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7x treading capabilities
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I was brousing information on threading capabilities on the 7x SIEG lathes. I was referred to the lathe comparison page on the LMS website at .
I noticed the threading column lists a capability of 28 threads for the LMS HiTorque and 18 threads for all other listed SIEG lathes. How is this done? Does the 28 threads include the metric threads possible with the addition of a 21 tooth change gear? A 32 tooth change gear? Or are the gears in the drive train of the HiTorque different than the other SIEG lathes? I do understand there is no high/low gear in the HiTorque geer train. What I'm trying to figure out is , can I increase the threading capability of my MicroMark 7 x 14 to 28 threads by adding 21 and 32 tooth gears as mentioned on Or am I totaly confused and need another cup of coffee? Chuck |
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Chuck, my guess is that?the LMS?HiTorque will cut a bigger range of inch threads than the standard Sieg C3. The comparision chart quotes?from 4 to 80 tpi as opposed to 12?to 52 tpi. ? As a general rule, a greater variety of change gears will increase the range of threads you can cut. I presume the leadscrew pitch is the same, so if the HiTorque gear set is the standard one plus 21T and 32T, adding those to your standard set should give you the same choice of threads. ? 4 tpi must be hard going, definitely needing a?handcrank, though with the gearing?4:1 against you,?cranking the leadscrew might be better.??And it might be easier?to use a die for some of the finer threads. ? ? Andy ? To: 7x12minilathe@... From: chunk07@... Date: Wed, 14 Nov 2012 15:57:22 +0000 Subject: [7x12minilathe] 7x treading capabilities ?
I was brousing information on threading capabilities on the 7x SIEG lathes. I was referred to the lathe comparison page on the LMS website at
I noticed the threading column lists a capability of 28 threads for the LMS HiTorque and 18 threads for all other listed SIEG lathes. How is this done? Does the 28 threads include the metric threads possible with the addition of a 21 tooth change gear? A 32 tooth change gear? Or are the gears in the drive train of the HiTorque different than the other SIEG lathes? I do understand there is no high/low gear in the HiTorque geer train. What I'm trying to figure out is , can I increase the threading capability of my MicroMark 7 x 14 to 28 threads by adding 21 and 32 tooth gears as mentioned on Or am I totaly confused and need another cup of coffee? Chuck |
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--- In 7x12minilathe@..., Andy Franks <andyf.1108@...> wrote:
I presume the leadscrew pitch is the same, so if the HiTorque gear set is the standard one plus 21T and 32T, adding those to your standard set should give you the same choice of threads. That's what I'm trying to determine. Chris W., does the HiTorque come with a 32 tooth change gear? Chuck |
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It looks like the expanded threading capacity comes from going farther on the table of cuttable threads! If you look in the "files" section, you'll find tables showing that just about every integer thread pitch and reasonable metric approximations can be cut with the gears normally supplied. By adding a 21 tooth gear, several of the metric approximations are a little closer. Without a 21 tooth gear, usable threads are easy enough to cut.
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There are a few possible pitches that run into set up problems because the needed gears don't fit into the normal spacing rules: 72<A+B<134 88<C+D<138 Roy --- In 7x12minilathe@..., "chucketn" <chunk07@...> wrote:
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