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7th January 2019, 10:58 AM #1Member
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Fitting a Woodcut CBN wheel to an Abbott & Ashby grinder
I bought the 200 mm Abbott & Ashby bench grinder and a CBN wheel (Woodcut from CWS).
The grinder is really good.
But the CBN wheel does not fit, or rather it fits, but you cannot lock it. It looks like it needs a spacer. Or am I missing something.
Regards,
Christophe
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7th January 2019 10:58 AM # ADSGoogle Adsense Advertisement
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7th January 2019, 12:30 PM #2
Do you mean that the shaft isn't threaded the whole way so you can't tighten the nut enough without adding a spacer?
Or a spacer to shift the wheel over a bit so it doesn't rub against the guard?
Or do you mean a sleeve? ie. the CBN has a larger bore than the shaft dia?
Or something different again?
Do you have pix?
- Andy Mc
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7th January 2019, 01:10 PM #3Member
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No1 is the correct answer.
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7th January 2019, 01:36 PM #4
By how much?
Just a few mm? A cm?
Is the width of the hub of the CBN the same as that of the normal stone? If so, you'll need to also use the domed washers... if you're not already doing so. (They're also spacers that are included in the calculation of the grinder's wheel-width rating. Not the wheels. )
You should be able to put them on backwards (cupping the nut instead of the wheel) if, because of the wheel moulding, they don't fit the correct way around. On a metal wheel they're probably better used that way anyway,
If they're already on, then that's odd. What width (not diameter) wheel is the CBN? It's hub width is the same? What width wheel is your A&A rated for?
If they're mismatched an appropriately sized spacer is the way I'd go IF I couldn't exchange the wheel for a wider one for some reason, such as a wider wheel would foul the guard.
- Andy Mc
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7th January 2019, 04:38 PM #5
Have you removed the guards? They are unnecessary with CBN wheels - there is nil risk of a wheel coming apart, as with vitreous wheels. The guards take up about 25mm of shaft length. There is sufficient space for a 1 1/2" wide wheel with the guard off.
Regards from Perth
DerekVisit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.
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8th January 2019, 10:43 AM #6
What Derek said - CBN wheels should fit most common grinders provided the shaft diameter is correct.
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8th January 2019, 04:59 PM #7Member
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OK. A few pics hopefully will help.
IMG_0261.jpg
IMG_0262.jpg
2 above are of the wheel that came with the grinder.
IMG_0263.jpg
Now, the CBN wheel is not full but has a large recess, which is why the nut cannot lock it, the left washer is causing the problem.
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8th January 2019, 05:25 PM #8
Remove the guard completely. It is no longer necessary.
Older photo with my early wheels ...
link: http://www.inthewoodshop.com/Woodwor...ningSetUp.html
Regards from Perth
DerekVisit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.
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8th January 2019, 08:24 PM #9GOLD MEMBER
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Have you spoken to CWS about it?
I’m sure this is not a new problem for them.
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8th January 2019, 09:57 PM #10
Not open until next Wednesday
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8th January 2019, 10:30 PM #11GOLD MEMBER
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I had the same issue with my Woodcut CBN wheel from CWS. I just needed to use spacers so the locking nut would engage the wheel. I've used both the standard grinder washers, plus some really thick flat washers from Bunnings. I forget what the washers are called, but they have a specific purpose. They either had a 5/8" or 3/4" bore. It wasn't a neat solution, but it was a solution and works fine for me. You don't need to use the standard grinder flanges/washers, but they all add to the space I am trying to fill and by using them, I know where they are if I want to sell the grinder and keep the CBN..
Keep the guards on. All unused portions of blades, cutters, wheels should be guarded as close as practicable. You can see a small snippet of the mess on my sharpening/dumping bench which can easily get wrapped up in the 'flywheel' spinning at 2800rpm which takes about 10 minutes to spin down to zero rpm.
SAM_0084.jpgSAM_0086.jpg
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9th January 2019, 12:43 AM #12SENIOR MEMBER
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9th January 2019, 12:54 AM #13
Colin, the rests on these bench grinders are junk. They make the task harder. The guards obstruct the spindle and reduce its length. With it out of the way, you can see where you need to add washers and secure the wheel.
Regards from Perth
DerekVisit www.inthewoodshop.com for tutorials on constructing handtools, handtool reviews, and my trials and tribulations with furniture builds.
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9th January 2019, 06:46 AM #14
The tool rests may be junk however the wheel guards serve a very useful purpose and must remain fitted to bench grinders fitted with friable and/or "solid" wheels.
Bench grinders present several hazards,
- Heat - Hot metal & Sparks.
- Noise -
- Vibration - out of balance wheels, shafts etc.
- Contact injuries - friction burns, sharp edges and burrs.
- Entanglement - Hair/clothing getting caught in moving machine parts (wheels, shafts), which is exacerbated due to the additional momentum and the ‘run on’ effect of CBN wheels after switching off.
- Flying Objects - Eye injuries from high speed "grinding" particles, friable wheel disintegration, other objects in the proximity of the grinder coming into contact with wheels.
- Gravitational hazards - objects falling off overhead shelving onto unguarded wheels. (vibration)
It is true that some hazards are "engineered out" with the use of "solid" wheels on bench grinders e.g. friable wheel disintegration. However the other hazards whilst they may be reduced e.g. excessive vibration, they still exist, and are likely to occur so action must be taken to eliminate or reduce the risk of injury. Wheel guards are proven to do this very effectively & cheaply! Good housekeeping practices also reduce risk from many potential hazards.
Vibration may well be almost non-existent with well manufactured "solid" wheels but many bench grinders have one CBN and one "friable" wheel fitted - therefore the vibration hazards remain due to the "friable" wheel fitted..
In a workplace or community workshop the guarding must remain fitted! Removing them would be considered negligence.Last edited by Mobyturns; 9th January 2019 at 06:55 AM. Reason: formatting
Mobyturns
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