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Another couple of Gizmos - simple stuff for students and fun

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  • Another couple of Gizmos - simple stuff for students and fun

    A few other gizmos, the one I really teach with is the "right Angle Transmission". I got that out of "Projects in Metal", an old edition probably 1995 of so. The basic idea is to create a right angle drive device that runs smoothly without gears. The 5 drive rods are .093 drill rod and weld rod, the students actually design and program a bend jig and make the CNC machine bend the drive rods to 90 degrees +/- 1/2 degree, which means lots of arc adjustment. The handle was kind of rigged up by me, but is now CNC bent. The frame is also CNC manufactured after one student programmed it up because he was a bit irate that i wanted them to manually mill it out. The wheels are manually machined and drilled, the students have to trig out the holes, indicate the drive wheels to .001 or better on center, then drill them on a Bridgeport out of a 5-C collett block, which has to be indicated .0005 to the spindle perpendicular.



    The other parts were just made by me and a few students who were trying to make a "wild part" in our own little version of the masterCam wildest part competition in my shop. Start with a 3/8 ball end mill, end with a 1/8 ball end mill. The criteria is to create a .0002 or better "wave", which requires a bit of thought in the increments of degrees in the pattern and some additional use of CAD as a tool and trig to see how they may do it. Fastest part run within the speed and feed criteria as well as meeting the quality criteria is the key, because if you run it too smooth you almost double the time, running not smooth enough does not meet quality. The whole "roughing" and finishing thought and planning process is key as well.



    Just sharing a few simple things. Students love this stuff. They like making tools for the tool box when they are going into the trade and know why, but some just don't get the why until they make a few smaller "gadgets" and gizmos to gain the love and appreciate the true artistry of machining first.

    Yes, the students do make air motors as well as parallels, hammers, tap wrenches, and some real cool levels



    CCBW, MAH

  • #2
    If you let them use a bit more metal, the right angle drive model could be air powered, and I hope the two Pauls don't come knocking cos someones "Lifted" their Logo's. Unless you can appreciate the processes involved in making such "Simple" objects and do a mind map, it's easy to glance and pass on by.

    Regards Ian.
    You might not like what I say,but that doesn't mean I'm wrong.

    Comment


    • #3
      Do the bent peices on the rght angle drive slip into the driving wheel and rotate within the driven one? How smooth is it?

      It's a great idea.

      Dan
      At the end of the project, there is a profound difference between spare parts and extra parts.

      Comment


      • #4
        The legs slip in holes on both the drive and driven. It runs very smooth. The design considerations included:

        Right angles having to be less than 1/2 degree error.

        Including the bend radius in the figuring between the drive and driven wheel

        length of legs - when at the top of the stroke, the legs are flush with the backs of the wheels, when at the bottom of the stroke (the legs almost hitting on the radius of the bend) the legs not being so long they hit the mounting screws- compactness of design....

        The wheels were already a size determined by me from the original plan - which had NO dimensions, I kind of interpolated them - don't quite remember how...

        The design also had to have exactly spaced holes within .003 to .005 True position of the legs bound up.

        The hole diameter for the .093 legs was .101.

        Lots of thought went into the right angle transmission, most during just plain making it fit to the wheels and frame which were - as I said, interpolated from a picture.
        CCBW, MAH

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        • #5
          I'm thinking (yeah it's a struggle ) that sometime a year or three ago we had a link posted here that show that right angle drive in motion.

          Anybody else remember that?
          Lynn (Huntsville, AL)

          Comment


          • #6
            Originally posted by lynnl
            I'm thinking (yeah it's a struggle ) that sometime a year or three ago we had a link posted here that show that right angle drive in motion.

            Anybody else remember that?
            http://www.youtube.com/watch?v=5ZRKNlY7enM

            http://www.youtube.com/watch?v=2F58EKhapHY

            http://www.youtube.com/watch?v=DfwmG1jnl0I (turn down the sound!)

            Comment


            • #7
              What is this OCC bullshlt? If you want to advertise, put YOUR name on it and be proud of it. To heck with glorifying somebody else. Do you work for them or do they put bread in your mouth? If so, fine. But I believe wanting to be associated with a brand name is for FOLLOWERS not independent thinkers or leaders. I never wear clothes that has any brand logo on them. I may wear a Ford baseball cap. That is because both of my grandfathers came to the United States to work in the Ford stamping plant, and that is the reason I was here to grow up in this great country. But of you display brand names to be cool and be liked by your peer group, you may want to rethink things. You can do what you want. This is just my opinion.

              --Doozer
              DZER

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              • #8
                The students have more talent than both Pauls. If Paul made that, he would of tack welded on some gay looking model rockets and other non functional garbage then farmed out all the hard work to some one to actually make it look decent.

                Comment


                • #9
                  Originally posted by BillH
                  ... tack welded on some gay looking model rockets and other non functional garbage...
                  I would prefer that your posts not dwell on just how model rockets make you feel; I know they're very Freudian and all, but worrying about their sexual proclivities is really off-topic.
                  Bart Smaalders
                  http://smaalders.net/barts

                  Comment


                  • #10
                    WHEW!!! Talk about fast thread drift!!!!!
                    Ernie (VE7ERN)

                    May the wind be always at your back

                    Comment


                    • #11
                      WTF?

                      Outbursts are weird and off topic.

                      Comment


                      • #12
                        Originally posted by Teenage_Machinist
                        WTF?

                        Outbursts are weird and off topic.
                        Ok so Barts and Teenage Machinist are gay...

                        Sanfrancisco bay area?? No WONDER your not chasing girls and talking about health care. Your looking for some government to pay for your aids medicine.

                        Comment


                        • #13
                          Originally posted by dockrat
                          WHEW!!! Talk about fast thread drift!!!!!
                          My thoughts exactly! We hadn't gone but 4 or 5 post and blood was flowing freely! I'm going to duck for cover and see what the next 5 post bring We'll be looking for an ME.

                          I don't want to be accused of being On Topic but, neat project and I'll bet the kids enjoyed it a lot.
                          - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
                          Thank you to our families of soldiers, many of whom have given so much more then the rest of us for the Freedom we enjoy.

                          It is true, there is nothing free about freedom, don't be so quick to give it away.

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                          • #14
                            San Fransisco Bay Area: The Republic of Unbigotedness!


                            Gayness: I'm not.

                            Girls: I did never say I did not care about them!

                            The angle coupling: I have heard of an engine made that way. LittleMachineSHop sells plans as the Elbow Engine. Is that what you mean, Circlip?
                            Last edited by Teenage_Machinist; 01-24-2009, 07:34 PM.

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                            • #15
                              Originally posted by BillH
                              Ok so Barts and Teenage Machinist are gay...

                              Sanfrancisco bay area?? No WONDER your not chasing girls and talking about health care. Your looking for some government to pay for your aids medicine.
                              I was trying to point out that using the word "gay" as a pejorative slur is either marks you as a bigot, or someone still stuck in junior high. Name
                              calling isn't exactly polite or related to machining.

                              Getting back to machining, I'd like to find some plans for one of those tap wrenches; that looks like a nice project. What I really should make is a big wrench ala the nice Starret tap wrench handles; I used a regular tap wrench w/ the sliding handle to cut some 7/16" threads in 4130; that hurt.

                              - Bart
                              Bart Smaalders
                              http://smaalders.net/barts

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