Grinder as Sander? - SailNet Community
 
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post #1 of 5 Old 05-17-2005 Thread Starter
CJV
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Grinder as Sander?

I have attached a sander conversion to my grinder in order to prep the surface of a hull section to which I will bond new core material. I am concerned that the grinder''s 10,000 RPM is too fast and that the 50-grit I''m using is too rough.

The resulting finish is quite smooth, so I am not so sure it''s the right technique since I understand I need to leave a rough surface for the epoxy to bond with.

I''ve noticed that electric sanders have a speed of 4,500 RPM. Maybe that is more advisable?

Comments pls.
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post #2 of 5 Old 05-17-2005
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Grinder as Sander?

Grinders can get out of control awfully easy resulting in gouges - I have learned the hard way. Ihave found a good random orbital sander, I like the Porter/Cable, with 80 grit to be a great tool for prepping and finishing glass work. Get the real good disks - they cost more, but last a long time.
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post #3 of 5 Old 05-17-2005
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Grinder as Sander?

If you used 50 grit, it is rough enough, and like it was said before, gouges are the issue with using grinders, but it sounds as if you have already done it without incident. My favorite tool in the whole wide world, and cherish more than just about anything is my DA sander....bury me with that baby!!
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post #4 of 5 Old 05-18-2005 Thread Starter
CJV
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Grinder as Sander?

Thank you, but my concern is that a 50-grit, 7-in disc at 10,000 RPM
a) produces a smooth finish (I''ve verified that) and
b) is a very aggressive treatment for the glass layup i''m working with.
I almost think I need to be at half the RPMs, like the professional sanders I''ve seen have.

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post #5 of 5 Old 05-19-2005
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Grinder as Sander?

It’s also very easy to ‘cook’ the FRG with a 10000rpm Grinder. Any surface ‘glazing’ would be an indication of overheating, as would discolouration. It takes a little skill, and much patience to use a Grinder without gouging or overheating the surface.
I’ve successfully used Grinders on ‘glass, but find that the R/O Sander is much easier to use, and just as quick overall.
HTH,
Gord May
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