Gear Cutter

  1. doubleboost

    doubleboost Member

    Messages:
    2,990
    Location:
    Newcastle upon Tyne England
    I am looking for a gear cutter to make some change wheels for My Harrison Lathe
    The size I need is a "14DP to cut 63 teeth" I belive it is the number 2
     
  2. ford34/2 Member

    Messages:
    2,284
    Location:
    Cramlington,Northumberland. United Kingdom
    John,you have PM.
    Stan
     
  3. AndyStobbs Member

    Messages:
    2,476
    Location:
    North West England
    Loads on ebay. Whats the pressure angle on the harrison? Metric change wheels are on my to do list.
     
  4. ford34/2 Member

    Messages:
    2,284
    Location:
    Cramlington,Northumberland. United Kingdom
    yes but sadly 63T and 127T are as rare as hens teeth. I hunted and watched for years and bit the bullet and got one made. ----The cost was £35 + Carriage, cheaper than s/h. he had it cast, then machined the blank and then took it to a gear cutter.


    Stan
     
  5. doubleboost

    doubleboost Member

    Messages:
    2,990
    Location:
    Newcastle upon Tyne England
    14 1/2 deg 14 DP I can only find a full set in China
     
  6. MattF

    MattF Member

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    10,297
    Location:
    South Yorkshire, England
    That's the same setup as Drummond gears?
     
  7. AndyStobbs Member

    Messages:
    2,476
    Location:
    North West England
    Thats good, who was that from?
    I was going to get a 127T timing belt from a citroen, make a plywood/mdf disc to mount it on and index from that to cut my own.
    Lot of effort for £35 + carriage.
     
  8. ford34/2 Member

    Messages:
    2,284
    Location:
    Cramlington,Northumberland. United Kingdom
    Note the Date, but contact Alan and double check.Any other info is in this E mail copy.
    Stan

    From:
    "alanhearsum@btinternet.com" <alanhearsum@btinternet.com>
    To: Stan Gordon
    Sent: Sunday, 15 September 2013, 15:45
    Subject: Re: Want a 63T tooth gear-Harrison 140
    Hello Stan
    Glad you made a bid on the gear on ebay. I shall start machining the 63 tooth gear on Monday 16th. I will then take it to the gear cutters on Tuesday. Normally they take a couple of days so you should have it posted to you next week. I will weigh for postage and let you know total cost. Blank will be £10+Machining £10 + Gear cutting probably £15 = £35 + postage.
    I will keep you informed cash will be alright providing you wrap in cardboard. I will let you know cost it should not vary that much from this quote.
    Regards
    Alan

    I could make you one and get it gear cut for you in Sheffield. I guess you know that an 127 tooth gear 14dp x 14.5 degree pressure angle x 5/8 inch face width x 5/8 inch bore is 9.274 inches outside diameter. Does the Drummond have room to work with such a large gear? Let me have your email address if you are interested.
    Best of luck
    Alan Hearsum, Rats Castle, Dale End, Bradwell, Hope Valley, Derbyshire S33 9HP.
     
  9. AndyStobbs Member

    Messages:
    2,476
    Location:
    North West England
    So you went for 63T in the end Stan?
     
  10. ford34/2 Member

    Messages:
    2,284
    Location:
    Cramlington,Northumberland. United Kingdom
    Yes I got a 127T from a local tool/engineering supplier in Jarrow. The rest of my set of changewheels from Online sellers, E bay and Jumbler classifieds, its taken several years to get a full set, sadly they were all missing when the lathe arrived.
    Th 63 was used to work out the feed and gearbox combinations to cut imperial threads, I have been told this is a no go solution and the 127 is the way to go, when time allows I`ll try and see if the 127 can be introduced in favour of the 63.----on the to do list, for short threads it seems spot on, over a descent length maybe not so accurate, I dont realy know.

    Stan
     
  11. roofman

    roofman Purveyor of fine English buckets and mops

    Messages:
    7,472
    Location:
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    ime on the same hunt Stan but added complication as my Harrison is Metric..
     
  12. doubleboost

    doubleboost Member

    Messages:
    2,990
    Location:
    Newcastle upon Tyne England
    I will be making a 63 once I find a cutter
    Could make a few if the demand was there
     
    ukracer likes this.
  13. AndyStobbs Member

    Messages:
    2,476
    Location:
    North West England
    Would've thought it would either be a good thread or a bad one. If it cuts an inch of good thread it'll cut a yard, not the kind of thing that would compound any error.
    I got no change wheels with mine, but it does have a comprehensive gearbox.
     
  14. MattF

    MattF Member

    Messages:
    10,297
    Location:
    South Yorkshire, England
    Don't you mean metric threads? There was a discussion on the list a while ago regarding that. Apparently the difference in real life between the 63 and the 127 is inconsequential. Leadscrew wear would likely throw more error into the thread than the 63/127 aspect would.
     
    eLuSiVeMiTe likes this.
  15. roofman

    roofman Purveyor of fine English buckets and mops

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    that would be great John...would this enable me to cut imp or metric?
     
  16. AndyStobbs Member

    Messages:
    2,476
    Location:
    North West England
    Hpc can supply you a cutter db.
     
  17. ronan

    ronan Member

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    9,942
    dublin
  18. Pete.

    Pete. Member

    Messages:
    9,435
    Location:
    Kent, UK
    127 teeth is used for perfect interpolation but 63/64 being half that is so close that it is often used in a standard set of change-gears. Here's a chart for gear combinations for an Atlas lathe.

    gearcuttingchart.gif
     
    pressbrake1 likes this.
  19. doubleboost

    doubleboost Member

    Messages:
    2,990
    Location:
    Newcastle upon Tyne England
    Have you a link
     
  20. doubleboost

    doubleboost Member

    Messages:
    2,990
    Location:
    Newcastle upon Tyne England
    It converts ether way you need some other gears but these are availabl
    This video shows how to set it up
     
    ford34/2, MattF and roofman like this.
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