{"id":271,"date":"2009-01-21T14:04:25","date_gmt":"2009-01-21T21:04:25","guid":{"rendered":"http:\/\/www.nmpproducts.com\/blog\/?p=271"},"modified":"2009-01-21T15:11:13","modified_gmt":"2009-01-21T22:11:13","slug":"steady-progress","status":"publish","type":"post","link":"http:\/\/www.nmpproducts.com\/blog\/?p=271","title":{"rendered":"Steady progress"},"content":{"rendered":"
\"Shorter<\/a>

Shorter legs<\/p><\/div>\n

Decided the mounting stand<\/strong> height needed to be variable so I cut the legs down to stubs that will later be drilled for bolts so’s I can connect top section to bottom section with three pieces of angle iron<\/strong>. For now it’s at a convenient height for me to carry on, on the workbench.<\/p>\n

And yes, I know the pipes aren’t all completely vertical<\/strong>. Once everything else is done and just before I paint the manifold I’ll use a rosebud<\/strong> tip and an oxy-acetylene torch to straighten the offending bits.
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\"Lathe<\/a>

Lathe setup<\/p><\/div>\n

Lathe setup to turn bevels<\/strong> onto lower end of brass ‘bells’. I made good use of my homebrew outfeed support<\/strong>; it has twice the diametral capacity of the unit sold by Myford<\/em><\/strong>, which couldn’t accommodate\u00a0the task.
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\"Tuning<\/a>

Tuning Door Assemblies<\/p><\/div>\n

With bevels cut on all bell bottoms it was time to address the the difficult task of making them tunable<\/strong> for different media, as I want this thing to sound right on air, propane and steam. Taking a\u00a0tip from friends who tune organs I cut all the brass tubes to a length that is 1″ longer<\/strong> than nominal, then I cut a 1\/2″ wide x 1-1\/2″ long slot<\/strong> in the tops of each one. I made little sliding doors<\/strong> that can be easily moved up and down to cover more or less of the slots, thus varying the length of the bells. I plan to tune the whistles on compressed air, then\u00a0scribe marks at the top of each door. A little calculation should give me the relative movements for steam and propane, so that I won’t have to made adjustments on the fly, on hot pipes.
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\"Door<\/a>

Door Clamp Top View<\/p><\/div>\n

Originally I had thought that I could use a little piece of threaded bar<\/strong> inside, to fasten the door to the outside of the bell but the thing wouldn’t always seat right. In the end I opted for the ‘manhole cover’ solution with threaded circular<\/strong> disks as in the photo above.
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Next up: I’m going to build a plywood air box<\/strong> and affix a surplus muffin fan to one side. I’ll bore a hole in the top so I can drop first one and eventually all 12 whistles on the box for tuning. Photos in a few days.<\/p>\n","protected":false},"excerpt":{"rendered":"

Decided the mounting stand height needed to be variable so I cut the legs down to stubs that will later be drilled for bolts so’s I can connect top section to bottom section with three pieces of angle iron. For now it’s at a convenient height for me to carry on, on the workbench. And […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[53,13,11,12],"class_list":["post-271","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-burningman","tag-calliope","tag-shop","tag-steam"],"_links":{"self":[{"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/271","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=271"}],"version-history":[{"count":10,"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/271\/revisions"}],"predecessor-version":[{"id":278,"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/271\/revisions\/278"}],"wp:attachment":[{"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=271"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=271"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.nmpproducts.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=271"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}