Shop Tricks, Special Tools, Jigs and Holding-Fixtures

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • He Who Shall Not Be Named
    Moderator
    • Aug 2008
    • 12287

    Shop Tricks, Special Tools, Jigs and Holding-Fixtures

    A quick look at how I modified the bed of this nifty Harbor Freight cut-off saw. I changed the stock holding scheme by removing the supplied mini-vice and replacing it with a simple V-channel holding fixture. Along the length of the V-channel I marked off specific lengths, guides that later dictated the lengths of brass bar, rod, and tube -- all pieces that go into the fabrication of a 1/72 torpedo launcher.

    The mini cut-off saw available from harbor freight is a good tool, but only after you removing the safety-guard which has to be operated by hand to drop the saw onto the work, very aggravating when you're doing production work; removal of the saw return spring; and replacing the nearly useless (under-engineered) angle adjustable work holding vice. Here you see the removed parts and the new V-channel stock holding fixture ready to be bolted onto the saws bed. The other shot is of the two shop drawings I use as I manufacture production versions of our 1/72 torpedo launcher.

    Click image for larger version

Name:	DSCN0139.jpg
Views:	1
Size:	91.5 KB
ID:	99996
    Click image for larger version

Name:	DSCN0164.jpg
Views:	1
Size:	91.4 KB
ID:	99999
    Click image for larger version

Name:	DSCN0156.jpg
Views:	1
Size:	92.6 KB
ID:	99997

    Most of the fastening of the new holding fixture was done with 3/32" pop-rivets. Note that during the alteration work on the saw I removed the bed from the saw portion of the tool. The V-channel is 1/16" thick, 1/2" X 1/2" aluminum secured from the local hardware store.

    Click image for larger version

Name:	DSCN0134.jpg
Views:	1
Size:	93.7 KB
ID:	99993Click image for larger version

Name:	DSCN0141.jpg
Views:	1
Size:	88.4 KB
ID:	99995

    Cheat-marks in pencil within the V-channel to the right of the blade guided me as I cut specific items of brass stock to length. Eliminating the bulky and unreliable vice and substituting the V-channel stock holding fixture greatly simplified and speeding up production work.

    Click image for larger version

Name:	DSCN0145.jpg
Views:	1
Size:	91.3 KB
ID:	99994Click image for larger version

Name:	DSCN0153.jpg
Views:	1
Size:	87.8 KB
ID:	99992

    Here you see an assembled and ready-for-use launcher next to the major brass items used in its fabrication. Most machining was done on the saw, with lesser efforts made at the lathe and mill. Last shot is of the bagged brass parts ready for more machining, fitting, and soldering.

    Click image for larger version

Name:	DSCN0157.jpg
Views:	1
Size:	94.5 KB
ID:	99998Click image for larger version

Name:	DSCN0160.jpg
Views:	1
Size:	93.2 KB
ID:	100000
    ________
    NEW MEXICO DISPENSARY
    Last edited by He Who Shall Not Be Named; 02-19-2011, 02:30 AM.
    Who is John Galt?
  • redboat219
    Admiral
    • Dec 2008
    • 2749

    #2
    I'm curious how you make the o-ring channel in the breech block.
    Make it simple, make strong, make it work!

    Comment

    • He Who Shall Not Be Named
      Moderator
      • Aug 2008
      • 12287

      #3
      Originally posted by redboat219
      I'm curious how you make the o-ring channel in the breech block.
      A very small inside-cutting tool was ground specifically for that job. The graduated scale on the nob of the cross-slide of the tool holder makes those tiny inside cuts quick and sure.

      David,
      ________
      Vaporizer affiliate
      Last edited by He Who Shall Not Be Named; 02-19-2011, 02:30 AM.
      Who is John Galt?

      Comment

      • redboat219
        Admiral
        • Dec 2008
        • 2749

        #4
        David, any more modified tools you can show, like the electric hand drill turned mini lathe.
        Make it simple, make strong, make it work!

        Comment

        • george
          Captain
          • Dec 2010
          • 727

          #5
          Originally posted by He Who Shall Not Be Named
          A quick look at how I modified the bed of this nifty Harbor Freight cut-off saw. I changed the stock holding scheme by removing the supplied mini-vice and replacing it with a simple V-channel holding fixture. Along the length of the V-channel I marked off specific lengths, guides that later dictated the lengths of brass bar, rod, and tube -- all pieces that go into the fabrication of a 1/72 torpedo launcher.

          The mini cut-off saw available from harbor freight is a good tool, but only after you removing the safety-guard which has to be operated by hand to drop the saw onto the work, very aggravating when you're doing production work; removal of the saw return spring; and replacing the nearly useless (under-engineered) angle adjustable work holding vice. Here you see the removed parts and the new V-channel stock holding fixture ready to be bolted onto the saws bed. The other shot is of the two shop drawings I use as I manufacture production versions of our 1/72 torpedo launcher.

          [ATTACH=CONFIG]3974[/ATTACH][ATTACH=CONFIG]3977[/ATTACH][ATTACH=CONFIG]3975[/ATTACH]

          Most of the fastening of the new holding fixture was done with 3/32" pop-rivets. Note that during the alteration work on the saw I removed the bed from the saw portion of the tool. The V-channel is 1/16" thick, 1/2" X 1/2" aluminum secured from the local hardware store.

          [ATTACH=CONFIG]3971[/ATTACH][ATTACH=CONFIG]3973[/ATTACH]

          Cheat-marks in pencil within the V-channel to the right of the blade guided me as I cut specific items of brass stock to length. Eliminating the bulky and unreliable vice and substituting the V-channel stock holding fixture greatly simplified and speeding up production work.

          [ATTACH=CONFIG]3972[/ATTACH][ATTACH=CONFIG]3970[/ATTACH]

          Here you see an assembled and ready-for-use launcher next to the major brass items used in its fabrication. Most machining was done on the saw, with lesser efforts made at the lathe and mill. Last shot is of the bagged brass parts ready for more machining, fitting, and soldering.

          [ATTACH=CONFIG]3976[/ATTACH][ATTACH=CONFIG]3978[/ATTACH]
          ________
          NEW MEXICO DISPENSARY
          Is it possible to post a clearer/darker lined image of your 2 production drawing pages? It is a little hard to see for my old eyes.
          Thanks

          Comment

          • He Who Shall Not Be Named
            Moderator
            • Aug 2008
            • 12287

            #6
            Originally posted by george

            Is it possible to post a clearer/darker lined image of your 2 production drawing pages? It is a little hard to see for my old eyes.
            Thanks
            How bout this?

            Click image for larger version

Name:	DSCN0164 (2).JPG
Views:	281
Size:	79.6 KB
ID:	159584

            David
            Who is John Galt?

            Comment

            • george
              Captain
              • Dec 2010
              • 727

              #7
              Hello again

              Sorry but I can make out most of page one the schematic of the breech BUT I can`t see any information detail on page two with the measurements. PLEASE can you redo that page.
              Again Thank You for your help.
              George

              Comment

              • He Who Shall Not Be Named
                Moderator
                • Aug 2008
                • 12287

                #8


                Click image for larger version

Name:	DSCN0164 (2).JPG
Views:	242
Size:	70.3 KB
ID:	159594
                Who is John Galt?

                Comment

                • george
                  Captain
                  • Dec 2010
                  • 727

                  #9
                  Got the information from the Breech, Thanks. What is that inside angle between .093" & 0.125" ?

                  The launcher, I can`t see anything from that section?

                  Would you consider drawing that one over with the measurements?

                  Thanks Again for Your Time and Help.
                  George

                  Comment

                  • He Who Shall Not Be Named
                    Moderator
                    • Aug 2008
                    • 12287

                    #10
                    Originally posted by george
                    Got the information from the Breech, Thanks. What is that inside angle between .093" & 0.125" ?

                    The launcher, I can`t see anything from that section?

                    Would you consider drawing that one over with the measurements?

                    Thanks Again for Your Time and Help.
                    George
                    I'm not going to invest my time re-inventing a broken wheel. That was an old, superseded design.

                    I'll help a reasonable amount but will step away when asked to joust wind-mills.

                    David
                    Who is John Galt?

                    Comment

                    • george
                      Captain
                      • Dec 2010
                      • 727

                      #11
                      fair enough. The Breech was a Great help. Thanks Again for your Help.

                      Comment

                      • He Who Shall Not Be Named
                        Moderator
                        • Aug 2008
                        • 12287

                        #12
                        Originally posted by george
                        fair enough. The Breech was a Great help. Thanks Again for your Help.
                        You're welcome, sir.

                        David
                        Who is John Galt?

                        Comment

                        Working...