Re: [gingery_machines] new article available: An Experimental Way to Statically Balance a Bench Grinder

 

Andy M,

Good question. It might have been out of ignorance or it might have been to save money. However, my thick washers have never caused any trouble in the last 22 years so maybe they do know a thing or two.

As I see it, you have a grinding wheel which is held by a pair of paper washers backed by steel washers. The surface of the wheel is rough. As long as the thickness of the paper is more than the peak of the highest grain, you can't get direct contact between wheel and washer. The washers firmly hold the wheel in position, especially when a lot of force is applied during grinding.

If the washers had a lot of spring and did not apply enough force to hold the wheel, then the wheel could move relative to the center of rotation. That certainly would be bad.

If the nut was over tightened and the washers were able to absorb the excess, that would be good. But if someone is going to do that, what is to stop them from continuing to turn the nut until the washer bottoms out? With or without a washer with give, you still must not over tighten the nut.

Using those paper washers reminds me of a great trick I learned about 5 years ago. If you place a single sheet of newspaper between clamping surfaces, you will increase the holding power by a lot. I was told it was a 10 fold increase. Same idea as with the grinding wheel. The paper fills in the gaps caused by imperfect surfaces truing to mate.

Rick
Rick.Sparber.org

On Jul 17, 2011, at 12:16 AM, Andy M <trumpy81@optusnet.com.au> wrote:

> GDay All,
>
> Rick, that is substantially bigger than my washers. I wonder why the
> manufacturer chose that size?
>
> In any case, I think it's safe to say that you don't have the safety
> feature offered by slightly flexing washers ... lol
>
> It's probably going a bit beyond, but are the washers balanced and
> properly centered when installed?
>
> Maybe, precision made washers are not such a bad idea in your case.
>
> Regards
> Andy M
>
> On 17/07/2011 11:38 AM, Rick Sparber wrote:
>> Andy,
>>
>> I just checked and they are stamped from 2.61 mm steel.
>>
>> Rick
>> Rick.Sparber.org
>
>
> ------------------------------------
>
>
>
>

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