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A simple grinding rest

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RJKflyer12/11/2011 16:44:27
49 forum posts
3 photos
Hi All,
 
Like many others, I have contemplated the Harold Hall rest, but found that it is simply too high for my 6 inch grinder, mounted directly on a small shelf.
 
Also, a pretty complicated device for those of us not looking to do such sophisticated activity.
 
So, after much head-scratching, decided to make something small, simple and notwithstanding pretty much adjustable every which way.
 
The real breakthrough was the suction cup - which removed the major source of hassle about how to mount it on the shelf. Obviously only works with a flat surface, but for those of you without, my first thought (before I spotted the strong suction cup in MSCJ&L) was to use a magnetic stand, and simply rebate a sheet of steel into the shelf.
 
See the photos in my album Simple Grinding Rest.
 
Happy to take any questions!

Edited By RJKflyer on 12/11/2011 16:46:44

Edited By RJKflyer on 12/11/2011 16:47:11

jomac13/11/2011 11:30:54
113 forum posts

Hi I made a similar rest to the Harold Hall one, but mine is bigger and more solid, (20X8mm) with a 150X150X10mm table rest The grinder is mounted on wooden box section frame, which is adjustable for hight and the grinding rest can also be positioned at the side of the wheels, ie cup and a very thin wheel, these are diamond wheels, (DONT use mild steel on them as they wear and clog up) the home made indexer works well, just have to cut a slot into the table rest, and fit fine adjusters, for better control. Everthing is screwed down with coach screws, that way I dont have to fiddle with lost washer and nuts????

John Holloway.

jomac13/11/2011 11:33:57
113 forum posts

Hi I made a similar rest to the Harold Hall one, but mine is bigger and more solid, (20X8mm) with a 150X150X10mm table rest The grinder is mounted on wooden box section frame, which is adjustable for hight and the grinding rest can also be positioned at the side of the wheels, ie cup and a very thin wheel, these are diamond wheels, (DONT use mild steel on them as they wear and clog up) the home made indexer works well, just have to cut a slot into the table rest, and fit fine adjusters, for better control. Everthing is screwed down with coach screws, that way I dont have to fiddle with lost washer and nuts????

John Holloway.

wheeltapper13/11/2011 11:42:13
avatar
423 forum posts
98 photos
when I made harolds grinding rest I realised it was too tall for the grinder and my first thought was "he's got a bigger grinder"
 
then I found a pic of his shop and noticed he had his grinder packed up on blocks, so thats what I did.
 
I personally dont like the idea of a suction cup holding the rest, I,ve had vices with them and they are too unpredictable, it only has to come loose once, then the rest goes into the spinning wheel and................................................
 
only my two pence.
 
Roy
RJKflyer13/11/2011 13:01:28
49 forum posts
3 photos
Yes, I understand the suspicion re suction cups, but I've not had a problem just by keeping it clean. I'm sure it will surprise me one day, but for now, it works for me.
 
That's probably when I'll modify to the magnetic base!
Terryd13/11/2011 15:50:47
avatar
1936 forum posts
179 photos
Hi there,
 
I must agree with Roy regarding suction cups and grinding wheels. Even small grinding wheels are very dangerous. If you have ever taken a wheel mounting course (compulsory in industry and education) you realise just how dangerous these things are. An apprentice colleague of mine found out how quickly flesh and bone wears out when a grinding rest moves. Things happen incredibly quickly. Mind you he did learn to cope quite well once he got used to having only two fingers and a thumb on his right hand.
 
Hoping it carries on working is wishful thinking. You may be prepared to take the chance but please don't encourage others to do so.
 
Regards and my very best wishes,
 
Terry
Harold Hall 113/11/2011 19:05:37
418 forum posts
4 photos
I too have reservations regarding using a suction cup to secure a grinding rest, though to be fair I have no experience of using them. However, I also have reservations regarding using a single magnetic base, and this is something I do have experience of.
 
Whilst a single base takes some pulling off it can, relatively easily, be twisted on its mounting surface. I did consider using the method with my more adaptable grinding rest but soon shelved the idea. The problem was though easily overcome by using two bases spaced apart. This can be seen seen on my website at
 


With that form of mounting there is almost total flexibility as to where the rest is positioned and simplifies setting it up appreciably.

Incidentally, I now have about 80% of my MEW articles on my website which runs to 400 pages. I intend to add most of the other 20% at some time but progress will now be rather slower.

Harold

RJKflyer13/11/2011 19:41:03
49 forum posts
3 photos
Well, I'm humbled to have enticed you to comment Harold. As someone who has taken to machining in the last two years, I can only thank you for the inspiration your articles and books have brought me.
Harold Hall 113/11/2011 19:50:33
418 forum posts
4 photos
Thanks RJ, a little encouragement goes a long way!
 
Harold
Nicholas Farr13/11/2011 22:05:04
avatar
3136 forum posts
1432 photos
Hi RJ, neat and simple griding rest, however, I to have reservations about the suction cup. I'm a bit from the old school as far as these things go, nothing like having things bolted down. I've read about Harold's twin magnetic base idea, and would be confident with it, provided they are attached to a good clean and flat surface, but still prefer bolts myself.
 
Regards Nick

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