Hardinge TL (and HLV ?) Metric Threading - Page 2
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  1. #21
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    I received the following quotation from a Boston Gear Works distributor:

    GA20 - 20 teeth 3/8" face, 5/8" bore, 1/8" keyway - $16.81

    GA24 - 24 teeth 3/8" face, 5/8" bore, 1/8" keyway - $18.80

    GA28 - 28 teeth 3/8" face, 5/8" bore, 1/8" keyway - $20.13

    GA40 - 40 teeth 3/8" face, 5/8" bore, 1/8" keyway - $23.44

    GA45 - 45 teeth 3/8" face, 5/8" bore, 1/8" keyway - $24.86

    GA50 - 50 teeth 3/8" face, 5/8" bore, 1/8" keyway - $25.75

    All Boston Gear Works gears are 14.5 PA.

  2. #22
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    Here ...





    ... is a metric threading chart for the TL, using the approach described earlier.

    A larger version may be found Here.

  3. #23
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    I have revised the TL (and HLV) Threading Chart to order it by predicted wear, where there exists more than one choice for a specific pitch.

    The order is now ascending by pitch (as it was before) and descending by teeth count (this is the present change), so as to minimize gear teeth wear, as those solutions which have greater teeth will appear first in the chart.

    MS Excel is not smart enough to allow data sorts on four keys, so the chart is necessarily: 1) by pitch (ascending), 2) by "first" gear (descending) and 3) by "third" gear (descending).

    It is my intention to setup my TL primarily for metric threading.

    This makes sense (to me, anyway) as: 1) if the banjo is not mounted, the lathe immediately reverts to Imperial threading, and 2) if the banjo is mounted, the lathe immediately selects metric threading.

    I have an Imperial/metric Logan, but this is not a super-precision lathe.

    I have two 10EEs, but only one has threading capability, and it is Imperial; the other is a so-called "manufacturing" 10EE, the functional equivalent of a Hardinge TFB (turn/face/bore) lathe.

    Additionally, I have sized the chart so that it can be printed on U.S. standard letter size paper, without resizing.

  4. #24
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    Here ...





    ... is a complete table of all metric pitches which can be produced using a 127 T 40 DP transposer (second gear) with 70 T and 80 T first gears and 20 T, 24 T, 28 T, 40 T, 45 T and 50 T 20 DP third and fourth gears.

    The pitches which are shown in bold are the conventional and model maker's pitches.

  5. #25
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    Peter,

    Excellent work thanks.

    Is there any chance you could post a picture of the set-up, just to clarify how it's set on the banjo etc.?

    Regards,

    Bill

  6. #26
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    I'm another Pete(r), not the clever one who worked it out :-)

    Just been corresponding with Bill re PM and as I happened to have a pic of the setup for 2mm threads thought I may as well post it for reference. This is using the original scheme, as posted in the first message of this thread, with a 37/47 transposer. It is using Myford-type 20 DP gears throughout (mostly cheap imports from RDG as per previous message) and the original (Imperial) banjo which came originally with my HLV (narrow bed).




  7. #27
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    Cheers Pete,

    A picture makes things so much clearer

  8. #28
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    hi i am new hear and have seen the tread on metric threading and i am looking for a metric banjo for my hardinge if any one has one for sale e mail me [email protected] thanks john

  9. #29
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    It's not too difficult to make one:
    Attached Thumbnails Attached Thumbnails hardinge1.jpg  

  10. #30
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    hi thanks i know what i am going to be doing later on this week end i will be making one thanks for that john

  11. #31
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    Default Getting set to order my set of metrication gears

    Quote Originally Posted by peterh5322 View Post
    I received the following quotation from a Boston Gear Works distributor:

    GA20 - 20 teeth 3/8" face, 5/8" bore, 1/8" keyway - $16.81

    GA24 - 24 teeth 3/8" face, 5/8" bore, 1/8" keyway - $18.80

    GA28 - 28 teeth 3/8" face, 5/8" bore, 1/8" keyway - $20.13

    GA40 - 40 teeth 3/8" face, 5/8" bore, 1/8" keyway - $23.44

    GA45 - 45 teeth 3/8" face, 5/8" bore, 1/8" keyway - $24.86

    GA50 - 50 teeth 3/8" face, 5/8" bore, 1/8" keyway - $25.75

    All Boston Gear Works gears are 14.5 PA.
    I've gotten HPC gear to quote 20 pitch gears with the right bores. The prices are in pounds. RDGtools is a better source for all but the 22 and 24 tooth gears and the 48 pitch gears.
    Teeth HPC gear
    70 29.65
    80 32.91
    127 43.33

    20 pitch
    20 20.61
    22 20.88
    24 21.24
    28 21.71
    30 21.89
    40 23.34
    45 23.95
    50 24.75
    60 26.04

    If someone out there is interested in a set, PM me.

    Regards,
    Rod

  12. #32
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    Default

    english-threads-using-metric-gear-set-croppe.jpg
    Something really important; the metric set will also allow you to make a bunch of useful english threads too: 4,5,6,7,8,9,10,25,45,75,90, and 100. These are all done using TWO idlers; an unusual configuration, but it gives some nice thread pitches. Here's all the english threads (that aren't in the quick change) you can make with the metric gear set. 8 and 10 are the ones you would want the most.

    Regards,
    Rod

  13. #33
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    All,
    I got a set of Boston change gears in last night. They fit the Hardinge gear shafts a little bit more tightly than the stock gears. I set up a gear train and ran it; works smoothly!

    I set up a wishlist with the right gears on it:
    Amazon.com
    I think you can also search Amazon for a wishlist called "Hardinge metrication gear set"

    You will still need to source the three, 48 pitch transposing gears, though.

    Regards,
    Rod

  14. #34
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    If any one buying these gears needs the metric Bajo there is a PM member that has a CNC program to make them. He tried selling complete converions with the gears, but there was no interest. Maybe some of you want or need a ready made banjo? If so I will post his contact info.

  15. #35
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    Quote Originally Posted by FredC View Post
    If any one buying these gears needs the metric Bajo there is a PM member that has a CNC program to make them. He tried selling complete converions with the gears, but there was no interest. Maybe some of you want or need a ready made banjo? If so I will post his contact info.
    I understand that, with Rod's design with the 48 DP transposing gears, you do not need the metric banjo.

    If anyone wants a standard banjo and the 10 TPI gears, i think I have one or two for sale.

    Larry

  16. #36
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    I'm trying to find a standard banjo (with the shafts that the gears change gears live on -- I have no trouble finding "naked" banjos or the drawings for them, but I'd still need the shafts for the gears as well) -- Larry, if you have a banjo with shafts for sale, I'm interested. I have an HLV-BK.

    --Andrew

  17. #37
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    Bringing this post back up in case anyone has a need to do metric threading on their "English" Hardinge using an English banjo and a set of transposing gears. Back in 2014 we made up a batch of the 48DP transposing gears- 50, 70 and 127 teeth (see reply #17 and #33 above except we went with 48 DP rather than 40).
    I still have a few of these 3 gear sets available if anyone is interested. $125.00 shipped in the US via USPS priority mail. PM me or dmcgearsATyahooDOTcom. Thanks, Dan

  18. #38
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    What are the Boston Gear part numbers for the 70 and 80 tooth gears?

  19. #39
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    Boston Gear gave me GA70B and GA80B (cast iron) for the gear numbers.

  20. #40
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    Bringing this post back up in case anyone has a need to do metric threading on their "English" Hardinge using an English banjo and a set of transposing gears. Back in 2014 we made up a batch of the 48DP transposing gears- 50, 70 and 127 teeth (see reply #17 and #33 above except we went with 48 DP rather than 40).
    I still have a few of these 3 gear sets available if anyone is interested. $125.00 shipped in the US via USPS priority mail. PM me or dmcgearsATyahooDOTcom. Thanks, Dan


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