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Bench grinder

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Philip Powell23/09/2018 13:28:58
68 forum posts
15 photos
Posted by Nicholas Farr on 23/09/2018 12:50:31:
Posted by derek hall 1 on 23/09/2018 06:32:06:

Just a couple of questions

I use HSS in my workshop for my lathe tools, I am looking for a replacement bench grinder and it seems an old good un beats a new bad un according to some people on here. So I am looking around various places, if I buy an old but good 7 or 8 inch grinder can I put a 6 inch wheel on it? I suppose as long as the speed doesn't exceed the max wheel speed it should be ok...

Regards

Derek

Hi Derek, it is possible that a grinder with 7 or 8 inch wheels will run too fast for a 6 inch wheel, so check that out to start with. The other thing is that the rest that supports the work, may not reach the 6 inch wheel, especially after it has been dressed a few times. Always best to use the correct wheel for the grinder and the correct grinder for the wheel.

Regards Nick.

Edited By Nicholas Farr on 23/09/2018 12:51:21

A 7 or 8 inch grinder must run slower rpm than a 6 inch.....

Phil.

Pete Rimmer23/09/2018 16:17:54
1486 forum posts
105 photos

I have three bench grinders and I have made new hubs for them to replace the two side plates you usually get. The hubs are drilled/reamed to fit the shaft as good as possible and turned to 1-1/4" OD with a fixed flange one side, to accept surface grinder wheels. Now not only do all the wheels run lovely and true (even on the cheap 6" grinder) but there's a much wider selection of easily-available wheels to choose from.

Mark Rand23/09/2018 19:54:58
1505 forum posts
56 photos
Posted by Nicholas Farr on 23/09/2018 12:50:31:
Posted by derek hall 1 on 23/09/2018 06:32:06:

Just a couple of questions

I use HSS in my workshop for my lathe tools, I am looking for a replacement bench grinder and it seems an old good un beats a new bad un according to some people on here. So I am looking around various places, if I buy an old but good 7 or 8 inch grinder can I put a 6 inch wheel on it? I suppose as long as the speed doesn't exceed the max wheel speed it should be ok...

Regards

Derek

Hi Derek, it is possible that a grinder with 7 or 8 inch wheels will run too fast for a 6 inch wheel, so check that out to start with. The other thing is that the rest that supports the work, may not reach the 6 inch wheel, especially after it has been dressed a few times. Always best to use the correct wheel for the grinder and the correct grinder for the wheel.

Regards Nick.

Edited By Nicholas Farr on 23/09/2018 12:51:21

The other way around!

Be that as it may. If it's a 3000rpm grinder, it'll be good for 8" wheels but 6" wheels will act a bit softer than specified (they'll cut faster and wear out faster)

Nicholas Farr23/09/2018 19:59:20
avatar
3988 forum posts
1799 photos
Posted by Philip Powell on 23/09/2018 13:28:58:
Posted by Nicholas Farr on 23/09/2018 12:50:31:
Posted by derek hall 1 on 23/09/2018 06:32:06:

Just a couple of questions

I use HSS in my workshop for my lathe tools, I am looking for a replacement bench grinder and it seems an old good un beats a new bad un according to some people on here. So I am looking around various places, if I buy an old but good 7 or 8 inch grinder can I put a 6 inch wheel on it? I suppose as long as the speed doesn't exceed the max wheel speed it should be ok...

Regards

Derek

Hi Derek, it is possible that a grinder with 7 or 8 inch wheels will run too fast for a 6 inch wheel, so check that out to start with. The other thing is that the rest that supports the work, may not reach the 6 inch wheel, especially after it has been dressed a few times. Always best to use the correct wheel for the grinder and the correct grinder for the wheel.

Regards Nick.

Edited By Nicholas Farr on 23/09/2018 12:51:21

A 7 or 8 inch grinder must run slower rpm than a 6 inch.....

Phil.

Hi Phil, you are of course right and I stand corrected. Bit of a senior moment I guess and got it the wrong way round. However it may mean the 6 inch wheel is running too slow to be at its most efficient, and is likely to wear away quicker. Still best to use the correct size wheel that the grinder is designed for.

Regards Nick.

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