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Abrasive Wheel- where does the 1/8" rule come from?
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Posted By GavinR
Just a quick question. We have had some training completed for abrasive wheel use and mounting of wheels. There has been a conflict of info provided by 2 different trainers. The general rule appears to be that the work rest must be positioned as close a possible (safe) to the wheel at all times. However the recent training stated that a gap no more than 1/8" is the requirement. I cannot find this in the guidance so my question is where has this practice come from? From checks on the internet it appears to be common practice listed on abrasive checklists, etc.
Cheers, Gav
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Posted By Alan Nicholls
This is deemed to be the safe operating distance from the rotating wheel. As the wheel rotates from stationary to full speed in the first minute it expands due to centrifugal force, there may also be some movement in the bearings. So less than 1/8 there could be trouble as you will grind away the rest.
Anything more than 1/8 of an inch you run the risk of entrapment or work items being drawn down around the grinding wheel. It's been this way as far back as I can remember. Custom and good practice.
Regards Alan
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Posted By stephen d clarke
Hi,
HSE Guidance on Abrasive Wheels PM22 suggests the work rest if fitted should be as close as possible to the surface of the wheel, the gap never being more than 3mm (approx 1/8") and the wheel should be turned by hand to make sure it is clear all round.
Steve
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Abrasive Wheel- where does the 1/8" rule come from?
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