David,
------------------------OT:
IMHO, the winning combination is an Apple Bluetooth keyboard and my iPad. A close second is this same keyboard and my iPod touch.
I also use my iPad 3 times a week while exercising in order to watch streaming movies from Netflix. Works great!
------------------------
I did pull out an old text book and read up on dynamic balancing. The first moment of an object is what you set to zero to get static balance. The second moment set to zero is dynamic balance. If I could only find a simple and low cost way to dynamically balance my grinder. The tube filled with oil and ball bearings would be tricky.
Rick
Rick.Sparber.org
On Jul 20, 2011, at 4:56 AM, David Frantz <websterindustro@mac.com> wrote:
> Hi Rick;
>
> Yes I'm going stir crazy already.
>
> The iPad will get a work out no doubt, it on the charger now, because there is little in the way of TV in this house. The funny thing there was that I was thinking about putting up a TV antenna just a couple days prior to this little fiasco.
>
> As to what you describe with a shot filled tube that may very well have been what i was seeing. You have to understand this was almost 35 years ago and frankly I had little to do with grinding. I don't know if it would be practical to try to develop something like that for a bench grinder sized wheel.
>
> Back then electrical controls where an after thought so it had to be simple. The machines I was familiar with had hydraulic controls for the most part.
>
> Sent from my iPhone
>
> On Jul 20, 2011, at 12:18 AM, RG Sparber <rgsparber@aol.com> wrote:
>
>> David,
>>
>> Sorry to hear about your broken leg. I hope you are not in any pain. I've
>> had my time flat on my back and know that just because you have time, that
>> doesn't mean you are necessarily motivated to do anything except get better.
>> I suspect you iPad is going to get a good workout ;-)
>>
>> We may be in "violent agreement" here.
>>
>> I used my old washers to define the contact area for my new washers. The
>> wheel should not be able to tell any difference.
>>
>> I completely agree about using paper between washer and wheel.
>>
>> I do recall an automatic way to dynamically balance a wheel that used steel
>> shot contained in a metal tube bent into a circle. The tube also had oil in
>> it. Not sure how that worked but somehow the balls did migrate to the
>> correct location. I'm sure the oil slowed things down and was part of the
>> magic.
>>
>> Rick
>>
>> -----Original Message-----
>> From: gingery_machines@yahoogroups.com
>> [mailto:gingery_machines@yahoogroups.com] On Behalf Of David Frantz
>> Sent: Tuesday, July 19, 2011 8:17 PM
>> To: gingery_machines@yahoogroups.com
>> Cc: gingery_machines@yahoogroups.com
>> Subject: Re: [gingery_machines] new article available: An Experimental Way
>> toStatically Balance a Bench Grinder
>>
>> Hi Rick;
>>
>> That reply took a long time to show up in the forums! Must of got lost.
>>
>> When I wrote that I was a busy guy, now I'm on my back with a broken leg.
>> So that means few excuses for not reading your article. So I hope to get to
>> it real soon.
>>
>> In any event I think you are missing a few points here. First it doesn't
>> matter if the steel washers compress or not, they are there to spread out
>> the load created by the nuts. However the steel washers should never be
>> used alone, there should always be a paper or fiber washer between the wheel
>> surface and the steel washer.
>>
>> In tool rooms it is common to see a toolroom grinder with a bunch of
>> grinding wheels hung near buy. With those wheels there is usually a
>> collection of washers hanging. It has been considered good practice to use
>> such paper or fiber washers for as long as I've been around.
>>
>> I don't want to dismiss the importance of balancing the wheels as it can
>> have a huge impact on usability. I'm more concerned about safety.
>>
>> Now we are about to digress and rely on my failing memory On really large
>> grinders they had a device that would attach to the grinders spindle to
>> balance the wheel. I never got the low down on what the specifics of the
>> device was but I was left with the impression it was filled with shot.
>> This will require some research but it would be nice to have a solution that
>> was more or less automatic.
>>
>>
>>
>> Sent from my iPad
>>
>> On Jul 19, 2011, at 8:18 PM, RG Sparber <rgsparber@aol.com> wrote:
>>
>>> David,
>>>
>>> Andy's washers are very different from the ones I have so it is not an
>>> issue. My washers are twice as thick and do not compress. The ones I made
>>> have the same contact area on the wheel but are a much closer fit to the
>>> shaft. The backing washer is part of the insert and greatly reduces
>> wobble.
>>>
>>> I hope you get a chance to read the article so you can see the bigger
>>> picture.
>>>
>>> Rick
>>>
>>> -----Original Message-----
>>> From: gingery_machines@yahoogroups.com
>>> [mailto:gingery_machines@yahoogroups.com] On Behalf Of David Frantz
>>> Sent: Saturday, July 16, 2011 5:22 PM
>>> To: gingery_machines@yahoogroups.com
>>> Cc: gingery_machines@yahoogroups.com
>>> Subject: Re: [gingery_machines] new article available: An Experimental Way
>>> toStatically Balance a Bench Grinder
>>>
>>> Hi Rick;
>>>
>>> I haven't had a chance to read your new piece yet so I don't know exactly
>>> what is being described there. However I totally agree with Andy those
>>> washer have a purpose, you really want to avoid interfering with or
>> removing
>>> those washers.
>>>
>>>
>>>
>>> Sent from my iPhone
>>>
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>>
>>>
>>>
>>
>>
>> ------------------------------------
>>
>> Yahoo! Groups Links
>>
>>
>>
>>
>>
>>
>> ------------------------------------
>>
>>
>>
>>
>
>
> ------------------------------------
>
>
>
>
http://groups.yahoo.com/group/gingery_machines/app/peoplemap/view/map
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