Why is only one machine rusting?

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Forum topic by MrRon posted 10-20-2014 07:09 PM 1170 views 0 times favorited 11 replies Add to Favorites Watch
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5264 posts in 3481 days

10-20-2014 07:09 PM

Topic tags/keywords: question jointer

I have a table saw, bandsaw, drill press, lathe and jointer in my shop. All have cast iron tops. All tops are relatively free from rust except for the Powermatic 6” jointer. There is no wax or other rust preventative on any of the machines, but the jointer has a thick layer of rust on the tables and fence. I did derust it a while back and waxed it, but it now has a lot of rust. I don’t use it very often. It is the only Powermatic tool I have, so I wonder if there is a difference in the cast irons used by various manufacturers.

11 replies so far

View Pezking7p's profile


3230 posts in 1889 days

#1 posted 10-20-2014 07:53 PM

What did you derust with? Some of those chemicals need to be washed off with soap/water or the rust will return just as badly as before.

-- -Dan

View distrbd's profile


2252 posts in 2684 days

#2 posted 10-20-2014 08:24 PM

That’s strange isn’t it,Maybe the jointer is subjected to more temperature changes/variations ?gets warmer and colder than the rest of the tools ? is it near a heat source or cold draft?

-- Ken from Ontario, Canada

View Surfside's profile


3389 posts in 2411 days

#3 posted 10-20-2014 08:49 PM

I am sure that a lot of members would recommend you to use some products to remove and prevent the rust on your tool. But I just want to remind you to keep your shop heated in the winter and cooled in the summer.

-- "someone has to be wounded for others to be saved, someone has to sacrifice for others to feel happiness, someone has to die so others could live"

View Loren's profile


10477 posts in 3886 days

#4 posted 10-20-2014 09:04 PM

It seems to me that older cast iron machine tops with
a brown patina seem to resist surface rust, assuming
one doesn’t sand the patina off. If your jointer is
unpatinated and other machines are, then this could
be part of the reason the jointer is developing more

Just my pet theory tho. I may be deluded on the matter.

View Ross's profile


142 posts in 2210 days

#5 posted 10-20-2014 10:54 PM

Try covering the jointer with a couple of 100 % cotton bath towels when not in use. They will absorb humidity and help to keep your cast iron tops rust free. All of my stationary tools with cast iron tops are covered with bath towels when I am not using them. It also keeps the saw dust off them.

-- "Man Plans and God Laughs"

View Grandpa's profile


3261 posts in 2913 days

#6 posted 10-20-2014 11:03 PM

More steel in that cast iron than in the others. Better grade of iron.

View timbertailor's profile


1594 posts in 1662 days

#7 posted 10-21-2014 12:09 AM

Uhhhhhhhhh…......................because you are just luckier than the rest of us?

All my machines would be rusted.

-- Brad, Texas,

View Loren's profile


10477 posts in 3886 days

#8 posted 10-21-2014 12:10 AM

Consider that jointers over time get wear in a specific
region from edge jointing, the “more steel” in it
makes sense. Also it’s Powermatic, a maker known
for quality castings.

View MrRon's profile


5264 posts in 3481 days

#9 posted 10-21-2014 10:44 PM

That could be it. More steel in the cast iron equates to more iron oxide (rust). I don’t use any chemicals to derust cast iron. I use scuffy pads and WD40 to remove rust followed by a coat of Carnuba wax.

View buildingmonkey's profile


242 posts in 1785 days

#10 posted 10-22-2014 12:16 AM

I took a cast iron part to a welder to get repaired, and he said that all cast iron in the US is cast steel after a certain year. So he could just weld the part with steel rod. I thought it needed to be welded with a special rod for cast iron. He was right, as the piece has stood up for at least 10 years. I’m still using the machine. So makes sense that there would be steel in a cast iron top if made in USA. Can’t comment on cast from China.

-- Jim from Kansas

View Don W's profile

Don W

19045 posts in 2805 days

#11 posted 10-22-2014 12:22 AM

Get the rust off and give it a couple coats of spray shellac.

-- - Collecting is an investment in the past, and the future.

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