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  1. #16
    Join Date
    Apr 2012
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    Healesville
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    2,129

    Default

    If it was my job I would probably get a ford or holden diff and axles, make an adaptor plate to fit the crown wheel to the carrier hsg and use the splines off the car axles to put on to the fork axles.
    Yup....i would do practically anything to get out of mucking around with those gears

  2. #17
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
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    1,075

    Default

    The equations are here, starting about halfway down https://khkgears.net/new/gear_knowle...imensions.html
    Basically, module = pitch diameter / number of teeth

    More here https://khkgears.net/new/gear_knowle...thickness.html

    Bevel math is hard, hopefully I'll get some experience with it at work eventually

  3. #18
    Join Date
    Aug 2010
    Location
    Toorloo Arm, VIC
    Age
    39
    Posts
    1,270

    Default

    What sort of size is the centre? Bit hard to tell from the shots in the forklift thread, but it looks fairly large...

    Just musing that the LT230 centre diff is pretty compact, and the layout of it might lend itself well to being grafted in somehow. I have two old centres sitting here I can measure up for you, and/or donate to the cause if it might be viable?

  4. #19
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

    Default

    Just Visit Geoff Macnamarra in Moorabbin, he's got lots of gear. Jack McNamara - Differential Specialists

  5. #20
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

    Default

    Quote Originally Posted by Jekyll and Hyde View Post
    What sort of size is the centre? Bit hard to tell from the shots in the forklift thread, but it looks fairly large...

    Just musing that the LT230 centre diff is pretty compact, and the layout of it might lend itself well to being grafted in somehow. I have two old centres sitting here I can measure up for you, and/or donate to the cause if it might be viable?
    Lt230 centre would be about half the size

  6. #21
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default Planetary gears for a forklift diff - can I realistically make some??

    Quote Originally Posted by waxen View Post
    Lt230 centre would be about half the size
    Pretty close I'd say.
    For those outside the Landrover fold - the LT230 transfer case was standard on most landrovers from about 1988-2005, and still being used in the Defenders until end of production in 2015?

    Couple of size photos of the forklift gears.



    Steve

  7. #22
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

    Default

    Shed was on to it a couple of post's back, grab an EA centre, make the appropriate mods to mount the Drive gear, Heat treat the Axle ends and respline to suit the EA side gears

  8. #23
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
    Posts
    2,651

    Default

    Quote Originally Posted by waxen View Post
    Shed was on to it a couple of post's back, grab an EA centre, make the appropriate mods to mount the Drive gear, Heat treat the Axle ends and respline to suit the EA side gears
    Would you believe that the EB wagon that has sat in my front paddock for the last 18 months since I retired it - finally went to the scrappie the week before I got the forklift !!

    Donor diff centers shouldn't be an issue though if I decided to go that way. I've got plenty of Landrover centers lying around, both standard Rover and Salisbury so I can definitely find enough bits for free to hack something together from.

    Had a bit of feedback from the parts bloke today that sounds promising, but nothing confirmed as yet.

    Steve

  9. #24
    Join Date
    Nov 2010
    Location
    Frankston south
    Posts
    102

    Default

    Yeah but you being a Landy nut an all........why on earth would you use that (expletive), unless you're talking Salisbury lol
    Last edited by waxen; 25th Nov 2020 at 11:25 PM. Reason: Disappearing curse words

  10. #25
    Join Date
    Nov 2017
    Location
    Geelong, Australia
    Age
    57
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    2,651

    Default

    Would be a Salisbury donor - although I do have a rover ARB locker on the shelf. Maybe I should use that in case I get stuck on the grass

    Steve

  11. #26
    Join Date
    Apr 2018
    Location
    Drouin Vic
    Posts
    633

    Default

    Just saw your thread Steve, I say have a shot at making them. Heck, you don't have enough projects anyway.
    You've got a shaper to do the splines and a great mill to do the gears (don't recall if you have a dividing head?). I made a set of bevel gears a couple of years ago for a bicycle-powered pottery wheel. No load there- I made mine in aluminium but they are a similar size to what yours will be. The process is not as complicated as Ivan Laws' book makes it seem. They will not be a 'perfect' bevel but for diff side gears in a forklift a little noise will not matter a hoot.

  12. #27
    Join Date
    Nov 2019
    Location
    Brisbane
    Age
    69
    Posts
    452

    Default shaping gears

    The old goat is back.
    https://www.youtube.com/watch?v=d6RmNSiTMwg
    This is the link to the video on shaping bevel gears. Good setup.
    Regards
    BC

  13. #28
    Join Date
    Aug 2008
    Location
    Melbourne
    Age
    34
    Posts
    1,075

    Default

    The biggest problem I see here is that as the tooth count decreases, the difference in tooth profile from inside to outside increases; on a 60 tooth gear, you're only spanning 6 degrees and can kinda ignore it if you wanted to, with 10 teeth you're spanning 36 degrees and things can get funky really quickly.

    Cutting them on the shaper won't make the process any easier because you're still cutting parallel gaps between highly angled teeth, so you still need the tooth thinning correction on the inside.

  14. #29
    Join Date
    Apr 2018
    Location
    Drouin Vic
    Posts
    633

    Default

    Quote Originally Posted by elanjacobs View Post
    The biggest problem I see here is that as the tooth count decreases, the difference in tooth profile from inside to outside increases; on a 60 tooth gear, you're only spanning 6 degrees and can kinda ignore it if you wanted to, with 10 teeth you're spanning 36 degrees and things can get funky really quickly.

    Cutting them on the shaper won't make the process any easier because you're still cutting parallel gaps between highly angled teeth, so you still need the tooth thinning correction on the inside.
    I agree, the setup shown on the shaper has no advantage over doing the same on a mill with an involute cutter, it can even be done with a single-point tool in a fly-cutter-like arrangement. Somewhere there's a video of a bloke doing gears on a shaper that is set up with a cable arrangement to rotate the blank as the table moves past the cutter. I don't know if that would get you the necessary profile for bevels, he was doing spur gears.
    The key to the process is that the cutter has to take two paths for each tooth gap (three if you rough it out first), with the blank rotated a certain amount and then stepped across so the cutter passes through the same cut at the inner (smaller) diameter of the gear but a different path at the other end. Easier demonstrated than explained.

  15. #30
    Join Date
    Feb 2013
    Location
    Laidley, SE Qld
    Posts
    1,038

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