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Grinding wheel blotters
- Thread starter Chris152
- Start date
Lurker
Old Oak
Either the same thing or the blotter is under the label.
Everything you might need to know is here….
www.hse.gov.uk
Everything you might need to know is here….
Safety in the use of abrasive wheels - HSE
Guidance subsequent to the repeal of the Abrasive Wheels Regulations 1970
Thanks Lurker.Either the same thing or the blotter is under the label.
Everything you might need to know is here….
Safety in the use of abrasive wheels - HSE
Guidance subsequent to the repeal of the Abrasive Wheels Regulations 1970
Good link, thanks Lurker but I am none the wiser as to a what or why a blotter. Is it like an ink blotter to soak up any blood ?
Dr.Al
Old Oak
It's a bit of a weird name, but it's something to spread the load of the clamping washers on the wheel. From Lurker's link:
Thanks all, it's nicely on there now. Tho to tighten the nut I had to use an impact driver on the lowest setting, having spent far too long trying to tighten one nut without the opposite end loosening - again, I searched online for guidance and it seems some have a recess for an allen key in the shaft end to stop this happening, but ours hasn't.
The stone has about 1mm wobble side-to-side as it rotates - the shaft is straight and the spacers seem flat, so I think it's the stone. It's only going to be used for sharpening tungsten electrodes for tig welding, so delicate use - is that much wobble an issue? It runs smoothly in spite of this. The face is now dressed and clean, and the lad made a cover for that side in case of disaster (we bought it used and it had no covers).
The stone has about 1mm wobble side-to-side as it rotates - the shaft is straight and the spacers seem flat, so I think it's the stone. It's only going to be used for sharpening tungsten electrodes for tig welding, so delicate use - is that much wobble an issue? It runs smoothly in spite of this. The face is now dressed and clean, and the lad made a cover for that side in case of disaster (we bought it used and it had no covers).
Steve Maskery
Old Oak
A grinding wheel story:
My granddad was a pattern-maker. He was also a little fella. In those days men wore a shirt and collar to work and a cap. I never saw my granddad outside the house without a cap or a trilby. Even if it was just down to the greenhouse.
One day, he was sharpening a tool at a grinder in the workshop, when the wheel itself shattered. My guess is that it was a natural stone, not a man-made composite like we have today. Of course, safety glasses were never heard of.
A piece of shrapnel went over his head and slit his cap. He always said that had he been an inch taller, or indeed if it had been anyone else in the shop, he would have had it right between the eyes.
S
My granddad was a pattern-maker. He was also a little fella. In those days men wore a shirt and collar to work and a cap. I never saw my granddad outside the house without a cap or a trilby. Even if it was just down to the greenhouse.
One day, he was sharpening a tool at a grinder in the workshop, when the wheel itself shattered. My guess is that it was a natural stone, not a man-made composite like we have today. Of course, safety glasses were never heard of.
A piece of shrapnel went over his head and slit his cap. He always said that had he been an inch taller, or indeed if it had been anyone else in the shop, he would have had it right between the eyes.
S
Lurker
Old Oak
Chris, you shouldn’t need to tighten the nut beyond hand tight. The shaft rotation should keep it tight enough. Assume there are flanges either side of the stone? These should be slightly cupped.
Slight wobble can sometimes be eliminated by 90 degree shift of the stone vs the shaft.
Have a read of pages 17- 20 of the document, it’s a bit detailed because it covers a wide range of machines but the general gist is the same for all.
Slight wobble can sometimes be eliminated by 90 degree shift of the stone vs the shaft.
Have a read of pages 17- 20 of the document, it’s a bit detailed because it covers a wide range of machines but the general gist is the same for all.
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'60 Where the wheel is clamped by means of a single central nut, the nut should be tightened only enough to ensure that the flanges drive the wheel and prevent slip.
61 Where a tightening torque is recommended by the machine manufacturer a torque wrench should be used. Otherwise tightening should be done only by hand pressure on a spanner.'
That's great - thank you. I'll remove the stone again and check I haven't done any damage by over-tightening (tap and check for ring) and re-do as you say.
I did find a video of the nuts self-tightening when the grinder started, which I guess means they really can't come off under normal use:
Lurker
Old Oak
Bear in mind the document covers wheels with a 3ft radius.
Bursting wheels can be catastrophic, I know of an ex policemen who had a workshop as a hobby who was blinded by a shattered wheel.
Was a common occurrence pre engineering decline in the U.K., hence the regs.
Bursting wheels can be catastrophic, I know of an ex policemen who had a workshop as a hobby who was blinded by a shattered wheel.
Was a common occurrence pre engineering decline in the U.K., hence the regs.
OK, I've tried rotating the stone relative to the shaft and it's not making a real difference. So I checked the bush again, and it's about .3mm difference in height, one side compared to the other (photo). Would this be enough to cause the wobble at the edge of the stone?
As I write this, I wonder if I should be making sure to rotate the stone relative to the bush to help eliminate wobble? I have a feeling the bush may have been turning with the stone when I repositioned the stone relative to the spindle. I checked the spindle and it's true.
As I write this, I wonder if I should be making sure to rotate the stone relative to the bush to help eliminate wobble? I have a feeling the bush may have been turning with the stone when I repositioned the stone relative to the spindle. I checked the spindle and it's true.
Lurker
Old Oak
Is that the bush and one flange? Are they one item?
I would expect the bush width to be a tad less than the wheel width.
Show us your flanges (no laughing at the back!)
I would expect the bush width to be a tad less than the wheel width.
Show us your flanges (no laughing at the back!)
It's back on the grinder now! In the photo is one part that sits on the motor side of the spindle and through the stone; the other side is just a flat bush/ flange.
Still getting wobble, currently thinking about getting a cheap CBN wheel instead!
Still getting wobble, currently thinking about getting a cheap CBN wheel instead!
Looking at the picture of the flange is the white patches old paper blotter stuck to it if so then make sure it is fully cleaned off as that may cause a very slight wobble as well as not give a correct reading when measuring. Also make sure the outer edge is also clean