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Question

I need to grind off the rough surfaces of the inner side of the guide rail with a file and an abrassive paper.
Some worn plastic particles were brown to be placed on a product.
(=The particles were blown. As a result of this , the blown particles fell on a product.)

CalifJim · Accepted Answer

messier42 I need to grind off the rough surfaces of the inner side of the guide rail with a file and an abrasive paper. Some ( worn ?) plastic particles were blown to be placed on a product.(=The particles were blown. As a result of this , the blown particles fell on a product.)

Your sentences are grammatical, or nearly so, but I don't think they say what you want to say. I think you want this:

I need to grind off the rough surfaces on the inner side of the guide rail with a file and some abrasive paper because some of the blown plastic particles fell onto the product.

CJ

Messier42 · Answer

Thank you for your reply.
How do they sound different?
to grind the rough surface off
to grind the rough surface out
to grind the rough surface

Blue Jay · Answer

messier42How do they sound different? to grind the rough surface off to grind the rough surface out to grind the rough surface

They are very similar.
to grind the rough surface does not specify that it ended up smooth, merely that it was ground.
to grind the rough surface off suggests that the surface was removed altogether, although the context might make it apparent whether or not this was what you meant.
to grind the rough surface out would suggest it was made smooth, but not necessarily completely removed; here again the context might indicate the exact meaning.

Messier42 · Answer

Thank you.
I wanted to say that the only roughness of the surface was removed so the surface still exists and got soomther. What should I go for?

Blue Jay · Answer

You could say to grind the rough surface smooth.

Messier42 · Answer

Thank you.

Am I understanding correctly?

To grind the bar off = to cut off the bar by grinding
To grind the bar out = to grind the bar smooth.

Some portion of the rock was worn off = some portion disappeared in wear process.
Some portion of the rock was worn out = ??

Blue Jay · Answer

To grind the bar off = to cut off the bar by grinding. You could say this but you would be more likely to say cut off the bar with a grinder if you were talking about using the edge of the grinding wheel to cut through the bar from the side (instead of using a hacksaw etc.). Grind off usually is used to mean remove excess material by grinding. If the end of your bar stuck out 1 cm, and you wanted it flush, you could grind off the end or grind down the end or (in this case) grind it flush.
To grind the bar out = to grind the bar smooth. Not exactly. You would use grind out to describe what you did to the surface, or the finish, of the bar. For instance, if you wanted the bar to be smooth but there were rough places or ridges (perhaps from the manufacturing process) you might grind them out. Note that sand out is used more often.

Some portion of the rock was worn off = some portion disappeared in wear process. Yes.
Some portion of the rock was worn out = ?? Probably not. Worn out indicates that something has been used so much that it is now in such poor condition that it is no longer good enough to use, and should be replaced. It is often used to describe old clothes, shoes, machines etc.

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