{"id":1617,"date":"2019-08-16T21:31:50","date_gmt":"2019-08-16T11:31:50","guid":{"rendered":"http:\/\/leederville.net\/rocket\/?p=1617"},"modified":"2019-08-16T21:31:50","modified_gmt":"2019-08-16T11:31:50","slug":"preparation-of-the-surface","status":"publish","type":"post","link":"https:\/\/leederville.net\/rocket\/index.php\/2019\/08\/16\/preparation-of-the-surface\/","title":{"rendered":"Preparation of the Surface"},"content":{"rendered":"

After the massive issues with the previous wind – not being able to remove the tube, I decided drastic changes needed to occur.<\/p>\n

The aim is prepare Mandrel so we do NOT need to use Dry Ice to remove it.<\/p>\n

The Solution<\/h2>\n

The Solution is several fold: –<\/p>\n

    \n
  1. Do not heat the shrink tape for more than 10 minutes. This will ensure we don’t accelerate curing excessively, and we still get a chance to squeeze out excessive Epoxy<\/li>\n
  2. We use a combination of Mould Release Wax and a “lubricant” to make removal easier.<\/li>\n
  3. Only let the Curing go for as long as required before removal. i.e. after 6 hrs (guess), remove the tube. i.e. Don’t wait 12 hours.<\/li>\n<\/ol>\n

    We look at each of these points in more detail below.<\/p>\n

    Shrink Heat Tape<\/h3>\n

    The curing occurs faster as you heat the epoxy. As the Epoxy cures, it shrinks and gets ever harder to remove from the Mandrel. Why I had to heat it for 4 hours is beyond me. All I wanted to happen is for the Excess Epoxy to be squeezed out. After ~10mins, the Epoxy is not fluid enough to be squeezed out, so the heater should be turned off and Mandrel be allowed to rotate for several hours<\/p>\n

     <\/p>\n

    Surface Preparation<\/h3>\n

    I wish to use TR-108 – a wax that is applied to the mandrel.<\/p>\n

    \"TR-108<\/a>
    TR-108 General Mold Release<\/figcaption><\/figure>\n

    The lubricant\u00a0 I wish to use is Graphite (product from Bunnings)<\/p>\n

    \"Lubricant<\/a>
    Lubricant to be applied on top of Wax (between Wax and the cash register tape).<\/figcaption><\/figure>\n

     <\/p>\n

    The steps I followed on the next test run are:-<\/p>\n

      \n
    1. Water\/sand from 400 grit down to 2000grit<\/li>\n
    2. Use Methylated spirits to clean surface<\/li>\n
    3. Use Brasso with paper towel to produce finer finish<\/li>\n
    4. Use\u00a0Methylated spirits to clean surface – Do this a number of times to get VERY clean<\/li>\n
    5. Apply 7 coats (1 hr in between) of TR-108. I would apply thin film with clean paper towel, from one end to the other. When I finish, I go back the beginning end with a CLEAN cloth and polish. I polish three times, each time with\u00a0 a new Clothe. That is ONE layer done<\/li>\n
    6. The next day I do ONE more coat of TR-108 wax – same procedure.<\/li>\n
    7. Next I get some Graphite (powder) and sprinkle over entire Mandrel.<\/li>\n<\/ol>\n

      Below\u00a0is a photo of Mandrel with 7 of the 8 coats of Wax applied.<\/p>\n

      \"Mandrel<\/a>
      Mandrel after 7 coats of TR-108 Wax.<\/figcaption><\/figure>\n

       <\/p>\n

      I’m very happy with how it is going, but won’t be sure of effectiveness until we have to take the carbon fiber tube off.<\/p>\n","protected":false},"excerpt":{"rendered":"

      After the massive issues with the previous wind – not being able to remove the tube, I decided drastic changes needed to occur. The aim is prepare Mandrel so we do NOT need to use Dry Ice to remove it. The Solution The Solution is several fold: – Do not heat the shrink tape for … Continue reading Preparation of the Surface<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[22],"tags":[],"_links":{"self":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/1617"}],"collection":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/comments?post=1617"}],"version-history":[{"count":3,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/1617\/revisions"}],"predecessor-version":[{"id":1624,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/posts\/1617\/revisions\/1624"}],"wp:attachment":[{"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/media?parent=1617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/categories?post=1617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/leederville.net\/rocket\/index.php\/wp-json\/wp\/v2\/tags?post=1617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}