Record RPBG8 8 inch grinder review

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pe2dave

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Peterborough, Cambs, UK
I've had a whetstone grinder (10" wet wheel and 5" dry one (precursor to this perhaps? ) for some time. Bought for chisels it did the job slowly and carefully. Not quite suitable for turning tools.

Last week I bought the Record 8". Nice 8" wheel, one white one 'grey'. 40mm wide white wheel, about 1" for the grey wheel. Used it a few times and thought it worth a comment.

I'm comparing it with what I've had. A slow (speed and cut) grinder. I'm not comparing it with Creusen kit at a few hundred quid. It cost 55 pounds which puts it into the low cost kit as far as I'm concerned.

Balance. Not perfect. It has tiny rubber 'feet', which is a good job. My bench is made of morticed 6x2 timbers and it vibrated most of the stuff on it whilst getting up to speed and slowing down. Running it's capable of walking off the bench if you don't watch it. Once up to speed vibration is clearly higher frequency and less noticable. I screwed it to a piece of wood which I clamp to the bench, initially without the rubber feet. Mistake. They're needed to damp vibration.

Operation. Good... One exception. The crappy toolrests are tiny benl steel, about 1" square. No way I can keep anything at a constant angle to the wheel with that. I've built a simple wooden angled rest for turning tools, screws tight to keep a constant angle. Can't use it as is, since the grinder has a piece jutting out which forbids butting anything close to the wheel. Thinking about sawing the arm off to allow my rest to be clamped to the bench in front of the wheels.
Speed is about right. I needed to really hit it hard to get any real heat into the metal, which is wrong.

Minor nit. Good kit has electronic braking. This grinder takes minutes to run down. Not that I'd want to do much with it quickly, just that is a little dangerous when spinning and I've forgotten all about it. Perhaps marker pen on the outer
edges of the white wheel will help


Summary. Good buy. The rest is annoying but can be resolved.

Anyone wanting a whetstone grinder, with a tiny 5" wheel? Tenner and it's yours if you can pick it up from Peterborough. pm me if you're interested.
 
I've got the same grinder and it seems pretty smooth to me. Might just be your grinder. I've don't get tools moving on the table (and I have plenty of tools on the table all the time). I certainly don't get the grinder wandering round at all. Might be worth checking everything is running true.

The only extra I bought was a diamond cleaning/dressing tool from axminster. The white wheel definitely cuts better when it is clean.

Dave
 
New grinder = new wheels, and new wheels need dressing to make them perfectly circular and concentric to the spindle. Once dressed, vibration will markedly reduce. Note that the wheel will probably still move from side to side (don't dress the side of the wheel!) Remember too, unblanaced wheels can be dangerous!
 
ivan":3si1az51 said:
New grinder = new wheels, and new wheels need dressing to make them perfectly circular and concentric to the spindle. Once dressed, vibration will markedly reduce. Note that the wheel will probably still move from side to side (don't dress the side of the wheel!) Remember too, unblanaced wheels can be dangerous!


So why do they sell unbalanced wheels?

Surely RecordPower have the means to either spec them balanced or
balanced themselves, especially if it is dangerous.
 
I had a similar query about the six inch version of this grinder.

https://www.ukworkshop.co.uk/forums/view ... ht=#250962

Record told me that the vibration will be worse as the stone speeds up and slows down.

As for the toolrests, cut them off, but you might want to use them to dress the wheels before you do.

Selling 'unbalanced' wheels? Must be down to cost.

Cheers

Dave
 
I bought the same grinder in January (was only £40 at Yandles! 8) ) and I'm pleased with it; does everything I need it to. While I've also noticed it can vibrate a bit I don't have any problems with anything moving around my bench... I do have an un-used dressing stick somewhere so I'll see if that helps, thanks.

I think that whether or not you burn your edges is down to practice and technique, with these stones. Irons and chisels seem more likely to burn when your grinding the outer edges as well.
 

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