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Metric threading on 10L ?
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Richard Green
I purchased on ebay a 3D printed compound gear that is supposed to enable metric threading on my Heavy 10.
The gear appears to be printed well, and is equipped with a bronze bushing center for reduced wear and longer life. What I didn't get, however, is any instructions. Can someone give me guidance on how to integrate it into the geartrain, and point me to a spreadsheet or PDF of a new threading/feed chart after the modification? -- Rick Green |
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mike allen
I forgot this was in the files section . See if this helps
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https://groups.io/g/SouthBendLathe/files/Techinfo/Metric%20Threading animal On 2/15/2023 10:58 AM, Richard Green wrote:
I purchased on ebay a 3D printed compound gear that is supposed to |
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m. allan noah
Do you have a double tumbler, or single tumbler gearbox? allan On Wed, Feb 15, 2023 at 1:58 PM Richard Green <rtg@...> wrote: I purchased on ebay a 3D printed compound gear that is supposed to enable metric -- "well, I stand up next to a mountain- and I chop it down with the edge of my hand" |
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Richard Green
Mine is a 1943 production single- tumbler unit. (Pull-knob and top lever as well)
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The gear I purchased is the half-sized one which supposedly fits within the gear cover and can be left in 'permanently', although there is no claimed means for switching it in and out of the gear train as needed. https://www.ebay.com/itm/203101200340 On Wed, 15 Feb 2023, m. allan noah wrote:
Do you have a double tumbler, or single tumbler gearbox? --
Rick Green |
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Richard Green
On Wed, 15 Feb 2023, mike allen wrote:
I forgot this was in the files section . See if this helpsThanks for the link. All those charts appear to be for 9in lathes without QCGB. Still looking. -- Rick Green We, the People of the United States of America, reject the U.S. Supreme Court's Citizens United ruling, and move to amend our Constitution to firmly establish that money is not speech, and that human beings, not corporations, are persons entitled to constitutional rights. http://www.MoveToAmend.org |
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m. allan noah
The single tumbler is not compatible with those gears without a bunch of work. They do not have a banjo that allows the gears to be moved or replaced. IIRC, the existing gears are also a different pitch (18DP maybe?) allan On Wed, Feb 15, 2023 at 3:02 PM Richard Green <rtg@...> wrote: Mine is a 1943 production single- tumbler unit. (Pull-knob and top lever as -- "well, I stand up next to a mountain- and I chop it down with the edge of my hand" |
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Richard Green
You're absolutely correct. I just pulled the gear cover and verified that the gears in my gear train have a smaller DP than this printed conversion gear.
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And a rereading of the papers that were shipped with the grear found a pitch chart for the double-tumbler QCGB only. I'll send a note to the ebay seller, asking him to make this distinction clear in his item description. On Wed, 15 Feb 2023, m. allan noah wrote:
The single tumbler is not compatible with those gears without a bunch of work. They do not have a banjo that allows the gears to be moved or --
Rick Green |
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Erik S.
This is what I found on this issue. I have not made the 34 tooth gear yet, I've bought the cutter set and made the arbor, but other things got in the way.
I've also attached my thread calcs. (my format, my use, no accounting for taste, no promises that it makes sense to anybody else)
Erik S.
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m. allan noah
Yeap, that's me :) The 17 or 34 tooth gear should be close enough for general fastener use. It does depend on the ability to swing the banjo far enough for engagement. I've never tried it myself so I cannot be sure of that. allan
-- "well, I stand up next to a mountain- and I chop it down with the edge of my hand" |
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