Page 2 of 3 FirstFirst 123 LastLast
Results 16 to 30 of 37

Thread: How to stop rust

  1. #16
    I use a fan to remove condensation from a big planer and jointer I use in an unheated space - but in my climate, condensation on the machines only happens a few times /year.

  2. #17
    Join Date
    Nov 2009
    Location
    Peoria, IL
    Posts
    1,726
    It's my opinion that the moisture settles on the cast iron. In our farm shop, if you left a crescent wrench on the drill press table, you could see a clear outline of the wrench while the rest of the table was covered with flash rust.

  3. #18
    Join Date
    Nov 2003
    Location
    Central North Carolina
    Posts
    1,611
    Learn what the term "Dew point" is and take steps to avoid the temperature/ humidity ratio where dew point becomes a problem. Dew point is the temperature at which the relative humidity in the air at that temperature becomes 100%. If the air temperature drops below this point moisture in the air will begin to fall out of the air or form droplets on colder surfaces like your cast iron. Keep your cast iron above this temperature or the humidity below it and you will have no rusting problems.

    Charley

  4. #19
    Quote Originally Posted by Gary Markham View Post
    Just want to pass along something that works for me to prevent rust on your cast iron. Also lowers need to wax so often. I live on the Texas coast between Houston and the la state line. The shop is not climes controlled and everything sweats with the high humidity. I got a new hammer k3 table saw and a new griz 513 band saw at the end of 18. I waxed them as soon as I set them up but still had rust starting in just a few weeks of Jan night sweats. To try something different I ordered the rolled magnetic sheet material. 24 x 10ft from Amazon. Cut it to cover the cast iron and keep it on when ever the machines are not in use. Since doing this for over a year now both machines look like new. I have not had any rust at all on either one. The magnetic sheet works great for me. I still wax a few times a year
    Sounds like you need a dehumidifier in your shop.

  5. #20
    Join Date
    Dec 2008
    Location
    Northern Michigan
    Posts
    4,786
    Keep in mind that no matter what you put on the top you are not protecting the internal parts that are bare. Conditioning the air is the only way.

  6. #21
    Join Date
    Nov 2012
    Location
    North Dana, Masachusetts
    Posts
    145
    Quote Originally Posted by Larry Edgerton View Post
    Keep in mind that no matter what you put on the top you are not protecting the internal parts that are bare. Conditioning the air is the only way.

    I see these threads here from time to time. The focus seems to be on protecting cast iron tables. I always wonder what's happening to the un-waxed bare metal, like insides of machines, electrical connections everywhere, and all kinds of hand tools. I have bought old machines with the insides of the electrical control boxes all corroded from moisture.

    Perhaps a bigger concern is the lumber. I store lumber in the shop, so that it will be dry when I need it. If the wood gets cold and damp, it will be wet. Sheet goods don't bounce back from being wet.

    Finally, if your shop is so wet that moisture is forming on everything, you have good potential for a mold problem.

    I even deal with moisture and wood problems in my wood sheds. The sheds face south, and are open on four sides. I dry firewood to 11% moisture content. However, when it gets warm and wet after being cold, water will condense on the wood. The sheds are lined up to catch the west wind, so when fair weather returns the west wind blows between the spaced stacks in the shed, and the wood dries out again.

  7. #22
    Join Date
    Apr 2018
    Location
    Cambridge Vermont
    Posts
    762
    A lot of the problem is the change in temperatures. Metal once cooled down (say at night when the temp drops) will stay cold as the air warms up. Moisture will then condense on the colder metal. It doesn't just fall down but it will pool on the top of flat surfaces. The underside of a tablesaw table will also rust but it's not going to impact anything. Of course gears, rods/ bearings, and machined parts do need protecting but since they don't come in contact with the wood for your project different sources of protection can be used. Any moisture that does collect will either run off the underside or evaporate. The idea of using a magnetic sheet is that the magnetic force will create a seal so water that collects on top of the sheet can't find a way between the sheet and the cast iron.

  8. #23
    I have a climate controlled shop, but here in NY I still get a little surface rust if I don't keep the heat or ac on. I just repolished some cast iron tops on a PM 60 jointer & am going to try clear coating them & see if that works, I have been covering with card board as I don't use the equipment often & that seems to really keep any moisture off.
    Attached Images Attached Images

  9. #24
    Join Date
    Mar 2008
    Location
    Between No Where & No Place ,WA
    Posts
    1,121
    Larry Edgerton and Alex Zeller mentioned "conditioning" the air. Besides the HTC covers, I run a Modine Hot Dawg heater with a low temperature thermostat. Also keep the doors on the shop cabinets open to allow better air circulation and prevent rust on the tools.

  10. #25
    Join Date
    Dec 2008
    Location
    Northern Michigan
    Posts
    4,786
    Quote Originally Posted by Ray Newman View Post
    Larry Edgerton and Alex Zeller mentioned "conditioning" the air. Besides the HTC covers, I run a Modine Hot Dawg heater with a low temperature thermostat. Also keep the doors on the shop cabinets open to allow better air circulation and prevent rust on the tools.

    I keep the heater at night at 40, thats all it takes. In the summer the A/C barely runs, but it is just enough to control the moisture, and makes it a lot nicer to work as a bonus.

  11. #26
    Join Date
    Mar 2008
    Location
    Between No Where & No Place ,WA
    Posts
    1,121
    Larry: I keep the thermostat at 46 degrees. Next season, just might turn it down another notch or two.

    As an aside, I recall reading about a woodworker who had his tools in large metal wall and free standing cabinets and kept the rust at bay with Golden Rod heaters. I have Golden Rods in both of firearms safes and they work very well and last a long time. The last one replaced worked for about 15 years. Am thinking about a small one for a wood tool cabinet.

    For Those-Not-In-The-Know 'bout Golden Rods: http://www.best-dehumidifier-choice....umidifier.html
    Last edited by Ray Newman; 03-28-2020 at 5:23 PM.

  12. #27
    Join Date
    Jul 2016
    Location
    Lebanon, TN
    Posts
    831
    Got my 24" x 10' roll of magnetic sheet today, thank you Amazon. I'll be cutting it to match various machines tomorrow.

  13. #28
    Since I layed down sleepers, 1" dow board, and t&g flooring, the temperature in my shop does not fall as low as it used to, and have not noticed any rust at all on any machines. Did wax the table on my shaper a week or so ago, helped the power feeder feed some frame material. BTW, I bought some slipit, and it did not seem to want to dry. What is the proper procedure on using Slipit?

  14. #29
    Join Date
    Dec 2006
    Location
    Porter,TX
    Posts
    1,279
    Gary you added another method to combat rust,thank you. I always keep sheet over my equipment,its not the answer but it helps.

  15. #30
    Join Date
    Mar 2003
    Location
    SE PA - Central Bucks County
    Posts
    52,959
    Quote Originally Posted by Jim Andrew View Post
    Since I layed down sleepers, 1" dow board, and t&g flooring, the temperature in my shop does not fall as low as it used to, and have not noticed any rust at all on any machines.
    Keeping the shop air above the dew point really can help with this. A lot of rust problems on machinery is due to condensation because of temperature.
    --

    The most expensive tool is the one you buy "cheaply" and often...

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •