploding discs - I assume they are well maintained and only changed by competent persons with the appropriate training? - any chance of enclosing them behind a screen? that would protect passers by and not just the operator...

Hi Linda hope this is helpful. On advice and input from engineers/fitters we moved from bench grinders to belt sanders for metal work. The same is available for portable applications, sometimes known as an electric file. Not sure if this is appropriate for the task in hand but worth a try as the outcome from a belt breaking is less severe than a disc busting. The difference between being hit with a flexible piece of paper and a solid fragment of a very hard disc. They are also more versatile in some circumstances e.g. having a long flat horizontal grinding surface can allow more abrasive to be applied to the work surface in a shorter time period. Here is an example of such a device http://solutions.3m.co.u...ications/MetalFinishing/ Kind regards Jeff

Sorry! Accidentally posted my reply within Jeffs text. Can Mods fix please???

Not quite the answer you asked but here is an extract from my training material: 9” disc on a 9” machine Speed in Miles Per Hour Circumference = 9 x Pi (3.142) = 28.28” Convert to yards = 28.28 divide by 36 (Inches in a yard) = 0.7856 Multiply by RPM = 6640 x 0.7856 = 5216.38 (Yards in a minute) Multiply by minutes in an hour = 5216.38 x 60 = 312983 (yards in an hour) Divide by yards in a mile = 312983 divide by 1760 = 177.83 MPH 9” disc on a 4 ½ “ machine Circumference = 9 x Pi (3.142) = 28.28” Convert to yards = 28.28 divide by 36 (Inches in a yard) = 0.7856 Multiply by RPM = 13500 x 0.7856 = 10605.6 (Yards in a minute) Multiply by minutes in an hour = 10605.6 x 60 = 636336 (yards in an hour) Divide by yards in a mile = 636336 divide by 1760 = 361.55 MPH