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One hp is enough to make a grinder but I'd get a 1 hp 1725 rpm AC motor and get the variable speed by using pulleys with it. A one hp DC motor with speed control will work too - its what my grinder has - but we're talking a Leeson 90vdc or 180vdc motor with a $100 controller. Any other type of DC motor like a treadmill motor or other physically small motor with a router type speed control might work but many don't live up to their power rating and every one I've tried to use burnt out pretty quickly.
For the picture, you need a URL if you want to post from your album. If you're album will tell you the URL of a specific picture and you put that URL in your post using the Manage Attachments button then it will work. It would be simpler to have that picture on your own computer, then use Go Advanced to write your post and choose the Manage Attachments button which can then get the picture off your computer ...
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