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  1. J

    Material Selection and Dimensions

    It will depend on the weight of your pendulum bob. The big one might be appropriate for a heavy bob. I use .006 feeler gauge, about .4" wide, and make the chops. My pendulum bobs these days weigh 11 or 12 lbs. Johnny
  2. J

    Material Selection and Dimensions

    Devils - I have watched quite a bit of clickspring, and appreciate his craft. However, thread suspension is not as secure, precise, and accurate as a spring suspension. If you care about accuracy, use a spring. keep us in the loop, Johnny
  3. J

    Material Selection and Dimensions

    AKA oil-hardening flat stock MSC #76110105 McMaster 9018K13 Stuff hardens and tempers nicely, and with your CNC it should shape almost perfectly Johnny
  4. J

    Material Selection and Dimensions

    Devils - My escape wheels are 1/16 th., I would think 1/8 wouldn't be too heavy. The pallets sustain most of the wear in the escapement. That said, the pallets can be any thickness; they don't have the inertial problem. I use Starrett feeler gauge stock .006" or .007 for heavy pendulums...
  5. J

    Material Selection and Dimensions

    Devils - 353 brass is a good choice for the wheels. The escape wheel should be thinner than 1/4" to keep its weight/inertia down. The wheel obviously doesn't have much force driving it, and it needs to accelerate pretty quickly. The plates can be as thin as 1/8" thick, but are almost always...
  6. J

    Vibrating pendulum rod

    You don't have enough safe "lock" on the dead face, what you call "stopping face". It appears that the corner between the dead face and the impulse face is somewhat rounded, and the scape teeth sometimes land on the rounded part. It is crucial that this point be a sharp as possible. In a...
  7. J

    Pendulum micro-adjuster

    OK, now I looked at your pendulum thread from earlier this year. I am somewhat confused as to how it is expected to work. In that thread you say " Section A grows downward, section B grows upward", however section B has a lot more mass expanding upward than section A has expanding downward...
  8. J

    Pendulum micro-adjuster

    What is it not doing? Conventional wisdom has the weight trays for minute adjustment at midway between suspension and c.g. of the bob. I'm not sure why this would be different. What material is the rod and compensation? Johnny
  9. J

    Owner built precision regulator

    Wow Jim! Congrats on getting that one done. I know it was a big project. Great to hear from you. Johnny
  10. J

    Grasshopper skeleton Clock

    VERY nice Pavel. I'm going to look through your pictures of construction. I wish you had posted them in progress - a "build log", but I'm sure I'll enjoy them as I look through. Johnny
  11. J

    Material Selection and Dimensions

    McMurray also doesn't show up on Google searches because they won't submit to the "pay to play" policy. They really have much better prices. For arbors that are not integral with the pinions, drill rod (O1) is fine, for machining hardenable steel for pinions I like 41L40 best. Johnny
  12. J

    Material Selection and Dimensions

    Looks like Allan beat me to it! Johnny
  13. J

    Material Selection and Dimensions

    260 will not work very well, it's gummy to machine and doesn't drill well. It is made to be formed or bent, not machined. 360 is what the rods will come in anyway, and try to stick with 353 for plates and wheels. I realize these are more expensive, but you will be happier. If you do go with...
  14. J

    Material Selection and Dimensions

    Before you decide on aluminum, check with McMurray Metals in Dallas about brass prices; they are MUCH better than the other "usual suspects". They'll cut just whatever you want. 1-800-658-5688 Johnny
  15. J

    Overall Gear Train Calcs Plus Hour Hand Question

    The escapement is the biggie, for sure, especially the Graham. Penman "Practical Clock Escapements, and Goodrich "The Modern Clock" both have pretty good material on Graham design/execution. It looks like you're using a capable CAD which helps a lot. Johnny
  16. J

    Overall Gear Train Calcs Plus Hour Hand Question

    Looks like you got it right. What module are you considering? Do you have a style of case in mind? When you get started, take plenty of pictures so we can watch your "build". Johnny
  17. J

    Overall Gear Train Calcs Plus Hour Hand Question

    Cannon pinion 15 t, intermediate wheel 45 t. (3 to 1), intermediate pinion 12 t , hour pipe wheel 48 t (4 to 1). Centers are right, the module cutter for the 12 t. pinion will do a fine job on the 15 t. pinion. 3-to-1 plus 4-to-1 equals 12-to1. For the record, I use exactly that...
  18. J

    #6 regulator with mods

    Thank you Hessel. It's been running for several months, waiting on the case. I haven't calculated weight efficiency, but it needs less than half what my other more normally pivoted clocks do. I attribute this to the hybrid bearings and full jeweling. It is slightly under-compensated; as it...
  19. J

    #6 regulator with mods

    And at last the case is done. We had more beveled glass problems; it seems to be harder to get done right, at least in the hinterlands of the Southwest.
  20. J

    Tower clock ready

    Very nice Hessel! I like the "technical" look. Johnny
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