Don
Cave Dweller
He wants you too, Malachi.
Member since December 2009
Posts: 2,616
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Post by Don on Sept 21, 2011 22:37:08 GMT -5
I could use some direction on how to restore an old grinder I came into posession of. It's an old Star diamond 4 wheel grinding unit with an under-slung motor. It's similar in design to this: barrancadiamond.com/lap/plm_gp8.htmlThere is a lot of rust damage inside the bottom tray where the paint has come away. what's the best method for removing the rust and paint? can I grind it off with a sander or would a chemical solution be best? The rest of the unit appears to be in good shape, I'm looking forward to putting it to use! Thanks,
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Post by jakesrocks on Sept 21, 2011 22:54:02 GMT -5
Probably the easiest way would be with Super Iron Out. Just mix up a batch in hot water, and pour it in the tray. Get the big bottle of Iron Out while you're at it. It's great for removing iron stains from specimen rocks. Don
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Don
Cave Dweller
He wants you too, Malachi.
Member since December 2009
Posts: 2,616
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Post by Don on Sept 21, 2011 23:58:27 GMT -5
hmm...I just might have some of that on hand. Thanks Don!
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Post by Woodyrock on Sept 22, 2011 0:48:54 GMT -5
If you do not have the Iron Out, get some citric acid. Beer, and wine making supply places carry it for a bottle sterilizer , but it is really great stuff for converting rust back to iron. Mix a cup to gallon of hot water. If it is warm to hot when you use it the rust will convert in less than an hour. When it has converted, just rinse the metal, and dry it quickly, or it will flash rust. You can safely dispose of the solution anyway you like....it would even be safe to drink...if you could get past the iron taste. Woody
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Post by Rockoonz on Sept 22, 2011 3:53:54 GMT -5
If you repaint with a product called POR15 you will prevent future rust for a good long time. The Eastwood company also makes some coatings that are comparable.
Lee
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Don
Cave Dweller
He wants you too, Malachi.
Member since December 2009
Posts: 2,616
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Post by Don on Sept 22, 2011 9:49:43 GMT -5
Thanks woody, I think I have some citric acid too...use it for canning tomatoes...lol
Lee, I'll look for the POR15.
Thanks!
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
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Post by quartz on Sept 22, 2011 22:17:49 GMT -5
I redid one of these machines some years ago, still like it a bunch. One thing I found before building a new table was that I rubbed the drive belt ocasionally with my leg, not a fun feeling. Moved the motor up on the table when I rebuilt it. I've heard the same comment from others. Offering this only as food for thought. Larry
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Post by johnjsgems on Sept 23, 2011 10:05:01 GMT -5
If it is an 8" unit the bottom trough should be tin. The replacements from Barranca are very expensive but probably still available. The unit pictured is the new cast aluminum direct drive unit. The older units had the pan cut back and bottom to allow mounting motor under to save space or behind. If the steel isn't rusted through the treatments mentioned will work. I had an old drop saw with a rusty pan and coated it with an aluminum cooler coating. It was not pretty but it held water. You can buy a spray on material from an auto parts store that will turn the rust black and stop any new rust. I don't remember the name but it looks like the Duplicolor touch up paint cans.
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Don
Cave Dweller
He wants you too, Malachi.
Member since December 2009
Posts: 2,616
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Post by Don on Sept 23, 2011 11:27:31 GMT -5
I redid one of these machines some years ago, still like it a bunch. One thing I found before building a new table was that I rubbed the drive belt ocasionally with my leg, not a fun feeling. Moved the motor up on the table when I rebuilt it. I've heard the same comment from others. Offering this only as food for thought. Larry I've been wondering about that under slung motor. did you have to modify the pan at all so it could be mounted behind the arbor on the table instead? I have plenty of room on the table top for a motor.
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Don
Cave Dweller
He wants you too, Malachi.
Member since December 2009
Posts: 2,616
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Post by Don on Sept 23, 2011 11:38:17 GMT -5
Thanks John. The pan looks steel to me, heavy to lug around. I didn't notice a cutout in the back for the motor, but there was one at the bottom for an under-slung mount, I'll have to take another look at it. The rust doesn't appear to go all the way through in the pan so I think it will be ok...just need to clean it up and repaint.
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quartz
Cave Dweller
breakin' rocks in the hot sun
Member since February 2010
Posts: 3,341
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Post by quartz on Sept 24, 2011 0:06:59 GMT -5
My machine has cutouts for putting the motor either behind or under, I covered the "under" hole with siliconed sheetmetal when I moved it to the back from underneath.
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