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  • #46
    Re: "Rock Its" Build Thread

    Out here in California they don't sell or allow anything that shoots into the air. But that hasn't stopped me!


    Originally posted by davepellegrene View Post
    Believe me with the cost of the stainless they may end up red. Enough celebrating this weekend I may strap some bottle rockets on them and see if I can get them off the ground. Wonder how many it would take to get a hundred pounds off the ground.

    Dave

    Comment


    • #47
      Re: "Rock Its" Build Thread

      I just bought some 4'x10' sheets of 24 gauge stainless steel for a project at work, I think I paid about $90 for a full sheet of steel, I can't believe that a laminate is more than the real thing. Plus you can sell the scrap if you use real steel, a laminate would be pretty worthless once it's cut. I purchased it from Ryerson steel, if they've got a warehouse local to you it might be worth giving them a call, I had it shipped to the shop and ended up wasting a lot of money, I should have ordered it will call and had our driver pick it up.

      24 gauge cuts pretty easily with a pneumatic shear, lowes sells a nice Ingersoll Rand for about $75, and it's easy enough to improvise a press brake for bends in such thin material.

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      • #48
        Re: "Rock Its" Build Thread

        Originally posted by kornphlake View Post
        I just bought some 4'x10' sheets of 24 gauge stainless steel for a project at work, I think I paid about $90 for a full sheet of steel, I can't believe that a laminate is more than the real thing. Plus you can sell the scrap if you use real steel, a laminate would be pretty worthless once it's cut. I purchased it from Ryerson steel, if they've got a warehouse local to you it might be worth giving them a call, I had it shipped to the shop and ended up wasting a lot of money, I should have ordered it will call and had our driver pick it up.

        24 gauge cuts pretty easily with a pneumatic shear, lowes sells a nice Ingersoll Rand for about $75, and it's easy enough to improvise a press brake for bends in such thin material.
        That was my next thought was checking on solid stainless. I am sure I could just get a piece big enough for what I need. My concern was cutting it. Wonder if it could be done with a carborundum blade on a grinder or power saw? I do have an aluminum brake but I am not sure what gauge coil stock is for it, so I am not sure if it will bend it.

        Dave
        http://www.pellegreneacoustics.com/

        Trench Seam Method for MDF
        https://picasaweb.google.com/101632266659473725850

        Comment


        • #49
          Re: "Rock Its" Build Thread

          Dave, man am I envious of your skills, abilities, and creativity. You have built some truly inspiring speaker systems.

          Comment


          • #50
            Re: "Rock Its" Build Thread

            Originally posted by davepellegrene View Post
            That was my next thought was checking on solid stainless. I am sure I could just get a piece big enough for what I need. My concern was cutting it. Wonder if it could be done with a carborundum blade on a grinder or power saw? I do have an aluminum brake but I am not sure what gauge coil stock is for it, so I am not sure if it will bend it.

            Dave
            If you go that route maybe a SS kick plate for doors or check a SS Fab shop they could shear it for you. Cutting SS with a 4" grinder and cutting wheel sometimes leaves that burned or too hot look to it, you have to cut it fast but it does work. I have (2)- 4"x8' toe kick pieces leftover from a job but I'm not sure if it's brushed Alum or SS with a plastic film on it. It says made in Germany but no #'s on it.

            Later
            Dan

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            • #51
              Re: "Rock Its" Build Thread

              look for a semi-trailer repair shop in the area. with all the stainless steen sided trailers out there, they will have pieces headed for the scrap yard. i have access to some nice pieces. i could drop it in marion for you to pick up in three weeks.
              " To me, the soundstage presentation is more about phase and distortion and less about size. However, when you talk about bass extension, there's no replacement for displacement". Tyger23. 4.2015

              Quote Originally Posted by hongrn. Oct 2014
              Do you realize that being an American is like winning the biggest jackpot ever??

              http://www.midwestaudioclub.com/spot...owell-simpson/
              http://s413.photobucket.com/albums/pp216/arlis/

              Comment


              • #52
                Re: "Rock Its" Build Thread

                Hey Dave, this guy has (2) sheets on the bay, maybe an option.
                http://cgi.ebay.com/ws/eBayISAPI.dll...=STRK:MEWAX:IT

                Comment


                • #53
                  Re: "Rock Its" Build Thread

                  Thanks Rogoll for the complement. Good to see you are still around. Hope your health is good.
                  I am really having a good time being able to take my carpentry skills and apply them to something creative like speaker building. Then be able to sit and enjoy them. Not to mention the computer skills and electronics I am learning along the way.

                  Great Idea on the kick plate Dan. Never thought about that. I also have an email to the guy on ebay to see what it would cost to ship it to me. Even if it doesn't match the laminate I have now I could peal it off and make new strips.
                  I was concerned about cutting the solid stainless with the cut off wheel for the reasons you mention. The laminated stuff I can cut on my miter box with front and back backing for the end cuts and the table saw cuts the lenghts real nice.

                  Arlis I will keep that in mind.

                  Thanks Dave
                  http://www.pellegreneacoustics.com/

                  Trench Seam Method for MDF
                  https://picasaweb.google.com/101632266659473725850

                  Comment


                  • #54
                    Re: "Rock Its" Build Thread

                    Some more progress.

                    Made the ports yesterday and cut them into the inner backs today. I think I am going to temporarily seal them so If I need to add or subtract length I can. I am a little fuzzy on tuning. Cross that when I get there. Hopefully Paul will be able to give me some advice if I have a problem. I made them out of 1/2" MDF with a 1/2" round over on both ends.




                    inner back in place.



                    Outer back in place with hole cut out for binding posts. Not sure how I am going to attach the backs. Would be nice if I could do it without any screws. The only thing I can come up with would be velcro, but not sure how well that would work with possible vibration.

                    Dave

                    http://www.pellegreneacoustics.com/

                    Trench Seam Method for MDF
                    https://picasaweb.google.com/101632266659473725850

                    Comment


                    • #55
                      Re: Ports and tuning...

                      When modeling an ML-TL with Martin's software, whatever port length is determined assumes the port will not have much, if any, roundover on either end. If a port, whether for a normal vented box or an ML-TL, whose length without any roundovers is correct for a specific tuning, is replaced with one having significant roundovers, that new port will need to be longer than the port without roundovers in order to have the same tuning frequency. A small-radius roundover should not have much of an effect, if any, but I don't know where to draw the line, as it were. The port length I specified for the ML-TL in this project assumes no roundover whatsoever. You may have to adjust the length of your rounded-over port to end up with the same tuning frequency as in my modeling.
                      Paul

                      Comment


                      • #56
                        Re: "Rock Its" Build Thread

                        You just plain impress me, man!

                        Keep it up!
                        Wolf
                        "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                        "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                        "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                        "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                        *InDIYana event website*

                        Photobucket pages:
                        http://photobucket.com/Wolf-Speakers_and_more

                        My blog/writeups/thoughts here at PE:
                        http://techtalk.parts-express.com/blog.php?u=4102

                        Comment


                        • #57
                          Re: Ports and tuning...

                          Originally posted by Paul K. View Post
                          When modeling an ML-TL with Martin's software, whatever port length is determined assumes the port will not have much, if any, roundover on either end. If a port, whether for a normal vented box or an ML-TL, whose length without any roundovers is correct for a specific tuning, is replaced with one having significant roundovers, that new port will need to be longer than the port without roundovers in order to have the same tuning frequency. A small-radius roundover should not have much of an effect, if any, but I don't know where to draw the line, as it were. The port length I specified for the ML-TL in this project assumes no roundover whatsoever. You may have to adjust the length of your rounded-over port to end up with the same tuning frequency as in my modeling.
                          Paul
                          Crap! Guess I should have checked on the round overs first. I will definitely put them in temporarilyto start.
                          Thanks Paul
                          Dave
                          http://www.pellegreneacoustics.com/

                          Trench Seam Method for MDF
                          https://picasaweb.google.com/101632266659473725850

                          Comment


                          • #58
                            Re: "Rock Its" Build Thread

                            Originally posted by Wolf View Post
                            You just plain impress me, man!

                            Keep it up!
                            Wolf
                            That says a lot coming from you Ben. Hope I can get my head through the door now. :D
                            http://www.pellegreneacoustics.com/

                            Trench Seam Method for MDF
                            https://picasaweb.google.com/101632266659473725850

                            Comment


                            • #59
                              Re: "Rock Its" Build Thread

                              I could do the angles, but it'd take me a few passes to get them right. I bet I cut 20 of the triangular wedges to sit in the baffles/rears of the Scandivifias. But I specially fit them to their locations.

                              Later,
                              Wolf
                              "Wolf, you shall now be known as "King of the Zip ties." -Pete00t
                              "Wolf and speakers equivalent to Picasso and 'Blue'" -dantheman
                              "He is a true ambassador for this forum and speaker DIY in general." -Ed Froste
                              "We're all in this together, so keep your stick on the ice!" - Red Green aka Steve Smith

                              *InDIYana event website*

                              Photobucket pages:
                              http://photobucket.com/Wolf-Speakers_and_more

                              My blog/writeups/thoughts here at PE:
                              http://techtalk.parts-express.com/blog.php?u=4102

                              Comment


                              • #60
                                Re: "Rock Its" Build Thread

                                Originally posted by Wolf View Post
                                I could do the angles, but it'd take me a few passes to get them right. I bet I cut 20 of the triangular wedges to sit in the baffles/rears of the Scandivifias. But I specially fit them to their locations.

                                Later,
                                Wolf
                                MDF is cheap. I don't always get it right the first time. On most of the pieces I used MDF to figure out the angles then went to the walnut once I got it.

                                Dave
                                http://www.pellegreneacoustics.com/

                                Trench Seam Method for MDF
                                https://picasaweb.google.com/101632266659473725850

                                Comment

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