Change Gear 1953 Cincinnati Tray Top

Discussion in 'Tools' started by restore49, Nov 9, 2017.

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  1. Nov 9, 2017 #1

    restore49

    restore49

    restore49

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    Trying to find pressure angle so I can order cutter. 30 Tooth OD 1.7273 DP 22. Tried comparing prints but my eyes are no help. Was thinking 14.5 but concerned Cincinnati may have used proprietary angle ( new $1200.46) Is there a tooth to tooth measurement?? This is the gear it contacts. Bob

    Update 20 Degree Ash Gear has Cutters. C93200 Bronze Life expectancy 26 years.

    Cincinnati Tray Top.png

    Cincinnati Yoke Gear.JPG
     
    Last edited: Jan 4, 2018
  2. Nov 10, 2017 #2

    MRA

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    A good few people on here have recommended this guy's method for making your own cutter:

    http://www.helicron.net/workshop/gearcutting/

    I've read it, and it looks good. You could make a cutter for 14.5 deg PA, cut the gear in something soft, and see how well it works?

    I want to make a couple of change-wheels just to prove to myself I can. I might even cast blanks with curly spokes, just to show off to myself / give me more reason to be angry with myself if I mess it up :)
     
  3. Nov 10, 2017 #3

    restore49

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    Looks possible to build a cutter - can buy cutters for 10-22$ -- just need to figure out the Pressure Angle. Bob
     
  4. Nov 10, 2017 #4

    DJP

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    I cut a replacement gear with teeth at 30 degrees for a worn out Braun food processor. The processor was our wedding gift and parts are no longer available so I justified buying a milling machine to cut a new gear (my wife approved). My method was to attach the worn gear to one end of a shaft that has bushings and a locking bolt and a new gear blank to the other end then mount the bushing holder in a milling vise at the angle desired. I then incremented the worn gear by one tooth, locked the shaft in place and cut one tooth in the blank. 42 teeth later and it was done. It worked so well that I cut two more as spares. The food processor should run for at least 120 years more.

    Making a new gear out of Delrin as a test would be wise. My method, although crude, was effective for the requirement. I only needed one.
     
  5. Nov 10, 2017 #5

    Cogsy

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    Using that link to make the cutter means you can whip up a homemade cutter in a couple of hours (at most really) and cut a test gear to check the pressure angle. If need be you could just keep making cutters with different pressure angles til you narrow it down, then buy the correct cutter if you like. It really is a simple process and works very well.
     
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  6. Nov 10, 2017 #6

    RM-MN

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    Combine the suggestions in post #2 and #4, make the gear cutter out of 1018 and the gear blank from Delrin (acetal). It is fast and easy to make the cutter and Delrin may be all you need for the strength the gear needs. The manufacturer of your lathe might have even used Delrin for those gears had it been invented then.

    I just used a Dremel tool to cut the gashes in the cutter and it worked fine in Delrin. With steel you would need to use a heat treatable steel and make the back relief before hardening it.
     
  7. Nov 12, 2017 #7

    lathe nut

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    I have a 1951 recently got from Craig list, it is the 12 1/2" X 36" real good price because there is a great in the quick change box that is bad, I will look that number and post it maybe we are dealing with the same gear, out of all the machines that I have I like it the best, course getting read t been using it but can't thread or use the feed or cross auto until I get that gear changed, that is a winter project, getting a 16" south bend with a long bed, it needs cleaning and a paint job but is in super shape, fellow just wants it out of his shop, be there for 20 years and never used it, if you want let's share where we can get parts and info. do you have a parts breakdown, I did call Cincinnati the first thing the fellow told me was our parts are very expensive, after that statement I will not buy from them, wonder why other countries and replacing items over here about an attitude like his for starters, I am done.

    angle shot.jpg

    carriage.jpg

    speed selector.jpg
     
    Last edited: Nov 12, 2017
  8. Nov 12, 2017 #8

    restore49

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    We have Twins!. Looks to be in great shape. Should shortly know the specifications on the change gears and after that any gear in the box should be replaceable. Goggle Cincinnati manual #T-107-3 will be free to download and covers your Lathe. More than happy to help. Bob
     
  9. Nov 15, 2017 #9

    lathe nut

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    Thanks Bob, I did send you a PM the gear part number is: 604482, thanks for any help that you can point me to, Joe
     
  10. Nov 15, 2017 #10

    restore49

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    Joe:
    Can not find that number in parts prints? - could you give a clue where in the machine the gear is. Bob
     
  11. Nov 16, 2017 #11

    lathe nut

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    I will scan and send the page with the part showing and page with part numbers, thanks, Joe
     
  12. Nov 21, 2017 #12

    restore49

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    Joe:
    If the part number you have 604482 is correct for the Tumbler Gear on your earlier version machine that would be 600130. That gear is OD 1.7273 DP 22 pa 20 degree 36 Tooth. That is not a common cutter which unless you have one or have a source I will order ($50). Boston gear does not have DP22 in 20 degree. If you remove the slide gear change plate (2 Allen cape screws under the thread number plate) the gear is right there. I will try Delrin with brass insert first to see how it sounds. Will be more than happy to make 2. My plate was missing so had to make one. Bob

    Change plate.JPG
     
  13. Nov 24, 2017 #13

    lathe nut

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    yes, I don't have the time at this present to get it apart, I do have several lathes, use it also, really like it will be nice to get that fixed so I can use the power feed and cut threads, was hoping to find a gear rather than get it from Cincinnati.
     
  14. Nov 24, 2017 #14

    restore49

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    Joe:
    Understand the time crunch - was hopping you could confirm your bad gear - simple for me to make extra if that is the one on your machine that is bad. With the shift cover off the gear rides inside the Yoke Block with another smaller gear left edge of picture. Bob

    Cincinnati yoke.JPG
     
  15. Nov 25, 2017 #15

    lathe nut

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    Bob, I got in the shop this morning and just started to take it apart and of course the cell had to ring, then email and on and on its goes, I work 24 hour call in the oil field and at my age I am getting a little tired of it after many years, want to retire someday here soon so I can go in the shop and play and never answer that cell again and hide from the world for a while, hope to get it tomorrow, thanks so much for you help to be willing to help, Lathe Nut.
     
  16. Jan 4, 2018 #16

    restore49

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    Joe:
    Gear finished C93200 Bronze - best for hardened gear contact but will only last 24 years. Email a mailing address and will send on its way... Bob

    Cincinnati Yoke Gear.JPG
     
  17. Jan 4, 2018 #17

    cammer

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    what did the dp turn out to be .
     
  18. Jan 4, 2018 #18

    restore49

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    Updated my first post - looks like all the gears are 20 degree. Bob
     
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  19. Jan 4, 2018 #19

    cammer

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    got excited. did not see post had been updated where did you get cutter thank you Jon in Ky
     
  20. Jan 9, 2018 #20

    restore49

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    New Cincinnati puzzle - Input shaft to Change gear Box. Noticed gear had a wobble and found this. Cut on Lathe till it feel apart. Shaft is soft gear hard 3/4"shaft was thinking finish taper on both halves set in centers in a jig and Mig weld (do not have tig)? Would appreciate input on procedure. Shaft not available and not trying to build new. Bob

    Change Gear Shaft.JPG
     

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