Gear Cutter

  1. ford34/2 Member

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    2,284
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    Cramlington,Northumberland. United Kingdom
    ROOFMAN:: are you after a 63T or the 127T I`ll keep my eye open, over a few years never ever seen a 63 for sale but several 127.

    The Harrison Lathe both myself and John (doubleboost) have is the 140 Model with the 36 speed Norton gearbox, easily identified by the 3 selector knobs on the gearbox. The Lathe is an all Metric machine, Dials and Harrison screwcutting information plate are all in Metric.
    The introduction of the 63 translation gear allows the gearbox with the correct changewheel set up to cut imperial threads, with a range from 4 to 60 TPI. To cut this whole range, one changewheel needs to be swapped on the train. So basically 5 changewheels will cut the 4-60 TPI range, although only 4 are in use at any one time.

    I dont see any problem reversing this process to cut Metric threads on an imperial lathe. Using a 63t, or a 127t changewheel -- Not having an imperial lathe I cant test drive my theory. Now a 127T is a big change wheel and comes in at over 91/4" -- can it fit into any banjo setup you have, ?????????????

    Stan
     
    MattF likes this.
  2. roofman

    roofman Purveyor of fine English buckets and mops

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    Stan ile see whats on the machine atm,i dont have any spare wheels at all but remember making a note when i bought it that i had no facility to cut run of the mill threads..cheers
     
  3. ford34/2 Member

    Messages:
    2,284
    Location:
    Cramlington,Northumberland. United Kingdom
    The screwcutting information plate is a copy of the double sided metric one on the front of the box, No its not a Harrison one, it took as long to do as sorting out the gear selection. Its also searchable on Google.
    https://plus.google.com/107784601559913192023/posts/UkdFSF2yrFP

    Heres some pics of the Metric coarse and fine and a copy of the homemade imperial one.

    Stan
     
    • Harrison 140 imperial screwcutting info plate.jpg
    • img1.jpg
    • $_57.JPG
  4. MattF

    MattF Member

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    I'd never thought about it 'til you mentioned it Stan, but logic does dictate it should work in both manners; imperial to metric, metric to imperial.
     
  5. doubleboost

    doubleboost Member

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    It works both ways my last lathe was imperial
    Same set up to cut metric
     
    MattF likes this.
  6. roofman

    roofman Purveyor of fine English buckets and mops

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    never thought how handicapped i am with this metric harrison 11"...all i have is a 120 on the bottom...intermediate of 70 and a top of 20. giving me the only option of a pitch of 0.5:(...to do any usefull thread cutting i need a 100,80,60,55,50,45.:dontknow: Maybe this £425 bargin was,nt so much of a bargin without a set of metric change wheels
     
  7. AndyStobbs Member

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    2,476
    Location:
    North West England
    We are in similar boats, and locations. I have the facilities to machine blanks, as do you. I have a bloody gert milling machine for gear cutting, no dividing head as of yet though. I think between us we can knock up some gears for ourselves on a budget.
     
    ukracer likes this.
  8. AndyStobbs Member

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    Surely your gearbox enables more pitches though Roofman?
     
  9. roofman

    roofman Purveyor of fine English buckets and mops

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    dont have a gearbox Andy...only 3 speeds on my lead
     
  10. roofman

    roofman Purveyor of fine English buckets and mops

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    i have a massive rotary table with a fixed 200mm chuck but can only sit on the horizontal plane
     
  11. AndyStobbs Member

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    Could be set up in the horizontal and feed the table up to take the cut rather than across.
     
  12. lchris21

    lchris21 Member

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  13. roofman

    roofman Purveyor of fine English buckets and mops

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    well thats it then..sorted
     
  14. doubleboost

    doubleboost Member

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  15. nick952

    nick952 Member

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  16. doubleboost

    doubleboost Member

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  17. nick952

    nick952 Member

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  18. doubleboost

    doubleboost Member

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  19. Brad93

    Brad93 M J B Engineering

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    doubleboost likes this.
  20. grim_d

    grim_d Forum Supporter

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    I've been getting emails from this "Alan hearsum" today asking to buy his neice Amazon vouchers. Think his email must have been hijacked...anyone else?
     
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