Archive for the ‘Myers, Tom’ Category

March 16, 2014 · by David Gilbert · Erector Sets, Machines, Myers, Tom

Tom Myers’ Mechanical Wonder

Tom writes: This model is actually a combination of two models from the 1930 #10 manual – the “mechanical wonders” section. A “bell crank drive” and an “out-of-line drive” are both driven by an A-49. I have not only substituted the newer motor for a P-58 but have also used newer base plates instead of a GA plate. As a kid in the fifties/sixties I was very attracted to the motion erector sets offered, I never, of course, realized what a 1930 #10 offered!

  • Video of Tom Myers’ Mechanical Wonder

Tom Myers’ Multiple Straight Line Drive

Tom writes: This model is from #9 mechanical wonders “multiple straight line drive”. Mine uses some newer parts for base plate and an A-49 motor. The 1929 manual gives no indication how the AT axle is connected to the two EMs. I connected mine with a P-15 so it only really connects to one of the EMs. The two Hs must be aligned on the same spot on each CJ for symmetrical push/pull. The AY does not really do anything but looks good and maybe keeps the action smoother.

  • Video of Tom Myers’ Multiple Straight Line Drive
· by David Gilbert · Erector Sets, Machines, Myers, Tom

Tom Writes: This model is from the 1929 manual in the #9 Mechanical Wonders section. I found this model a test in patience. I would be impressed by the 10 year that can put it together. The order of assembly and orientation of parts is important since many parts are inaccessible once the model is completed. Even orientation of the screw heads vs. nut needs to be considered. I don’t want to admit how much time I spent getting this model working.

It does provide a good example of how rotary motion can be converted to reciprocating with no vertical deflection of the reciprocating linkage (‘straight line’). The biggest challenge is to get the CJ to mesh and track well within the FZ internal gear. I found it necessary to minimize wobble of the CR by wrapping its axle with .001 brass foil where it rotates within the BT. The screw that forms the axle for a CJ must be tightly fastened in one of the CR slots (not a hole). That allows one to adjust the play between the CJ and the FZ. At first I questioned the need for a G 7-hole strip on top of the CJ, as the model would work without it. It turns out that the longer throw of the G strip makes the P57D move with almost no deflection from the horizontal. However, connecting the strip as shown in the manual seems impossible. From the pictures you can get an idea of how I did it. The last thing concerning construction is I do not understand how everything can fit within the dimensions provided by FA screws; I needed to use non-Erector 2 inch screws. It is interesting that the gear ratio between a CJ and an FZ is 1:2 so that the CJ makes exactly 2 revolutions each time it circles within the FZ.

  • Video of Tom Myers’ Straight Line Drive
March 14, 2014 · by David Gilbert · Bridges, Erector Sets, Myers, Tom

Tom writes: This is a Railroad Bridge shown in the 1929 #10 manual.

It is in the section for models to be made with the B accessory set or #10 set with additional parts. The only major difference with my version is that the horizontal EX girders shown in the manual are not used. My reason was because I did not have enough EXs and they seem to be only aesthetic, not structural. They appear to be a veneer on top of the structure. The bridge as I made it is very stout due to all the trussed square girders and would support a substantial weight, though I have not tested its limit. At five feet long it uses a lot of parts: 56 Bs, 136 Cs, 28 EXs, 10 EYs, 92 Is (or substitute Hs for some Is), 10 MN plates, 8 BE, 28 AH, and many CHs. I used almost all the nuts I have and needed to buy more long 8-32 screws in 3/4 and 7/8 lengths.