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left hand thread cutting
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The premium content article is good. I learned to thread at my school on the lathe, but i subscribed to the article anyways. The only thing i did not like was the setup explanation. The drivetrain explanation is good, but its the tool setup i did not like. Like using the center gage to make sure the tool is perpendicular and centered.
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gerry waclawiak wrote: you need to subscribe to the premium content either for the article or for |
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Has anybody cut left hand threads using their mini lathe?
I am making a new leadscrew for this lathe, 7/16-20. At school i threaded a left hand screw for the first time, but this is an industrial machine. I could wait until monday to cut my leadscrew, but im feeling impatient.What has been peoples reactions to left hand threads cut on this machine? -Bernard |
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As long as the compound handle doesn't run into the HS, it's no
different. If you're near a decent fastener place, you can probably buy 7/16-20 LH threaded rod. You'll have to figure out a way to attach the thrust collar. Roy --- In 7x12minilathe@..., Bernard Goguelet <phantomcow3@c...> wrote: industrial machine. I could wait until monday to cut my leadscrew, but imfeeling impatient.What has been peoples reactions to left hand threads cut on |
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Yep, I made a new 10X1mm left hand lead screw for the cross slide on
my old style Homier. I used 9/16" oil hardening (although I didn't harden the screw) drill rod. I made it 3/4" longer than standard and .007" larger in diameter. It cut very smoothly and turned out perfect. I did first order a 21 tooth gear from Uncle Rabid and I made (and used) a hand crank for the threading operation. No problem at all. Since you're doing 20 tpi you won't need any special gears. A standard thread file or 7/16" LH die will make the final clean up much smoother. Make sure your tailstock center is in perfect alignment with your headstock. You do not want ANY taper.) --- In 7x12minilathe@..., Bernard Goguelet <phantomcow3@c...> wrote: industrial machine. I could wait until monday to cut my leadscrew, but im feeling |
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Bruce Leo Hartmann wrote:
Yep, I made a new 10X1mm left hand lead screw for the cross slide onwell, I decided i will use the lathe at school. I dont trust my headstock and tailstock alignment just yet. And the one at school has a taper of .002 over 24". Considering my new leadscrew is not even half of that, i can live with it :). -Bernard |
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Amaradio William A Jr
Bruce, Can you explain How you cut threads, left or
right on a lathe. I understsnd that the lead screw controls the pitch of the thread. but how do you cut a thread and spiral to the next thread? Do you back off the 29.5degree cutting tool by visual observation?I understand this is why there is a a thread dial on a lathe. Many machinists don't use them, How do they cut threads? Are there any simple .easy to understand ,step by step books or articles on threading . I own a Cummins 7x10 and a Jet 9x20 and can't cut threads on either of them. Thankyou Bill Amaradio --- Bernard Goguelet <phantomcow3@...> wrote: Bruce Leo Hartmann wrote:------------------------------------------------------------------------Yep, I made a new 10X1mm left hand lead screwfor the cross slide onmy old style Homier. I used 9/16" oil hardening(although I didn'tharden the screw) drill rod. I made it 3/4" longerthan standard and.007" larger in diameter. It cut very smoothly andturned out perfect.I did first order a 21 tooth gear from Uncle Rabidand I made (andused) a hand crank for the threading operation. Noproblem at all.Since you're doing 20 tpi you won't need anyspecial gears. A standardthread file or 7/16" LH die will make the finalclean up muchsmoother. Make sure your tailstock center is inperfect alignment withyour headstock. You do not want ANY taper.)Goguelet <mailto:7x12minilathe-unsubscribe@...?subject=Unsubscribe>YAHOO! GROUPS LINKS<>" on ------------------------------------------------------------------------Yahoo! Terms of well, I decided i will use the lathe at school. I --------------------------------------------------------------------~->
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Stephen Harrison
I found it worth the money to purchase the premium content article from mini-lathe.com on threading. I am a complete n00b but i was able to make successful right-hand threads without using a die on aluminum and drill rod (1/4-20, M6x1.0, M10x1.5) after my first few failed attempts.
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Stephen Bruce, Can you explain How you cut threads, left or |
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John
In the 7x12 Files see the folder titled "Half Nuts + Threading". There
is a procedure there that you may find helpful. I would add a couple of things to that procedure: (1) When engaging the half nuts, choose any number you like and then ALWAYS engage on that number. Then, you don't need to remember the rules about odd/even/half tpi - it takes a trifle longer to wait for the number to come around but it is easy to remember and will work for inch threads. (For metric threads, it is simplest to keep the half nuts engaged, back the tool out and wind the chuck backwards - this works for all threads.) (2) You can thread without using power, turning the chuck by hand if you don't have a handwheel. This works fine for short threads: I use power only when making especially long threaded items (e.g. a leadscrew). Hand powered threading can be done in slow motion which allows plenty of time to stop if things are going awry so it is a great way to experiment and learn. John --- In 7x12minilathe@..., Amaradio William A Jr <wamarad@s...> wrote:
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MAC
hi
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where can i find that article i have looked till i'm googley eyed?? thanks mack -----Original Message-----
From: Stephen Harrison <msteveharrison@...> Sent: Oct 17, 2005 7:29 AM To: 7x12minilathe@... Subject: Re: [7x12minilathe] Re: left hand thread cutting I found it worth the money to purchase the premium content article from mini-lathe.com on threading. I am a complete n00b but i was able to make successful right-hand threads without using a die on aluminum and drill rod (1/4-20, M6x1.0, M10x1.5) after my first few failed attempts. Stephen Bruce, Can you explain How you cut threads, left or Be sure to check out for small mills and lathes. Yahoo! Groups Links MAC |
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gerry waclawiak
you need to subscribe to the premium content either for the article or for
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the whole lot. Very good for a newbie I subscribed myself for my first year Gerry Leeds, UK ----- Original Message -----
From: "MAC" <macmars@...> To: <7x12minilathe@...> Sent: Monday, October 17, 2005 4:35 PM Subject: Re: [7x12minilathe] Re: left hand thread cutting hi< raft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=ODVBtgNE3bFOb PcFi90__Q> <Hobby and craft supply =Hobby+and+craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=9 6dhczNkLwbd_-RUV12_Pw> <Craft hobby craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=jBnWLXa70lcN uQNNYr314g> < by+and+craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=aLHJt LKiOfK8ELoH_Wmv1Q> <mailto:7x12minilathe-unsubscribe@...?subject=Unsubscribe> lathes. Yahoo! Groups Linkslathes. Yahoo! Groups Links |
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MAC
where???
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-----Original Message-----
From: gerry waclawiak <gerry.waclawiak@...> Sent: Oct 17, 2005 1:24 PM To: 7x12minilathe@... Subject: Re: [7x12minilathe] Re: left hand thread cutting you need to subscribe to the premium content either for the article or for the whole lot. Very good for a newbie I subscribed myself for my first year Gerry Leeds, UK ----- Original Message ----- From: "MAC" <macmars@...> To: <7x12minilathe@...> Sent: Monday, October 17, 2005 4:35 PM Subject: Re: [7x12minilathe] Re: left hand thread cutting hi< raft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=ODVBtgNE3bFOb PcFi90__Q> <Hobby and craft supply =Hobby+and+craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=9 6dhczNkLwbd_-RUV12_Pw> <Craft hobby craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=jBnWLXa70lcN uQNNYr314g> < by+and+craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=aLHJt LKiOfK8ELoH_Wmv1Q> <mailto:7x12minilathe-unsubscribe@...?subject=Unsubscribe> lathes. Yahoo! Groups Linkslathes. Yahoo! Groups Links Be sure to check out for small mills and lathes. Yahoo! Groups Links MAC |
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LOL, well I'll try. I only cut left handed threads once and that
was over a year ago. I think it was just luck that my screw came out perfect. On both right and left threads you still cut on the front side which means the cutting happens when the spindle is turning towards you. The only difference is that in a left handed thread you start cuts at the head stock end and set the carriage to move towards the tail stock as the spindle revolves in its normal forward manner. The tool bit just rides in the cut groves when you crank the spindle backwards to the beginning of the cut before you advance again. Since I used a handcrank I never had to back out the cutter bit (60 degree point held 90 degrees to the stock being cut) and I've never had to use the threading dial. If you're using a HSS bit you'll want to have the compound set at 29.5 degrees to the left. If you're using a carbide cutter then you MUST have the compound set at zero degrees or you'll break off the tip of your tool when you crank in reverse to come back to the starting point even if you are only advancing .001" for each cycle of the carriage. (If you're using the threading dial and retracting the bit during the return stroke you can safely off set the compound to 29.5 degrees even with a carbide cutter.) Hand cranking a long screw (like a lead screw) is long HARD work that will give your arm a workout but there is a much less chance of making a mistake. There are charts that tell you how far you'll need to advance your bit. If you're coming in at 29.5 degrees you'll need to advance the bit twice as far as opposed to coming in at zero degrees on the compound. The easiest way to gage how close you are to being finished is to use a test nut when your screw starts looking almost finished. In the case of a left handed lead screw thread, simply buy a spare cross slide nut before you start and use it as your gage. In the case of a right hand thread, just obtain the proper size regular nut before you start. After you finish a cut and it seems you're getting close to the final size, back out your tail stock center and see if your nut will start on the thread. A very tight rough fit is good. At that point you only need to smooth up your thread with a threading file or proper sized die to get a perfectly made screw. If you have neither a file nor die, just go through several cycles without advancing the bit and then clean up your threads with a wire brush followed by a little light fine sanding to polish the OD of the threads. Newly cut threads can also be lapped for a really perfect (very smooth) fit. Just coat your thread with a very fine abrasive (automotive chrome polish works well) and run your nut up and down the thread. (This lapping operation is preformed after you remove the screw from the lathe.) Clean and oil your new screw and you're all finished. My first try at making a left handed cross slide lead screw turned out perfect. After that I decided to make a perfect (right hand thread) compound lead screw. It that case I ended up with FIVE (5) bad (undersized) screws before I succeeded in making a perfect screw. I guess the stars and planets weren't aligned right for first time perfection on that job. Sometimes thread cutting can be challenging and very frustrating. --- In 7x12minilathe@..., Amaradio William A Jr <wamarad@s...> wrote:
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The center gage is designed to help with tool setting; that's what
the 60° notches in the sides are for. It's a bit more accurate if you don't bottom the tool out in the notch but check each side individually by sliding the gage along the work. Roy --- In 7x12minilathe@..., Bernard Goguelet <phantomcow3@c...> wrote: school on the lathe, but i subscribed to the article anyways. The only thingi did not like was the setup explanation. The drivetrain explanation isgood, but its the tool setup i did not like. Like using the center gageto make sure the tool is perpendicular and centered.article or for firstthe whole lot. Very good for a newbie I subscribed myself for my eyed??year article from able to makemini-lathe.com on threading. I am a complete n00b but i was and drillsuccessful right-hand threads without using a die on aluminum attempts.rod (1/4-20, M6x1.0, M10x1.5) after my first few failed ------------------------------------------------------------------------ subject=Unsubscribe><mailto:7x12minilathe-unsubscribe@...?YAHOO! GROUPS LINKS<>" on ------------------------------------------------------------------------Yahoo! Terms of small millswell, I decided i will use the lathe at school. I t=ms&k=Mini+lathe&w1=Mini+lathe&w2=Hobby+and+c<and lathes. t=ms&k=Mini+lathe&w1=Mini+lathe&w2=Hobby+and+c>< raft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=ODVBtgN E3bFOb t=ms&k=Hobby+and+craft+supply&w1=Mini+lathe&w2PcFi90__Q><Hobby and craft supply t=ms&k=Hobby+and+craft+supply&w1=Mini+lathe&w2>< =Hobby+and+craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85& .sig=9 t=ms&k=Craft+hobby&w1=Mini+lathe&w2=Hobby+and+6dhczNkLwbd_-RUV12_Pw><Craft hobby t=ms&k=Craft+hobby&w1=Mini+lathe&w2=Hobby+and+>< craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=jBnWLX a70lcN t=ms&k=Hobbies+and+crafts&w1=Mini+lathe&w2=HobuQNNYr314g>< t=ms&k=Hobbies+and+crafts&w1=Mini+lathe&w2=Hob>< by+and+craft+supply&w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig =aLHJt ------LKiOfK8ELoH_Wmv1Q>------------------------------------------------------------------ web.YAHOO! GROUPS LINKS subject=Unsubscribe><mailto:7x12minilathe-unsubscribe@...? Terms of ------------------------------------------------------------------------Service <>. millsmills and t=ms&k=Mini+lathe&w1=Mini+lathe&w2=Hobby+and+craft+supply&w3=Craft+hoband lathes. by&w4=Hobbies+and+crafts&c=4&s=85&.sig=ODVBtgNE3bFObPcFi90__Q> t=ms&k=Hobby+and+craft+supply&w1=Mini+lathe&w2=Hobby+and+craft+supply&Hobby and craft supply w3=Craft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=96dhczNkLwbd_- RUV12_Pw> t=ms&k=Craft+hobby&w1=Mini+lathe&w2=Hobby+and+craft+supply&w3=Craft+hoCraft hobby bby&w4=Hobbies+and+crafts&c=4&s=85&.sig=jBnWLXa70lcNuQNNYr314g> t=ms&k=Hobbies+and+crafts&w1=Mini+lathe&w2=Hobby+and+craft+supply&w3=C raft+hobby&w4=Hobbies+and+crafts&c=4&s=85&.sig=aLHJtLKiOfK8ELoH_Wmv1Q> ------ subject=Unsubscribe>YAHOO! GROUPS LINKS ------ |
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Here:
Roy --- In 7x12minilathe@..., MAC <macmars@e...> wrote: or for the whole lot. Very good for a newbie I subscribed myself for myfirst year eyed??
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you need to subscribe to the premium content either for the article Here: I am currently in a lathe class and getting VERY little out of it as far as the correct way of how to. Four weeks in and I really haven't learned anything from the class yet. The instructor just doesn't teach. So, I'm looking for some some books/projects/instruction. The above website looks good and I am considering paying for the premium service. But before I do, are there any other web sites that you would recommend? Thank you. Edward |
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Edward,
there is a lot of stuff on the general www.mini-lathe.com website and even more to be gained by following through the links that are on the link pages. Several of them are broken (I e-mailed Frank Hoose a while ago about this and he quite rightly said he'd rather spend time in his shop than fix broken Links!)but there is an awful lot of good stuff, a lot if it step by step explanations with photos and drawings. The premium stuff on the site is also very detailed and full of photos - very much a step-by-step idiots guide and at only 25 bux a year (I downloaded it all and have a printed file 3" thick!)it is a real bargain. Apart from a couple of years at school doing general metalwork with little lathe time some 30+ years ago I have had no training at all and I am self taught through buying a mini lathe and mill and following the mini-lathe site and links and of course the 7x yahoo groups. I strongly recomment you go right through the site, subscribe to the Premium stuff and then browse all the links - it certainly worked for me. best regards Gerry Leeds, UK ============================================================ From: plasmacobalt@... Date: 2005/10/18 Tue PM 01:06:02 GMT To: 7x12minilathe@... Subject: Re: [7x12minilathe] Re: left hand thread cutting you need to subscribe to the premium content either for the article Here: I am currently in a lathe class and getting VERY little out of it as far as the correct way of how to. Four weeks in and I really haven't learned anything from the class yet. The instructor just doesn't teach. So, I'm looking for some some books/projects/instruction. The above website looks good and I am considering paying for the premium service. But before I do, are there any other web sites that you would recommend? Thank you. Edward Be sure to check out for small mills and lathes. Yahoo! Groups Links ============================================================ ----------------------------------------- Email sent from www.ntlworld.com Virus-checked using McAfee(R) Software Visit www.ntlworld.com/security for more information |
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