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  1. 14th January 2015, 10:31 PM #1
    bob ward
    bob ward is offline Senior Member
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    Default Need a 38 tooth change gear for Hafco AL340 lathe

    My AL340 comes with change gears to cut a wide range of threads, but it can't cut 19TPI (1/4" & 3/8" BSP). Is someone on here who cuts gears able to cut a 38TPI gear for me? No rush, next time you are doing a batch of gears sort of thing.

    I know you need more info than this, but to start the ball rolling, the 40 tooth change gear has a diameter of 42.2mm. I'd send one of the existing change gears, presumably the necessary cutter information etc can be derived from that. I doubt that the gears are made of anything exotic, and there is certainly no sign that the teeth have been heat treated.

    I can supply the blank(s) if that helps.

    PM me, or reply here, or email r-j-wardatbigponddotcom
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  3. 15th January 2015, 12:46 AM #2
    pipeclay
    pipeclay is offline GOLD MEMBER
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    Default

    Let me know if you have no luck,no need to supply a sample but if you supply a blank I require a 9/16" or 5/8" reamed hole in the blank.
  4. 15th January 2015, 09:19 AM #3
    zimma
    zimma is offline Novice
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    Default

    Sounds like MODULE 1.0. You should find that the OD of all of your gears are the tooth count + 2mm.

    I did read somewhere else that the AL340 comes with MODULE 1.25 gears, which would make the OD of the 40 tooth gear 52.5mm, which definately doesn't sound right. MODULE 1 comes out at 42mm.

    You might be able to find these off the shelf somewhere if you can alter the bore to suit.

    Graham
  5. 15th January 2015, 09:58 AM #4
    pipeclay
    pipeclay is offline GOLD MEMBER
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    After reading the last post and checking this morning I only have M1.25 cutters so cant help,they must of changed the module size on the 340 somewhere down the track.
  6. 15th January 2015, 03:30 PM #5
    bob ward
    bob ward is offline Senior Member
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    Default 40 tooth is 52.4mm

    Mumble...lame excuse.....mumble. Apologies, a 40 tooth gear has an OD of 52.4mm. Thanks for the replies and interest.
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