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  1. #76
    Dave J Guest

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    I agree, sent it out as is, it's just another job to them.

    Dave

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  3. #77
    Join Date
    Oct 2010
    Location
    Perth
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    90

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    Quote Originally Posted by Brobdingnagian View Post
    It will dissolve paint, grease, oil, brass, copper and pretty much anything organic but not sand.
    I understand it may not actually dissolve the sand itself, but I was crossing my fingers it might dissolve whatever the heck is holding it in there

  4. #78
    Join Date
    Oct 2012
    Location
    Australia
    Posts
    765

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    Quote Originally Posted by Dave J View Post
    Thanks for that as I was wondering about other metals. Is it just the stuff from the supermarket, and I may have missed it but what strength do you use?

    Dave
    Oh and it very reactive with aluminum. Its a good rule to just use it for cast iron/stainless steel/glass.

    The supermarket stuff is fine but I think it is a little cheaper at the hardware stores.

    I use about 50-100 grams per 10L and it works well, takes a day or two to strip back to cast iron and a pressure washer to clean the soft paint off. But it depends a little how game you are; you could go stronger or you could go weaker. The stronger it is the more dangerous it is and the more caution you should use. At the concentration I use a few minutes after an accidental exposure it will start to irritate my skin and burn if left untreated.
    Important: make sure you have a face shield on and flipped down, protective clothing and rubber gloves and some cheap vinegar and plenty of running water on standby to neutralise any caustic soda you might get on yourself. Remember the chemical burn that Jack get on his hand in Fight Club? thats a caustic soda burn... and WILL bind you if it gets it in your eyes.
    Also note that temperature has an impact on the strength, the higher the temperature of the solution that more reactive it is.

    -Josh

  5. #79
    Join Date
    Jul 2003
    Location
    The Fabulous Gold-plated Coast.
    Age
    69
    Posts
    3,925

    Default Foundry sand

    The machine that I restored with sand deposits required old fashioned pick and shovel work, only using whatever implement is in the bottom drawer of the toolbox. I also have a needle scaler which works very well if you have access. Best seems to be a dull screwdriver and a stiff wire brush. In the head of my drill press I mined three cups of oil bonded black sand.
    It's all part of the service here at The House of Pain™

  6. #80
    Dave J Guest

    Default

    Thanks for for taking the time to give the full detailed instructions Josh.

    Yeah I know about burning, we usually use paint stripper and one dot your running for water, LOL
    At least with the paint stripper you can smell if it on you as it has a strong odor to it, but is bloody potent.

    Dave

  7. #81
    Join Date
    Aug 2008
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    near Rockhampton
    Posts
    4,304

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    Quote Originally Posted by Garry 3 View Post

    On a side note I noticed the cylindrical grinder gone off gumtree. I was all set to get this morning too.
    Just remember that grinder never had the original motors on it.... I bet they were replaced with generic non-balanced motors which renders the machine useless for any decent work... Or so I read..
    Light red, the colour of choice for the discerning man.

  8. #82
    Join Date
    Nov 2012
    Location
    Blue Mtns
    Posts
    66

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    Quote Originally Posted by .RC. View Post
    Just remember that grinder never had the original motors on it.... I bet they were replaced with generic non-balanced motors which renders the machine useless for any decent work... Or so I read..
    Never heard that before. It was always felt that grinders were better driven by a flat belt than Vee but again I never noticed any difference.

  9. #83
    Join Date
    Aug 2008
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    near Rockhampton
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    4,304

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    Quote Originally Posted by achjimmy View Post
    Never heard that before. It was always felt that grinders were better driven by a flat belt than Vee but again I never noticed any difference.
    Well the tc grinder and surface grinder I have, both of reputable brands, have exceptionally smooth running motors... There is no vibration at all coming from them... Compare that to a modern fan cooled motor that has vibration, and any vibration will show up in something so fussy as grinding... Hell even a bad wheel dressing will show up in grinding operations... it is amazing how fussy grinding is, it is nearly you need to consult a witchdoctor before each day if you want good results because there are a zillion variables to take into consideration.

    Yes and we are way off topic
    Light red, the colour of choice for the discerning man.

  10. #84
    Join Date
    Nov 2012
    Location
    Blue Mtns
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    66

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    Quote Originally Posted by .RC. View Post
    Well the tc grinder and surface grinder I have, both of reputable brands, have exceptionally smooth running motors... There is no vibration at all coming from them... Compare that to a modern fan cooled motor that has vibration, and any vibration will show up in something so fussy as grinding... Hell even a bad wheel dressing will show up in grinding operations... it is amazing how fussy grinding is, it is nearly you need to consult a witchdoctor before each day if you want good results because there are a zillion variables to take into consideration.

    Yes and we are way off topic

    Yes many things will upset grinding, but I have seen many grinders with fan cooled motors. I had a late model "danobat" grinder (Used Danobat RE-800A. Cylindrical grinding machine - - Exapro) which was superior to the J&S and it had fan cooled motors. Typically "plain" or uber high precision bearings (sometimes pressure fed) were what distinguished a Cyl grinder into the next level of quality. All the crank grinders I have had or used (old and newer) I recall having fan cooled conventional motors. Maybe it can from a time when motor quality/balance was nt what it is today.

  11. #85
    Join Date
    Aug 2008
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    near Rockhampton
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    I meant generic fan cooled motor, the sort you buy from an electrical shop, not a balanced motor as would be fitted to precision grinders...

    Just in my limited experience here is a huge difference between the skills different fitter and turners that might be called upon to repair machine tools have...

    Like my Monarch 10EE saddle had been disassembled in the past but the person putting it back together never connected the oil line that feeds the auto lube system to the saddle ways... What is the skill level of a person that does that sort of thing...?
    Light red, the colour of choice for the discerning man.

  12. #86
    Join Date
    Aug 2008
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    near Rockhampton
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    Moving right along now

    I may have made a bit of an error... I have the bed sitting in a caustic solution... However while the caustic solution will remove new paints... Paints of years gone by are different and the caustic solution will not shift them, or even make them soft.....
    Light red, the colour of choice for the discerning man.

  13. #87
    Join Date
    Oct 2012
    Location
    Australia
    Posts
    765

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    Quote Originally Posted by .RC. View Post
    Moving right along now

    I may have made a bit of an error... I have the bed sitting in a caustic solution... However while the caustic solution will remove new paints... Paints of years gone by are different and the caustic solution will not shift them, or even make them soft.....

    It has taken off any paint I have encountered, some need more time than others. Any idea what it is? Pictures help?

    -Josh

  14. #88
    Join Date
    Oct 2007
    Location
    Sydney
    Posts
    2,340

    Default

    Have you considered electrolysis?

  15. #89
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    Aug 2008
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    near Rockhampton
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    It will not shift paint will it?

    i seemed to have left a f out
    Light red, the colour of choice for the discerning man.

  16. #90
    Join Date
    Oct 2007
    Location
    Sydney
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    Richard, all I get this end was a ##### to your question. I'm in Singapore at the moment so maybe it's their censorship

    If the question was will it remove paint, then the answer is yes. Apparently, but what would I know, I just sit there polishing my machines all day

    An internet search should reveal more than a machine polisher. Do a search and see if you think it may be good for your purposes.

    Pete

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