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  1. #1
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    Default AL960b change gear tooth profile?

    I need to cut an m12 1.75 thread. Unfortunately the AL960b does not come with the necessary change gear. I am thinking of getting a cutter so I can make the gear. I have no idea what tooth profile these gears run. Any ideas?

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  3. #2
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    Get one of your gears and add 2 to the tooth count divide this by the od of the gear,if its dp it should be a whole number or very close,if its not it would probably be a module,at a guess I would say m1.25.

  4. #3
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    Hi,

    Have a look at the lathe owners manual. The manual for my lathe listed all the gears, No. teeth and the module. Yours maybe the same to similar.

    Simon
    Girl, I don't wanna know about your mild-mannered alter ego or anything like that." I mean, you tell me you're, uh, super-mega-ultra-lightning babe? That's all right with me. I'm good. I'm good.

  5. #4
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    Quote Originally Posted by pipeclay View Post
    Get one of your gears and add 2 to the tooth count divide this by the od of the gear,if its dp it should be a whole number or very close,if its not it would probably be a module,at a guess I would say m1.25.
    Thanks pipeclay for the help. The numbers I came up with are as follows:

    (30+2) / 40 = 0.8
    (32+2) / 42.5 = 0.8

    Looks like it is module. Now I have to figure out how to measure the profile to confirm M1.25.

    Quote Originally Posted by simonl View Post
    Hi,

    Have a look at the lathe owners manual. The manual for my lathe listed all the gears, No. teeth and the module. Yours maybe the same to similar.

    Simon
    I checked the Grizzly manual which is much more detailed and did not spot anything on the gear profile. I will hunt down the Chinese manual..

  6. #5
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    Quote Originally Posted by variant22 View Post
    Thanks pipeclay for the help. The numbers I came up with are as follows:

    (30+2) / 40 = 0.8
    (32+2) / 42.5 = 0.8

    Looks like it is module. Now I have to figure out how to measure the profile to confirm M1.25.
    PC's guess was that it would be 1.25, just a guess. You have worked out above that it is M.8. Finer than i would have thought. What gear(s) do you need to make?

    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

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    Variant22, where are you?
    I have a full set of Module 1 cutters if you can use them (for a loan). PM me if that turns out to be the right size.
    Cheers,
    Joe
    9"thicknesser/planer, 12" bench saw, 2Hp Dusty, 5/8" Drill press, 10" Makita drop saw, 2Hp Makita outer, the usual power tools and carpentry hand tools...

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    Get the Jesus nails, wood and hammer out.

    It should of been OD divided by tooth count plus 2.

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    Quote Originally Posted by pipeclay View Post
    Get the Jesus nails, wood and hammer out.

    It should of been OD divided by tooth count plus 2.
    Translation: I told you to work it out backwards, it should be 40/30+2, so you do get M1.25
    Why PC can't just say that is beyond me. I think he thinks he's funny

    Ew
    1915 17"x50" LeBlond heavy duty Lathe, 24" Queen city shaper, 1970's G Vernier FV.3.TO Universal Mill, 1958 Blohm HFS 6 surface grinder, 1942 Rivett 715 Lathe, 14"x40" Antrac Lathe, Startrite H225 Bandsaw, 1949 Hercus Camelback Drill press, 1947 Holbrook C10 Lathe.

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    Apart for waiting for the crucifiction what part of OD divided by tooth count plus 2 wasnt said.

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    Quote Originally Posted by Ueee View Post
    Translation: I told you to work it out backwards, it should be 40/30+2, so you do get M1.25
    Not if you pay any attention to the precedence of mathematical operators, you don't.

    However 1.25 is the correct answer....

    PDW

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    To go just a little OT. Anyone got a chart that says anything about pitch tolerance? I dont ever recall seeing anything about it, there must be something out there.

    How long a thread do you need and how good does it need to be?
    How about 11tpi with 30 driver 40 driven? I make it 1.732mm............ close enough? I assume not, but I've got nothing to back that up. Over 6 turns thats an error of 0.11mm, I guess it really comes down to what its going to be used for.

    Stuart

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    Quote Originally Posted by Stustoys View Post
    Anyone got a chart that says anything about pitch tolerance? I dont ever recall seeing anything about it, there must be something out there.
    I think you'd need to start looking at national standards and thread tolerances as it would be covered in there. For our purposes I think it comes down to whether the nut fits or jams.

    Michael

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    Quote Originally Posted by Michael G View Post
    I think you'd need to start looking at national standards and thread tolerances as it would be covered in there. For our purposes I think it comes down to whether the nut fits or jams.

    Michael
    I think it is related more to whether the thread breaks or the nut rounds off myself.

    Dean

  15. #14
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    Thanks all for the vigor. M1.25 it is. I will head off and hunt down a cutter.

    Quote Originally Posted by jhovel View Post
    Variant22, where are you?
    I have a full set of Module 1 cutters if you can use them (for a loan). PM me if that turns out to be the right size.
    Thanks for the offer Joe (it turns out it is M1.25). I appreciate the offer.

  16. #15
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    Default Module / DP cutter register

    Maybe we should have a register who's got what cutter sets for gears - I mean us hobbyists of course.
    That way we can quickly know who to contact to get a gear made or a loan of the right cutter.
    Cheers,
    Joe
    9"thicknesser/planer, 12" bench saw, 2Hp Dusty, 5/8" Drill press, 10" Makita drop saw, 2Hp Makita outer, the usual power tools and carpentry hand tools...

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