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Re: chatter
Is the tool properly shaped for brass? Brass needs 0 top rake; if there's any top rake the tool will try to pull into the work.
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Roy --- In 7x12minilathe@..., William McBride wrote:
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Re: Opinion of Harbor Freight 8x12 lathe.
¿ªÔÆÌåÓýLOVE MINE!!!..
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I would check out fignoggle.com for a nice review of it.. and
comparrison pics of it next to the 7x lathe..
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while still being a 'bench top' machine.. its got some nice
weight/beef behind it..
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no variable speed m otor though.. (if that matters to you like
the 7x)..
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Im a noob machinist though.. (for a bit of background)..?
either way I realy enjoy mine...
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Re: chatter
MERTON B BAKER
MessageI've found the 14" bed on the 7x12 long enuf, & even the 10" one on
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the 7x10 with the chuck off and using 3C collets is long enuf, too. I agree about the camlock TS clamps & made 'em for my 7x lathes and for the 9x20 also, which is much more limited in the TS department than the 7xs are, and really needed the modification. The "inch" scales on the regular 7xs are as useful as any, I use 'em only for approximations and measure with the dial caliper when I get close. The money I don't spend on the machine buys tools & materials. Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of Michael Jablonski Sent: Tuesday, February 12, 2013 4:43 PM To: 7x12minilathe@... Subject: RE: [7x12minilathe] chatter The situation with the Micromark 7x16 is that because of its size, it is too heavy to be shipped in one carton fully assembled. This means that in order for UPS or like carriers to ship it, the machine needs to be unassembled and packed into two boxes so each box is under the weight limit for shipping. Micromark removes the entire carriage assembly from the bed in this process, and relies on the buyer to re-install the carriage and adjust the carriage gibs. While they do provide instructions for this assembly and adjustment, adjusting the gibs is often a process that many people are unfamiliar with, and so they probably don't get adjusted properly the first time around. I too rushed through this step with my Micromark 7x16 when I first assembled it in a hurry to get it up and running. I even completely jumped over the step in the instructions which was to install a plastic piece shield to keep the wiring off of the lead screw. The compound and cross slide gibs on my machine did not require adjustment out of the box, but I did have to loosen the carriage gibs in order for it to slide onto the bed. I doubt that Micromark goes over each machine when they receive it. Mine appeared to be in the same box that it left China in. The only advantages of a Micromark that I can see is the longer 16 inch bed, the brushless motor, the cam lock tailstock, and the "True Inch" compound and cross slide screws and dials. Whether or not the quality of the machine is actually better than any other SIEG lathe is up for debate. Michael - USA Micro-Mark MicroLux 7x16 -----Original Message----- From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of MERTON B BAKER Sent: Tuesday, February 12, 2013 4:06 AM To: 7x12minilathe@... Subject: RE: [7x12minilathe] chatter Doesn't the MM catalog tell us that their lathes are carefully gone over and meticulously adjusted before they go out the door? Haven't read their catalog for a couple of years. Mert -----Original Message----- From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of george curtis Sent: Monday, February 11, 2013 10:29 PM To: 7x12minilathe@... Subject: Re: [7x12minilathe] chatter my mm 16 was so loose it near clunked. weather cought up with me so not finished adj with shims. george ---------------------------------------------------------- From: Michael Jablonski To: 7x12minilathe@... Sent: Mon, February 11, 2013 5:31:31 PM Subject: RE: [7x12minilathe] chatter Those set screws with the lock nuts are factory set, which means nothing depending on who set them at the factory. Mine were set correctly so I never needed to adjust them. If when you lift up on the front and rear of the carriage and it does not move, but the carriage can still slide the entire length of the bed freely, then the carriage is probably adjusted correctly. What you did was not a mistake, just a little extra learning experience. Michael - USA Micro-Mark MicroLux 7x16 -----Original Message----- From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of William McBride Sent: Monday, February 11, 2013 5:13 PM To: 7x12minilathe@... Subject: RE: [7x12minilathe] chatter I have already changed the set screws with the lock nuts trying to get down to the 1 mil gap is that .001 inch? I have about .008 gap at front of saddle maybe .005 at back. I gave up spent a few hrs working on it needed to quit for tonight.The saddle moves very nicely seems to have no play haven't tried a cut yet. Did I make a mistake touching the set screws its very frustrating to adjust. Bill |
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Re: chatter
¿ªÔÆÌåÓýThe
situation with the Micromark 7x16 is that because of its size, it is too heavy
to be shipped in one carton?fully assembled. This means that in order for
UPS or like carriers to ship it, the machine needs to be unassembled and packed
into two boxes so each box is under the weight limit for
shipping.
?
Micromark removes the entire carriage assembly from the bed in this
process, and relies on the buyer to re-install the carriage and adjust the
carriage gibs. While they do provide?instructions for?this assembly
and adjustment, adjusting the gibs?is often a process that many people are
unfamiliar with, and so they probably don't get adjusted properly the first time
around. I too rushed through this step with my Micromark 7x16 when I first
assembled it in a hurry to get it up and running. I even completely jumped over
the?step in the instructions which was to install a plastic piece shield to
keep the wiring off of the lead screw.
?
The
compound and cross slide gibs on my machine did not require adjustment out of
the box, but I did have to loosen the carriage gibs in order for it to slide
onto the bed.
?
I
doubt that Micromark goes over each machine when they receive it. Mine appeared
to be in the same box that it left China in.
?
The
only advantages of a Micromark that I can see is the longer 16 inch?bed,
the brushless motor,?the cam lock tailstock, and the "True
Inch"?compound and cross slide screws and dials. Whether or not the quality
of the machine is actually better than any other SIEG lathe is up for debate.
Michael - USA Micro-Mark MicroLux
7x16 ?
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Re: chatter
what bearings did you use ?
thanks,
george
From: Dick To: 7x12minilathe@... Sent: Tue, February 12, 2013 4:29:03 AM Subject: [7x12minilathe] Re: chatter ?
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Re: chatter
not mine. but maybe i'm just to picky. i don't like rough movements and rough finishes
so after seeing one i'm slowly going through it making sure that everything moves smoothly. a little filing and
and adjusting here and there is making it a much better machine.
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george
From: MERTON B BAKER To: 7x12minilathe@... Sent: Tue, February 12, 2013 6:22:43 AM Subject: RE: [7x12minilathe] chatter ? Doesn't the MM catalog tell us that their lathes are carefully gone over and meticulously adjusted before they go out the door? Haven't read their catalog for a couple of years. -----Original Message----- From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of george curtis Sent: Monday, February 11, 2013 10:29 PM To: 7x12minilathe@... Subject: Re: [7x12minilathe] chatter my mm 16 was so loose it near clunked. weather cought up with me so not finished adj with shims. george ---------------------------------------------------------- From: Michael Jablonski To: 7x12minilathe@... Sent: Mon, February 11, 2013 5:31:31 PM Subject: RE: [7x12minilathe] chatter Those set screws with the lock nuts are factory set, which means nothing depending on who set them at the factory. Mine were set correctly so I never needed to adjust them. If when you lift up on the front and rear of the carriage and it does not move, but the carriage can still slide the entire length of the bed freely, then the carriage is probably adjusted correctly. What you did was not a mistake, just a little extra learning experience. Michael - USA Micro-Mark MicroLux 7x16 -----Original Message----- From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of William McBride Sent: Monday, February 11, 2013 5:13 PM To: 7x12minilathe@... Subject: RE: [7x12minilathe] chatter I have already changed the set screws with the lock nuts trying to get down to the 1 mil gap is that .001 inch? I have about .008 gap at front of saddle maybe .005 at back. I gave up spent a few hrs working on it needed to quit for tonight.The saddle moves very nicely seems to have no play haven't tried a cut yet. Did I make a mistake touching the set screws its very frustrating to adjust. Bill |
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Re: chatter
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Re: Hello from Yellowknife
Thanks for that great info Michael. I wasn't aware of all the differences. For me now, it looks like either the LMS 7x12 Deluxe, or the LMS 8.5x16 with 1000W BLDC, dual DROs and power cross feed.
I've gotten so much terrific information from many of you in only the past 18h, it's really great, and much appreciated! --- In 7x12minilathe@..., "Michael Jablonski" wrote: ategory=1271799306> &category=1271799306 > which has many of the newer elements all ready on it such as: |
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Re: chatter
MERTON B BAKER
All true, but I've bought 3 that worked with no problem out of the box from
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3 different resellers, non of which claimed to "check out & adjust" before reselling, as MM does. Merely making an observation. Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of Jerry Durand Sent: Tuesday, February 12, 2013 11:07 AM To: 7x12minilathe@... Subject: Re: [7x12minilathe] chatter Any machine tool needs to be adjusted when installed. The MM might be closer to working out of the box but I would still expect something to get tweaked in shipping. The heavier the machine, the more has to be done to it before you can use it. Things warp and such just moving the machine. A friend makes part of his living fixing brand new cars at car lots before they're sold the first time. So, it's not limited to just machine tools. On 02/12/2013 04:06 AM, MERTON B BAKER wrote: Doesn't the MM catalog tell us that their lathes are carefully gone overand meticulously adjusted before they go out the door? Haven't read their catalog for a couple of years. -- Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand ------------------------------------ Yahoo! Groups Links |
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Re: Hello from Yellowknife
OK, thank you! I agree that it looks very nice.
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--- In 7x12minilathe@..., "Robert Furmanak" wrote:
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Re: Hello from Yellowknife
Hi Michael,
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Thank you for the heads up! I'm located in Montreal, Canada. I have already spoken with LMS about the shipping and brokerage charges. There's not really another option if I want the SC4 though, which I'm leaning towards (unless I missed a Cdn supplier of this unit). We'll see , and I'll post an update. Thanks again! --- In 7x12minilathe@..., "Michael Jablonski" wrote:
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Enco code
Jerry Durand
We love our customers, and want to show our gratitude with an exclusive
customer appreciation offer. From now through Friday 2/15/13, use code: LOVETEN to take an additional 10% off your entire order - No Minimums! No Exclusions! Hurry! Offer ends Friday, 2/15/13. All The Best, The Enco Team -- Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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Re: chatter
Jerry Durand
Any machine tool needs to be adjusted when installed. The MM might be
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closer to working out of the box but I would still expect something to get tweaked in shipping. The heavier the machine, the more has to be done to it before you can use it. Things warp and such just moving the machine. A friend makes part of his living fixing brand new cars at car lots before they're sold the first time. So, it's not limited to just machine tools. On 02/12/2013 04:06 AM, MERTON B BAKER wrote:
Doesn't the MM catalog tell us that their lathes are carefully gone over and meticulously adjusted before they go out the door? Haven't read their catalog for a couple of years. --
Jerry Durand, Durand Interstellar, Inc. www.interstellar.com tel: +1 408 356-3886, USA toll free: 1 866 356-3886 Skype: jerrydurand |
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Re: chatter
Hi Bill,
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I have read what others have said and most of it is good advice. I had the same problem with my MM 7x16. The best thing I have done is to spring for a new pair of tapered roller bearings for the headstock. After changing out the headstock bearings and adjusting them up snug the problem was gone. I did a test cut last week on a piece of a 5/8" reamer shank which is machineable HSS. I chucked the piece in the three jaw chuck , spun it at about 1200 rpm and feeding with the carriage handwheel was able to easily remove .100" per side (.200" on the diameter) with absolutely no chatter. It cut like leaded screw stock. I you do this mod and set the bearings up snug you will see a vast improvement. Dick --- In 7x12minilathe@..., "Bill" wrote:
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Re: chatter
MERTON B BAKER
Doesn't the MM catalog tell us that their lathes are carefully gone over and meticulously adjusted before they go out the door? Haven't read their catalog for a couple of years.
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Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of george curtis Sent: Monday, February 11, 2013 10:29 PM To: 7x12minilathe@... Subject: Re: [7x12minilathe] chatter my mm 16 was so loose it near clunked. weather cought up with me so not finished adj with shims. george ------------------------------------------------------------------------------ From: Michael Jablonski To: 7x12minilathe@... Sent: Mon, February 11, 2013 5:31:31 PM Subject: RE: [7x12minilathe] chatter Those set screws with the lock nuts are factory set, which means nothing depending on who set them at the factory. Mine were set correctly so I never needed to adjust them. If when you lift up on the front and rear of the carriage and it does not move, but the carriage can still slide the entire length of the bed freely, then the carriage is probably adjusted correctly. What you did was not a mistake, just a little extra learning experience. Michael - USA Micro-Mark MicroLux 7x16 -----Original Message----- From: 7x12minilathe@... [mailto:7x12minilathe@...] On Behalf Of William McBride Sent: Monday, February 11, 2013 5:13 PM To: 7x12minilathe@... Subject: RE: [7x12minilathe] chatter I have already changed the set screws with the lock nuts trying to get down to the 1 mil gap is that .001 inch? I have about .008 gap at front of saddle maybe .005 at back. I gave up spent a few hrs working on it needed to quit for tonight.The saddle moves very nicely seems to have no play haven't tried a cut yet. Did I make a mistake touching the set screws its very frustrating to adjust. Bill |
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Re: chatter
MERTON B BAKER
Probably, Bill. The reason the Wright brothers could fly their first
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powered airplane was that, unlike all the other would-be inventors, they were both experienced pilots, with many hours in the air flying similar machines as gliders. Further, they had both cracked up & repaired those machines several times, and knew a lot abut what to do and expect while in the air. I tried this learning method myself when learning to fly, and, just like the Wrights, found it both painful and expensive. I gave it up and took lessons in a machine with dual controls and a licensed IP. Much cheaper, & far safer. More fun, too. Same with lathes, but as you don't have to leave the earth, a lot safer & easier. You should have bought or borrowed, and read, at least 3 books on lathe operation, maintenance and toolmaking before buying a lathe; those I have now take up about 3 feet of shelf space. I had read only one, Igor Bensen's, before trying to learn to fly from the printed page. Others have done it, but I took the easy way out after the first expensive smash from an altitude of 3 feet. Now, about adjusting the gibs on the cross slide: You need a box end wrench to fit the locknuts, and an Allen wrench to fit the little screws. Loosen the locknuts, and all the screws, one turn. You should be able to run the cross slide back & forth the whole way with ease, and be able to wiggle it a bit with hand pressure. Center it on the carriage, tighen a central lock screw until the handwheel turns a bit stiffly, hold the screw STILL! with the Allen wrench, and tighten the locknut. The handwheel should turn now with much less resistance. Tightening the locknut backs the adjusting screw out just the right amount. Try this adjustment method a few times until you are familiar with what to expect, and the handwheel tension is there, but very slight. Gain experience. Run the cross slide back & forth over it's full range to check for uniformity. If all is satisfactory with the one screw adjusted, repeat the process with the others, working from the middle outward, and checking the full travel each time. The top slide is adjusted in the same way. We'll talk about the toolbit next. Mert -----Original Message-----
From: 7x12minilathe@... [mailto:7x12minilathe@...]On Behalf Of Bill Sent: Monday, February 11, 2013 7:29 PM To: 7x12minilathe@... Subject: [7x12minilathe] chatter Hi all I am a newbie , I am having difficulty with chatter even on light cuts. I am trying the tuning method explained in mini-lathe .com. I got a micro mark 7x16 lathe I have done a few light turning with it and went pretty well then I had to do a taper and thats when the problem began. I am having trouble adjusting the saddle mostly when I follow the instructions if I tighten the setscrews the saddle is very hard to move so obviously more than finger tight is too much does that make sense? Also the 1 mil it says to attain gap between ways and saddle would also make the saddle hard to move. I must be doing something wrong? Bill ------------------------------------ Yahoo! Groups Links |
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Opinion of Harbor Freight 8x12 lathe.
bob_guenthner
I've been looking for a mini lathe for a while. I put a wanted add on a local online site. I had a guy say he has the lathe in the subject line. Said he bought it about 8 years ago and hasn't used it much. I haven't looked at it yet, but would like some idea of price.
Any suggestions as to price are appreciated. Bob |
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Re: Ice maiden.
John Lindo
Simon thanks. I've sent Sarah a private e mail. Good luck with your new venture. Take care John L Spain
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Re: chatter
¿ªÔÆÌåÓý?Copper based alloys like brass and bronze require different tool bit geometry than tooling for other metals and plastics. In short, most materials - at least on these small lathes - will like some top/back rake so the sharp edge can slice into the material better, whereas tooling for bronze or brass should have zero back rake, as in flat topped. Brass doesn't slice or curly-Q away in a string like other metals or plastics, it kind of crumbles into a thick brass dust for lack of a better term. Once you see/hear/feel it machining right you will know what I am trying to describe.?I bet if you turn metal or plastic your chatter goes away. But you need a flat topped tool bit, i.e. zero back rake, special just for brass. Its just a whole different animal than steel, aluminum, plastic, etc. Those crappy lathe tools with the soldered on carbide tips generally suck on these little machines because they have no top rake and neither can they hold a sharp edge like HSS can. (Some of them even have a negative rake which only large machines with lots of power and rigidity can get away with using. They are useless on a mini-lathe though.) But with brass those cheap flat topped/zero back rake carbide tipped tools suddenly try to work pretty well. If you have some try one, it will at least work better than any tool designed for steel/aluminum/plastic. Brass/bronze is finicky, if there is any back rake the tool will repeatedly and rapidly dig in and break loose - chatter - and that sounds like what you are running into. Wrong tooling for the material at hand. ?I had a link to a web page that showed the basic turning tool geometries and also showed the flat topped tooling shapes ideal for brass, and so of course I cannot find it now. Hmmm. Hopefully somebody will recall what I am talking about and post a link. (?) ?Cheers, ?John Z., York, Pa. USA. On 2/11/2013 9:11 PM, William McBride wrote: ? |
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Re: chatter
my mm 16 was so loose it near clunked. weather cought up with me so not finished adj with shims.
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george
From: Michael Jablonski To: 7x12minilathe@... Sent: Mon, February 11, 2013 5:31:31 PM Subject: RE: [7x12minilathe] chatter ?
Those set screws with the lock nuts are factory set, which means nothing depending on who set them at the factory.
Mine were set correctly so I never needed to adjust them.
?
If when?you?lift up on the front and rear of the carriage and it does not move, but the carriage can still slide the entire length of the bed freely, then the carriage is probably adjusted correctly.
?
What you did was not a mistake, just a little extra learning experience.
Michael - USA Micro-Mark MicroLux 7x16
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maschwiebert
OldToolmaker
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